(57) Abstract:Use: in analytical techniques, in particular in the chromatograph for quantitative analysis of individual components of different mixtures in different industries - chemical, gas, petrochemical, metallurgical, medical, biological and other inventive chromatograph includes a source of carrier gas, three dosing with dosing volumes, the first column, the flow divider, the detector, the second column with a concentration detector output and the third dosing with dosing volume at the entrance. There are also cumulative column for the designated components of the device maintain the desired temperature desorption, United switch gas flows from the outlet of the first column and dosing volumes respectively of the second and third or the third and fourth dispensers through additional gas valve. Chromatograph provides a separate source components of the analyzed mixture and putting two of them in mixture with carrier gas in the separation column simultaneously with the starting mixture for the joint analysis. In this case, provided the reduction of labor costs and time when the appreciation is giving relates to gas chromatography and can be used for quantitative determination (certification) of the individual components of multicomponent mixtures of arbitrary composition.Known chromatograph containing connected in series to the source of carrier gas, the first and second dispensers, the separation column, a detector, a third dispenser connected to a source of carrier gas, switch gas streams and several on the number of defined components of the cumulative columns, provided with a device for maintaining the temperature of desorption, are parallel to each other and connected by inputs and outputs through the switch of gas flows from the metering volume of the second dispenser. Chromatograph provides the selection of the individual components of the analyzed mixture and putting one of them in mixture with the gas propellant is used in the separation column together with the analyzed source mix for re-analysis. The concentration of the component is determined using the additive according to the results of three chromatographic analyses.However, the known chromatograph, working only with the concentration detector has limited analytical capabilities and requires considerable time and increased labor costs to determine the concentrations of the individual components of the analyzed mixture (three analysis to determine the content of each component, not counting the pre-anal is ograph has a relatively low accuracy of determination of the concentrations of the components of the mixture by increasing the random components of error when changing the parameters of the chromatographic process in time in a period of three cycles of analysis.Closest to the invention by the technical nature of a chromatograph, containing connected in series to the source of carrier gas, the first and second dispensers are connected to the line of the original mixture, the third dispenser, the first separation column with a flow divider, a differential detector, which can be applied not only concentration, but also streaming destructive detectors. The output of the separation column via switch gas flows simultaneously connected with the corresponding defined component of the cumulative column and the second and third dispensers. Cumulative speakers have a device for maintaining a predetermined temperature desorption and filled with sorbent. The entrance to the third dispenser is connected to the source line of the analyzed mixture, and exit through the second separation column and the flow divider with a concentration detector. The concentration of the analyzed component in the original mixture is determined using the additive according to the results of three chromatographic analyses: analysis of the initial mixture, the analysis of the initial mixture with the additive binary mixtures-defined component carrier gas, the analysis of the initial mixture with the additive binary mixtures opredelyayutsya increase in time and labor required for the determination of concentrations of components of the analyzed mixture, the decrease in accuracy by increasing the random component of the error when changing the parameters of the chromatographic process in a period of three cycles of analyses, and that the chromatograph is not possible to fully realize the information potential of the chromatographic analysis, such as those associated with the use of interpolation methods for quantitative analysis when determining components suiryudan respectively before and after the two components known content.The objective of the invention is to improve the accuracy of determining the concentration of components in the application of interpolation methods for quantitative analysis, as well as reducing labor costs and time to quantify the individual components of multicomponent mixtures of arbitrary composition.This is solved due to the fact that in the chromatograph containing a source of carrier gas, the first and second dispensers are connected to the line of the original mixture, the third dispenser, the first separation column with a flow divider mounted on its output, which is connected simultaneously with the first detector with the comparative and the measuring chamber, and through switch gas flow temperature desorption and connected via switch gas flows from the metering volumes of the second and third dispensers, the second separation column with a concentration detector having comparative and measuring chamber at its outlet, and the second dispenser at its input, according to the invention introduced a fourth dispenser installed in series with the first and third dispensers and dosing volumes of the second and fourth dispensers are connected in series, and the output switch gas flows connected with dosing volumes respectively of the third and second or the fourth and second dispensers are introduced through the gas valve, and the line original mix connected via a flow divider with comparative camera concentration detector.This allows you to determine concentrations of components with greater accuracy interpolation using the dual additive (similar to the dual internal standard). When this occurs, the cross-correlation