Analytical method for the determination of chlorinated hydrocarbons
Translation of DGUV Information 213-565 (former BGI 505-65 or ZH1/120.65)
| Chemical name | Synonyms | CAS Number | validated |
|---|---|---|---|
| Dichloromethane | 75-09-2 | method 03 | |
| Tetrachloroethene |
Tetrachloroethylene Perchloroethylene Perc |
127-18-4 |
method 02 method 03 |
| Tetrachloromethane | 56-23-5 | method 02 | |
| 1,1,1-Trichloroethane | 71-55-6 |
method 02 method 03 |
|
| 1,1,2-Trichloroethane | 79-00-5 | method 02 | |
| Trichloroethene |
Trichloroethylene Tri |
79-01-6 |
method 02 method 03 |
| Trichloromethane | 67-66-3 | method 02 |
Method 03 – GC
Sampling is carried out with a pump and adsorption onto Chromosorb 106. Analysis is performed by gas chromatography after thermal desorption.
This method permits the determination of the concentration of chlorinated hydrocarbons (CHCs) such as dichloromethane, tetrachloroethylene, 1,1,1-trichloroethane and trichloroethylene in working areas averaged over the sampling duration after personal or stationary sampling.
Principle
A defined volume of air is drawn through an adsorption tube filled with Chromosorb 106 using a suitable pump. The adsorbed chlorinated hydrocarbons are then thermally desorbed from the sample tube and determined by means of gas chromatography fitted with a flame ionisation detector (FID). The calibration is carried out with test gases or methanolic calibration solutions containing the corresponding analytes.
Limit of quantification (LOQ)
Absolute: 0.17 to 0.86 µg per CHC.
Relative: 0.85 to 4.3 mg/m³ of CHC for an air sample volume of 200 mL.
Issue
October 2014
The complete measuring method is available in the Wiley Online Library: Method for the determination of chlorinated hydrocarbons in workplace air using gas chromatography after thermal desorption (Air Monitoring Methods, 2016).
Method 02 – GC
Sampling is carried out with a pump and adsorption on activated charcoal. Analysis is performed by gas chromatography after desorption.
The analytical method describes the determination of the mean concentration of tetrachloroethylene, carbon tetrachloride, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene and trichloromethane, abbreviated to chlorinated hydrocarbons (CHC) in this method, in the workplace air averaged over the sampling period after personal or stationary sampling.
Principle
A defined air volume from the breathing zone is drawn through a tube containing activated charcoal by a sampling pump. The CHCs occurring in the gaseous state in the workplace air are adsorbed onto the activated charcoal layer. Then the adsorbed CHCs are desorbed with carbon disulfide and are determined by means of a flame ionisation detector (FID) after gas chromatographic separation onto two capillary columns of different polarity.
Limit of quantification (LOQ)
Absolut: 0.6 ng to 3.9 ng per CHC.
Relativ: 0.04 to 0.24 mg/m³ of CHC for 25 L of air sample volume, 1.5 mL desorption solution and an injection volume of 1 µL.
Issue
October 2014
The complete measuring method is available in the Wiley Online Library: Method for the determination of chlorinated hydrocarbons in workplace air using gas chromatography (Air Monitoring Methods, 2016).
You can reach the German-language version of the article with a single click on the flag-symbol.
