Gas chromatograph for analysis of atmospheric carbon dioxide
(57) Abstract:Usage: in measurement technology, in particular in chromatograph for analysis of the concentration gradient of carbon dioxide in the atmosphere. The inventive chromatograph has two block sampling and dosing, consistently placed through the delay unit. Both unit selection and dosing have two gas lines and to both blocks are connected to the outputs of the control unit. 1 Il. The invention relates to the control of the natural environment, namely gas chromatography analyzers atmospheric carbon dioxide, and is intended to measure the gradient of carbon dioxide in the atmosphere.Known gas chromatographs for analysis of atmospheric carbon dioxide, containing a block of casinosites, block of input samples, chromatographic column and thermal conductivity detector.To the disadvantage of the known gas chromatographs is that in the analysis of carbon dioxide, selected from two points of space, for example in the measurement of the gradient of the concentration of CO2is selected a sample first from one point and its analysis, and then from another point and its analysis, which reduces the accuracy gra analysis of atmospheric carbon dioxide, containing serially connected blocks of casinosites, block of input samples, the separation column and thermal conductivity detector.The aim of the invention is to improve the measurement accuracy of the concentration gradient of carbon dioxide by simultaneous sampling of air for analysis from two points of space and analysis of two samples.This is achieved by the fact that the gas chromatograph for analysis of the atmospheric carbon dioxide that contains one United block of casinosites, block of input samples, the separation column and thermal conductivity detector equipped with successive delay block and the second block sampling, connected between the first block of input samples and the separation column, and a control unit, the output of which is connected to both blocks of input samples.The drawing shows a structural diagram of a gas chromatograph. It contains serially connected unit 1 casinosites, the first block 2 input sample block 3 delay, the second block 4 input samples, the separation column 5, the detector 6. To blocks of input samples is connected to the output unit 7 controls and gas communication 8 connecting points on the body 1 generates the gas pressure, for example helium in the gas path of the chromatograph. Analyzed air gas communications 8 of the sampling points is served in a dosing volume of blocks of input samples. After actuation unit 7 control samples analyzed air from the metering volumes simultaneously fall into the gas path of a chromatograph. First is divided into the separation column 5 CO2from the metering volume of the block 4 input samples and analyzed by the detector 6 thermal conductivity. Then after passing through the block 3 delay similarly divided and analyzed CO2from the metering volume of the block 2 input samples.Simultaneous sampling, enter them in the gas passage and analysis in one cycle of measurement increases the accuracy of measurement of the concentrations of CO2in the samples and the definition of the gradient of the CO2between sampling points. GAS CHROMATOGRAPH FOR ANALYSIS of ATMOSPHERIC CARBON DIOXIDE containing consistently located block carrier gas, the unit selection and input of the sample and connected to a gas communication and connected to the control unit, the separation column and the detector in thermal conductivity, characterized in that, in order to increase the measurement accuracy of the concentration gradient dioxide ueob gas communication installed in the gas passage chromatograph between the first block of input samples and the separation column, an additional block of input samples is also connected to the control unit.
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