between the errors of the measured chromatographic values of the analyzed components that are shared during one cycle analysis. It is known that errors are not correlated, if measurements are performed as a result of several cycles of analysis, for example, as known in the chromatograph, the method of single supplements consistently for two separate compo the house.The invention is illustrated in the drawing.Chromatograph contains source 1 carrier gas, the first dispenser with 2 dosing volume V1the second dispenser with 3 dosing volume V2the third dispenser with 4 dosing volume V3, the separation column 5, an adjustable throttle 6, the divider 7 flow, differential detector 8, which can be used destructively or selective detectors, fourth dispenser 9 dosing volume V4the switch 10 gas flows, the cumulative column 11, the device 12 to maintain a predetermined temperature desorption, separation column 13, the divider 14 flow, concentration differential detector 15, an adjustable throttle 16 and the additional gas valve 17.The divider 7 flow divider 14 flow consist of two permanent chokes different resistance. Chokes a large resistance connected respectively through adjustable throttles 6 and 16 with source 1 carrier gas and the source line of the analyzed mixture for alignment of gas consumption in both cells of the detectors 8 and 15.Chromatograph operates as follows.The initial mixture with a sample volume of V1the dosing device 2 enters p is between the corresponding cumulative column 11 through the switch 10, the gas flows through the divider 7 flow in both cell differential detector 8. Measured by the detector difference signal S proportional to the difference of the concentrations of the component to be determined in the cells of the detector and its quantity in the original mixture, which excludes the impact of systematic error due to the presence of the initial factor in the equation of the calibration characteristics of the chromatograph.After several tests the initial mixture adsorbed in the cumulative columns 11 components alternately desorbers for the joint analysis with the original mixture. This enables the device 12 to maintain the temperature of desorption. One of the defined components desorbed from the corresponding cumulative column in a mixture with a carrier gas, is fed through an optional gas valve 17 in the dosing volume V2and V4the second and fourth dispensers. The binary mixture of the first component to be determined (volume dose V4) dosed in second separation column 13, purged of the original mixture. The detector 15 registers the change in the concentration of the carrier gas method acanthamoebae. After this additional gas valve 17 switches and the second detectable component desorbed from the appropriate macheteros dispensers. Then at the entrance of the separating column 5 are dosed simultaneously the initial mixture volume V1and a binary mixture of two defined components with the carrier gas V2and V3. In addition, the binary mixture of the second component to be determined by the volume V4dosed in second column 13.The concentration of the two components in the original mixture is determined by the results of three chromatographic analyses using the dual additive.The analysis of the original mixture. Dose V1the initial mixture. Dose V2V3and V4pure carrier gas.Analysis of binary mixture of the first component to be determined with the carrier gas. Dose V4.Analysis of the initial mixture with the additive binary mixtures of the first and second defined components. Dose V1the initial mixture. Dose V2the binary mixture of the first component to be determined. Dose V3and V4the binary mixture of the second component to be determined.The normalized system of equations for calculation of the concentrations of the designated components in the original mixture is
C -1 + 1, where C1=
C -1 + 1, where C12=
C1i= S1iV1< / BR>or
S12/nS22/nand S32/nchromatographic signals (vacancy) carrier gas in the first, second and third tests (dose V4detector 15); Si1, S11, S21,S13S23chromatographic signals of the i-th component and two components in the first and third tests (dose V1V2and V3detector 8).The use of the invention can significantly reduce the time and effort required to conduct quantitative determination (certification) of the individual components of multicomponent mixtures of arbitrary composition, as through the application of the fourth dosing with dosing volume V4and more of the gas valve at the output of the switch gas flows is provided by the determination of the concentrations of the analyzed components of the original mixture interpolation using the dual additive, it reduces the total number of tests for the quantitative determination of three components enough to hold all three analysis; to improve the accuracy of quantitative determination is elizerbeth components, shared during one cycle analysis when the interpolation method dual additive; to determine the retention time of rezorbiruetsa component when working with a flame ionization detector, which is one of the dosing volume (V2or V3) fills this component for the joint analysis with the original mixture (dose V1). CHROMATOGRAPH containing a source of carrier gas, the first and second dispensers are connected to the line of the original mixture, the third dispenser, the first separation column with a flow divider mounted on its output, which is connected simultaneously with the first detector with the comparative and the measuring chamber, and through switch gas flows from the cumulative columns defined components, provided with a device for maintaining a predetermined temperature desorption and connected via switch gas flows from the metering volumes of the second and third dispensers, the second separation column with a concentration detector, having comparative and measuring chamber on its output and the second dispenser at its input, characterized in that it has a fourth dispenser installed in series with the first and third Donatos gas flows connected with dosing volumes respectively of the third and second or the fourth and second dispensers are additionally introduced through the gas valve, and the line original mix connected via a flow divider with comparative Luggage concentration detector.
