(1) Analysis of trace carbon oxides in the atmosphere. Carbon monoxide is contained in the exhaust gas of automobiles. Incomplete combustion of industrial boilers and household coal stoves emits carbon monoxide, which pollutes the environment. The trace carbon monoxide in the atmosphere is usually determined by the conversion method. Use a reformer unit to convert CO to CH4.
CO + 3H2Ni catalysis / 380 ℃ → CH4 + H2O
5A sieve molecules, GDX-104, Porpak Q, etc. can be used as the stationary phase of the column.
Take molecular sieve as an example:
Chromatography column packing: 13X or 5A molecular sieve 60 ~ 80 mesh (first activated by 500 ~ 550 ℃ for 2 hours);
Chromatography column: stainless steel column, 2m, inner diameter 2mm;
Detector: hydrogen flame detector;
Flow conditions: 57ml / nin with hydrogen carrier gas; 400ml / min with air; 80ml / min with makeup nitrogen.
Temperature setting: column temperature 36 ℃, detection room 130 ℃, reformer 380v;
Injection volume: 1mm.
The above settings can measure ppm carbon monoxide in the atmosphere.
⑵Analysis of benzene series in air Chromatography column packing: 10% PEG20M / 101 white support 60 ~ 80 mesh
Chromatography column: stainless steel column, 2m, inner diameter 3mm;
Detector: hydrogen flame detector;
Flow conditions: carrier gas nitrogen flow rate 60ml / min; 57ml / nin; hydrogen 35ml / min, air 400ml / min;
Temperature setting: column temperature 120 ℃, vaporization chamber 150 ℃, detection chamber 150 ℃;
Injection volume: 1mm.
The above conditions are good for the separation of benzene, toluene and xylene.
Non-polar columns such as aspirin or squalane can also be used. If the three isomers of p-xylene are to be completely separated, the mixed fixative solution of organic bentonite and dinonyl phthalate can be applied to the 6201 support, or the mixed fixative solution of organic bentonite and diglycerin can be used. Get a good separation.
6201 is an adsorbent, the adsorption temperature is -78 ℃, the desorption temperature is 100 ℃, the concentration is 100 times, the recovery rate is 100%, the chromatographic column is 40% N, N-bis 9_cyanoethyl) formamide / 6201, 80 ~ 100 mesh, A hydrogen flame detector with a column temperature of 100 ° C and a benzene minimum of 5ppb.
(3) Analysis of organic halides in water After chlorination of tap water, organic halides such as chloroform, carbon tetrachloride, and 1,2-dichloroethane are produced. Chloroform has been used for monitoring abroad. Chloroform is a volatile liquid, which can be analyzed by headspace gas chromatography, and the gas phase in equilibrium with the sample is used for analysis.
Chromatography column packing: filled with 25% PEG6000 + 0 / 5DC-200 / Chromosorb W60 ~ 80 mesh, according to 1: 1 stage packing;
Chromatography column: stainless steel column, 2m, inner diameter 3mm;
Detector: electronic capture detector;
Flow conditions:
High-purity nitrogen is carrier gas 35ml / min; 57ml / nin; hydrogen 35ml / min, air 400ml / min;
Temperature setting: column temperature 102 ℃, vaporization and detection 250 ℃,
Injection volume: 1mm.
Above conditions, air, carbon tetrachloride and chloroform are well separated.
Note: The above conditions have not been confirmed, and Wotech is not responsible for its effectiveness.
Shanghai Hegong Scientific Instrument Co., Ltd. Room 2312, Building B, Oasis Plaza, 3064 North Zhongshan Road, Shanghai 200063
Phone 51602156 51602157
Fax URL:
This article comes from the application of gas chromatography in environmental science | Scientific Instrument Online Original Link: http: //
Leveler Feet,Adjustable Feet,Furniture Levelers,Adjustable Furniture Feet
Cixi Ruixin Machine Components Co., Ltd , https://www.adjustlevelingfeet.com