Microspec for chromatography

 

(57) Abstract:

Use: in analytical instrumentation, namely the input samples in chromatograph for qualitative and quantitative analysis of multicomponent mixtures of unknown composition in various industries: chemical, oil, petrochemical, nefteperabatyvayuschii industry, metallurgy, biology, ecology, etc. of the invention: simultaneous input into the chromatograph analyzed two different substances microspec contains two capillary, paired with a needle, and a needle valve. The source gas carrier is connected to the fitting. Needle injected into the chromatograph evaporator and briefly opens a needle valve. When this gas medium under pressure squeezes of the two capillaries were selected for analysis of a substance in the evaporator chromatograph. Then the carrier gas is shut off from the connection and connect again to the evaporator chromatograph. 1 Il.

The invention relates to analytical instrumentation, namely the input samples into the chromatograph, and can be used for qualitative and quantitative analysis of multicomponent mixtures of unknown composition in various sectors of the economy: hee etc.

A device for introducing liquid samples of small volume in a gas chromatograph with a glass capillary column using a micropipette. The introduction of a length of 6-8 cm is made of a glass capillary and mounted between the source of carrier gas and column. With column the introduction connected back to back with the connecting tubes of Teflon. The set of samples in the micropipette is due to capillary forces [1]

It is also known device for introducing the sample into the chromatograph, containing the intermediate chamber, in which is placed the capillary with the sample. The chamber is connected to the container with the carrier gas through a special valve. Turn the faucet connecting the intermediate chamber with the carrier gas and introducing the sample in the form of narrow strips [2]

However, the known devices do not provide simultaneous input into the chromatograph two specific volume samples of various liquids.

Closest to the invention to the technical essence is a syringe comprising a housing made in the form of a cylinder with side cut outs from two opposite sides, glass measuring cylinder mounted in the casing through the side openings, the upper and lower PTFE couplings for Hermetists the hollow needle [3]

The syringe allows you to enter only one sample analyzed mixture. It is necessary to find the substance-standard, well-soluble in the analyzed mixture, considering the standard of the analyzed mixture and the mixture added standard, and then only enter the analyzed sample, which leads to a significant increase in time and effort to conduct qualitative and quantitative analysis.

The objective of the invention is to reduce labor costs and time to conduct qualitative and quantitative analysis.

This problem is solved due to the fact that microspace for chromatography, containing a cylindrical housing with side cut outs from two opposite sides, measuring cylinder installed inside the enclosure, with two sealing couplings, needle holder with a hollow needle mounted on one end of the housing in contact with the measuring cylinder and the displacer sample mounted on the other end of the housing, the measuring cylinder is made in the form of a bolt with an axial and lateral channels, connected to each other inside it, and in the axial channel running one of the sealing couplings measuring cylinder and a needle valve, and the side channel is equipped with the hand the second is the simultaneous input and the subsequent joint analysis on the chromatograph of a certain number of two different samples.

The invention is illustrated in the drawing.

Microspec includes a housing 1 with side cut outs from two opposite sides, a removable capillary 2 and 3, connected back to back with the bore of the coupling 4 and the clamp 5, the top 6 and bottom 7 of the coupling, made of PTFE, for sealing the removable capillary special bolt 8 with axial and lateral channels, connected to each other inside it. In the axial channel of the bolt 8 is installed needle valve 9, the upper bore of the sleeve 6 and the retaining ring 10. Side channel of the bolt 8 is connected to the fitting 11 to connect the carrier gas. Needle valve 9 is sealed Salnikov seal made of PTFE rings 12 which are pressed to contact with the nut 13. The syringe also includes a needle holder 14 with a hollow needle 15.

Microspec works as follows.

For a set of analyzed samples capillaries 2 and 3 removed from the housing 1 through the side openings, the bolt 8 Unscrew the ring a few times, weaken the degree of roasting of the clamp 5 and the capillary 2 and 3 are removed from the Teflon clutch 4. Then in each capillary due to capillary forces select two different substances for the joint analysis. After this, the capillary 2 and 3 is placed again in the clutch 4, omputer screwing of the bolt 8.

For simultaneous entry into the chromatograph analyzed two different substances, selected in the capillaries 2 and 3, close the needle valve 9, the carrier gas is shut off from the evaporator chromatograph and connect to the fitting 11, the needle 15 is injected into the chromatograph evaporator and briefly open the needle valve 9. While the carrier gas under pressure is pushed out of the capillaries 2 and 3 were selected for analysis of a substance in the evaporator chromatograph. Then the carrier gas is disconnected from the fitting 11 and is connected again to the evaporator chromatograph. The needle 15 is removed from the evaporator, and microspec prepare to set in the removable capillary 2 and 3 the following samples of the analyzed substances.

The use of the invention can significantly reduce the time and effort required to conduct qualitative and quantitative analysis, as through the use of individual capillaries analyzed for two different substances, there is no need in the selection of an acceptable standard substances, soluble in the source of the analyzed mixture, and mix with added internal standard prior to analysis, to determine the time rezorbiruetsa component when working with a flame ionization detector, for which dipolar, to improve the reproducibility of the quantity introduced into the chromatograph substances for analysis (not less than 1-2%) due to execution of a dosing volume in the form of segments of capillaries.

MICROSPEC FOR CHROMATOGRAPHY, containing a cylindrical housing with side cut outs from two opposite sides, measuring cylinder, mounted in the housing with two sealing couplings, needle holder with a hollow needle mounted on one end of the housing in contact with the measuring cylinder and the displacer sample mounted on the other end of the housing, characterized in that the measuring cylinder is made of two capillaries, hermetically joined back to back with the third clutch and clamp, and propellant samples in the form of a bolt with an axial and lateral channels, connected to each other inside it, moreover, in the axial channel running one of the sealing couplings measuring cylinder and a needle valve, and the side channel is equipped with a fitting for the carrier gas.

 

Same patents:

Chromatograph // 2054669
The invention relates to gas chromatography and can be used for quantitative determination (certification) of the individual components of multicomponent mixtures of arbitrary composition

The invention relates to chromatography and can be used to identify individual compounds or individual components of complex mixtures in various industries: chemical, oil, gas, petrochemical, metallurgy, medicine, biology, ecology, etc

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

FIELD: physics.

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

FIELD: physics.

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

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