FIELD: chemical technology.
SUBSTANCE: invention relates to a method for synthesis of ester perfluorinated derivative by using a chemical reaction. This reaction represents the fluorination reaction of the parent compound as a raw, the reaction of chemical conversion of fragment of ester perfluorinated derivative to yield another ester perfluorinated derivative or the interaction reaction of carboxylic acid with alcohol under condition that at least one or reagent, i. e. carboxylic acid or alcohol, represents a perfluorinated compound wherein indicated perfluorinated derivative of ester represents a compound comprising a fragment of the formula (1):
with a boiling point 400°C, not above. The reaction time for carrying out abovementioned chemical reaction is sufficient to provide the required yield of ester perfluorinated derivative and wherein this yield of ester perfluorinated compound is determined by the gas chromatography method by using a nonpolar column. Also, invention relates to a method for pyrolysis of ester perfluorinated derivative with a boiling point 400°C, not above, to yield the dissociation product wherein this product represents a derivative of acyl fluoride or ketone and wherein pyrolysis time is sufficient to provide the required degree of conversion of ester perfluorinated derivative and wherein the indicated conversion degree of ester perfluorinated derivative is determined by gas chromatography method by using a nonpolar column. Also, invention relates to a method for analysis of ester perfluorinated derivative with a boiling point 400°C, not above, that involves analysis of ester perfluorinated derivative in a sample containing ester perfluorinated derivative by gas chromatography method by using a nonpolar column wherein ester perfluorinated derivative represents compound comprising a fragment of above given formula (1).
EFFECT: improved method of synthesis.
8 cl, 1 dwg, 2 ex
FIELD: instrument engineering.
SUBSTANCE: device for generating flow of vapor-gas mixture with preset concentration of vapor has vessel partially filled with fluid, second vessel provided with branch pipes for supply and removal of gas, and vapors of fluid pipeline-leak. One of vessels is connected with gas discharge forcer; fluid vapors pipeline-leak connects both vessels. Vessel, partially filled with fluid, is mounted inside second vessel. Pipeline-line, connecting both vessels, is totally placed inside second vessel. Device is also provided with additional discharge forcer for adjusting concentration of fluid vapor in second vessel. Granulated filler is introduced into vessel partially filled with fluid. Device is also provided with gas analyzer for providing gas concentration in space of second vessel.
EFFECT: higher precision of keeping of preset concentration of vapor; improved efficiency of vapor concentration control and adjustment.
FIELD: instrument engineering.
SUBSTANCE: invention is designed for calibrating gas analyser detectors, according to which there prepared is calibration substance solution with concentration A=By/k (%) as per Henry constant value k (mg/m %) at calibration temperature and as per the specified value of calibration substance mass concentration in calibration steam/gas mixture By (mg/m). After the solution has been introduced into the vessel in quantity enough for fully saturated equilibrium calibration steam/gas mixture to appear above the solution surface, the sensor calibration is carried out by means of mixture; at that, mixture concentration is changed by means of direct proportional change of solution concentration by diluting concentrated reference solution of calibration substance with analytical accuracy up to the specified concentration value A (%). There also proposed is the device for realising this method, which includes a solution point for preparing calibration solution with analytical accuracy, vessel with thermostatic device for obtaining steam/gas mixture with constant concentration corresponding to Henry law; at that, solution point includes graduated dose metre, graduated diluter, mixer with a reducer, capacity with solvent, and reference container with reference solution, which is stabilised with a gate valve meant for multiple use of container, and vessel with thermostatic device consists of thermometre and heat-insulating cover plate with an inlet branch pipe containing a normally closed return valve and a pusher for valve opening.
EFFECT: decrease of calibration substance losses; accuracy and reproducibility of metrological performance, and meeting requirements of industrial and ecological safety.
6 cl, 2 dwg
SUBSTANCE: vapour-gas mixture source has a mixer which has connecting pieces for inlet and outlet of the vapour-gas mixture. The vapour-gas mixture source also has a diffusion pipe filled with working fluid and an auxiliary pipe designed for filling the diffusion pipe with working fluid. Part of the diffusion pipe is filled with substance which retains the working fluid. The level of working fluid in the auxiliary pipe is lower than the level of substance in the diffusion pipe. The substance which retains the working fluid used can be sand, granular material with particle size between 10 and 10000 mcm, porous substances, e.g. ceramic metal etc.
EFFECT: more accurate measurement and maintenance of concentration of the vapour-gas mixture coming out of the source, provision for constant diffusion flow of vapour of working fluid into the mixer.
11 cl, 2 dwg
SUBSTANCE: invention relates to laboratory methods of analysis and deals with method of quantitative determination of manganese, lead and nickel in bile by method of atomic-absorption analysis with atomisation in flame. Essence of method lies in the following: sampling of bile is carried out during duodenal probing, after that it is frozen, and unfrozen at room temperature, homogenisation of bile by mixing being performed already at partial soft unfreezing. After that, sampling of homogenised bile is carried out for preparation for analysis, concentrated nitric acid is introduced into it with volume ratio 1:1, mixture is kept at room temperature, then heated and further mixture is kept for not less than 2.5 hours at room temperature. In order to obtain analyte, to obtained mixture added is concentrated hydrogen peroxide in volume ratio 1:1 to volume of bile sample volume, analyte is heated, after that cooled to room temperature. After that by method of atomic-absorption spectrometry, using graduated diagram, quantitative content of particular type of metal: manganese, lead and nickel is determined in analyte.
EFFECT: invention allows increasing accuracy of quantitative determination of manganese, lead and nickel in bile.
FIELD: engines and pumps.
SUBSTANCE: proposed method is based on application of simplified model of intake of admixtures into cabin which allows for only oil decomposition products in gas turbine engine. Major portion of air samples, 95-97%, required for identification and quantitative determination of oil decomposition products, is sampled on surface from device simulating oil decomposition conditions including air temperature and pressure at point of sampling from engine compressor, and oil stay time in hot zone.
EFFECT: decreased time of in-flight experiments and that of surface analysis of samples.
1 cl, 1 ex, 1 tbl, 1 dwg
SUBSTANCE: invention relates to analytical chemistry, particularly to methods of determining benzoic acid, and describes a method for quantitative determination of benzoic acid from a methyl derivative thereof - methyl ether in aqueous matrices with determination sensitivity of 5.0·10-5 mg/cm3 with determination error of not more than 25%. The method is characterised by that quantitative determination of benzoic acid is carried out using a chromatographic method with flame-ionisation detection and includes the following steps: extraction concentration of an analyte with benzene in water samples acidified with 25% sulphuric acid solution to pH 1-3 while adding sodium chloride until a saturated solution is obtained, conducting a benzoic acid methylation reaction with diazomethane to obtain a derivative - methyl ether of benzoic acid and determining the formed methyl ether of benzoic acid by a chromatographic method with flame-ionisation detection.
EFFECT: method provides high sensitivity, selectivity and easy implementation during quantitative determination of benzoic acid in aqueous media and enables use thereof in practice in factory analytical laboratories, central laboratories of chemical companies and chemical-toxicology laboratories.
1 ex, 3 tbl
SUBSTANCE: device for preparing control gas mixtures comprises a gas mixer, at least one channel for supplying target gas to the gas mixer, at least two channels for supplying the diluent gas to the gas mixer, and the channel for output of the gas mixture from the gas mixer. And in each channel for supplying gas to the gas mixer the mass flow controller of gas and a solenoid valve are mounted successively, at least in one channel for supplying the diluent gas to the gas mixer the gas humidifier and the solenoid valve are mounted successively. In each of the channels equipped with the gas humidifier at least one bypass pipeline with the additional solenoid valve is mounted. and the output of the gas flow controller of this channel is connected to the input of the additional pipeline which output is connected to the output of the last solenoid valve, and at the input of the target gas and the input of the diluent gas at least one filter is mounted, which outputs are connected to the inputs of manually operated valves.
EFFECT: possibility of operational automated obtaining the dry or moist gas mixture, and reliable obtaining of the given values of concentrations of gas mixtures at the output of the device.
SUBSTANCE: each blood sample is analysed twice. A fresh blood sample is centrifuged at 2,000 rpm for 5 min. The samples are separated in plasma fractions and formed elements. A solid-phase plasma extraction is performed by sequential passing of 100% acetonitrile, plasma, distilled water, 50% acetonitrile solution under vacuum through a cartridge with Oasis HLB 3 cc sorbent. The cartridge with the sorbent is dried under vacuum, and 100% methylene chloride is passed through the sorbent. An aliquot portion of the produced extract is chromatographed. Producing the extract of formed elements is ensured by dispersed solid-phase extraction: by adding 100% acetonitrile thereto and agitating intensively. That is followed by adding a number of QuECHeRS salts for extraction, agitating, centrifuging for 10 minutes at 2,000 rpm; that is accompanying by forming 3 layers; an upper layer is transferred to another test tube, which contains a number of QuECHeRS salts for purification; the layers are centrifuged at 2,000 rpm; the upper layer is sampled. Plasma and formed elements extracts are analysed by Agilent 1200 liquid chromatograph with a fluorimetric detector on Zorbax column 50 mm long and having an inner diameter of 4.6 mm with Eclipse PAH C18 sorbent at column temperature 27°C; a movable phase is presented by mixed acetonitrile and water at flow rate 1.5 cm3/min and optimising elution in the gradient mode (supplying the movable phase of 60 vl % to 68 vl % of acetonitrile for 1 min, increasing 60 vl % to 68 vl % of acetonitrile for 3 min, increasing 68 vl % to 70 vl % for 0.5 min, increasing acetonitrile 70 vl % to 90 vl % for 1.5 min, increasing acetonitrile 90 vl % to 100 vl % for 4.5 min, supplying 100% acetonitrile for 1.5 min, reducing acetonitrile to 60 vl % and supplying 60% acetonitrile for 4 min to balance the column). An excitation wavelength of the fluorimetric detector makes 265 nm, and an emission wavelength makes 412 nm. A calibration chart is used to quantify benz(a)pyrene in plasma and formed elements separately, while the results are summed up.
EFFECT: invention provides high sensitivity of the method and ensures selectivity in a combination with its accessibility for routine analyses.
3 cl, 6 tbl, 1 ex
SUBSTANCE: invention relates to medicine, namely to experimental pharmacology, and can be used for quantitative determination of carnosine in tissues and physiological liquids. Determination of carnosine in biological materials is carried out by highly-selective mass spectrometry method using electrospray ionization. At that, deproteinization of blood plasma should be preliminary carried out using 10 % aqueous solution of trichloroacetic acid. Then aliquot of internal standard solution of L-alanyl-carnosine is added to deproteinizated sample. And separation of extraction products is performed at reversed-phase chromatographic column 4.6×150 mm with temperature separation of 35 °C and eluent feed rate 0.7 ml/min. Used eluent is 10 mM ammonium acetate, acidified with glacial acetic acid to pH 3.7, and mixture of acetonitrile with 10 mM ammonium acetate in ratio of 90:10, taken in ratio of 10:90, respectively. Detection of carnosine is carried out by four child ions with m/z 110.0, 156.1, 180.0, 210.1, formed as result of molecular ion carnosine disintegration with m/z 227.1. Concentration of carnosine is calculated by chromatographic peak carnosine area relation to L-alanyl-carnosine internal standard peak area.
EFFECT: invention provides highly selective and sensitive gas chromatography/mass-spectrometric method for quantitative determination of carnosine in biological substrates.
1 cl, 6 dwg, 2 tbl, 1 ex
FIELD: physics; measurement.
SUBSTANCE: invention pertains to gas chromatographic analysis methods. A sample of natural gas is preselected. Impurities are concentrated on an absorbing sorbent and thermal desorption of the impurities into a chromatographic column is done. Preselection of the sample of natural gas is done by concentrating impurities of natural gas in a sorbent tube with activated silica gel KCK and valves. The sorbent tube is put into a heated thermal desorption unit with needles, through which the valves in the sorbent tube open, and desorbed impurities are eluated into the chromatographic column. The proposed method is realised using a chromatographic system of determining mass concentration of impurities in natural gas, consisting of gas chromatography, a chromatographic packed column, 10 dock crane-switches, evaporator, detector, aspirator and a sampling device. The sampling device contains a reservoir where the sorbent tube with valves is put at its ends and activated silica gel KCK. The device is provided with two needles, through which valves of the sorbent tube open when taking samples. The thermal desorption unit has two needles, through which valves of the sorbent tube open during analysis.
EFFECT: increased accuracy, as well as possibility of gas chromatographic determination of mass concentration of moisture and methanol impurities in natural gas.
8 cl, 5 dwg
FIELD: instrument making.
SUBSTANCE: method for increasing concentration of impurities separated from gas mixture can have a wide range of application, and namely in those cases when pulse and dynamic-in-time increase of concentration of the selected substance is required, which is enough for making measurements. The proposed method can be used for analysis of the air breathed by patients for purposes of diagnostics of latent diseases at initial stage. Besides, the above method, when combined with a mass spectrometer or any other analytical instrument, a sensor or a detector, can be used for creation of selective and extremely sensitive analysers in order to determine noxious or explosive substances in air, for detection of drugs, for determination of mercury vapours, methane traces, low concentrations of dioxine, etc., which are present in atmosphere. The method contains a reserve capacity with structural elements located inside it. Gas with impurity that is adsorbed on the reserve capacity surface and on surfaces of structural elements inside it is pumped through the reserve capacity. In order to increase peak concentration of desorbed impurities and reduction of their losses, desorption of accumulated impurities is performed as a result of irradiation of inner surface of the reserve capacity and surfaces of structural elements located inside the reserve capacity and contacting the gas mixture.
EFFECT: abrupt increase of concentration of adsorbed substance by increasing the amount of accumulated substance on maximum large surface with its further desorption to volume of minimum dimensions.
SUBSTANCE: invention relates to an apparatus for preparing samples and analysing pesticides in samples using chromatography. The apparatus (10) for preparing samples and analysing pesticides in samples includes a column (14) for hydrophilic chromatography having a first pump (12) for a solvent with primarily low content of water and/or non-polar solvent. The apparatus also includes an enrichment apparatus (22) with solid-phase extraction, a second chromatographic column (28) with a second pump (18) for a solvent with primarily high content of water and/or polar solvent, and a detector (32). The apparatus also includes a valve unit (20, 24) for controlling sample and matrix streams, configured such that the sample stream in a first switching position of the valve unit is fed from the column (14) for hydrophilic chromatography to the enrichment apparatus (22) with solid-phase extraction, and in a second switching position, the sample enriched in the enrichment apparatus (22) with solid-phase extraction, is fed in the reverse direction from the enrichment apparatus (22) with solid-phase extraction through a second chromatographic column (28) to the detector (32).
EFFECT: improved reliability of results, reduced power costs and material consumption.
12 cl, 2 dwg
FIELD: investigating or analyzing materials.
SUBSTANCE: method comprises supplying of batched volumes of oil sample, standard material for comparison, and n-heptane by displacing them by the gas flow to the capillary column for chromatography. The pressure in the gas flow is higher than that at the inlet of the column. The device comprises batching cock, check valve in the gas line, and resistance in the line for discharging the gas. The valving members are made of pipes with plugs at the center and are interconnected through a gas cross-piece and vessel for batching the gas.
EFFECT: enhanced accuracy of determining hydrocarbons.
2 cl, 1 dwg, 1 tbl
SUBSTANCE: proposed device comprises unit of carrier gas preparation, sample feed assembly, two chromatographic columns, DC source, detector and results processing system, all said units being connected in series. Note here that one of the columns is connected with sample feed assembly, while the other one is connected with detector. Note also that second column is mounted between two flat parallel electrodes connected to DC source.
EFFECT: higher efficiency and selectivity.
1 tbl, 1 dwg
SUBSTANCE: planar microdoser for gas chromatography is performed on a flat aluminium plate, on the surface of which the channels for gas flow and the fixed volume dose are manufactured by microfilling. The plate is also fitted with three electrically operated pneumatic distributor 3/2, channel sealing flat glass provided with an adhesive. Furthermore, planar microdoser comprises a pneumatic pressure repeater in the carrier gas and sample gas lines.
EFFECT: increase precision is introduced for analysis of small sample volumes, providing direct input test sample splitless in the capillary, and in micro-settling exclusion column and gas pressure surge at the time of sample introduction.
2 cl, 1 dwg, 1 tbl