NVN 2965-1992 Air quality. Workplace atmosphere. Determination of the concentration of vaporous chlorinated hydrocarbons by active sorbent tube sampling, thermal desorption and gas chromatography
The preliminary standard applies to the determination of the concentration of one or more of the following volatile chlorinated hydrocarbons in workplace air using an adsorption tube filled with a suitable adsorbent that can be thermally desorbed: chlorinated hydrocarbons CAS no. 1> a. dichloromethane 75-09-2 b. tetrachloromethane 56-23-5 c. 1,2-dichloroethane 107-06-2 d. 1,1,1-trichloroethane 71-55-6 e. 1,1,2-trichloroethane 79-00-5 f. trichloroethylene 79-01-6 g. 1,1,1,2-tetrachloroethane 630-20-6 h. 1,1,2,2-tetrachloroethane 79-34-5 i. tetrachloroethene 127-18-4 j. chlorobenzene 108-90-7 1) CAS no. = Chemical Abstracts Service Registry Number. The preliminary standard can be used for a concentration range from 0.2 to 1000 mg/m3 with a sample volume of 2.5 L and a sampling period of 15 minutes to 8 hours. For the limitations on the area of application, see also NVN 2948. Other components that have an equal or almost equal retention time in the gas chromatographic analysis as the substance(s) to be determined can interfere. The interference can be reduced by correct choice of column and setting of the gas chromatograph. The sampling method is suitable for both personal sampling and location-based sampling and provides an average concentration over a certain time (time-weighted average, TGG). For an alternative determination method for volatile chlorinated hydrocarbons, see NVN 2964.
NVN 2965-1992 history
1992NVN 2965-1992 Air quality. Workplace atmosphere. Determination of the concentration of vaporous chlorinated hydrocarbons by active sorbent tube sampling, thermal desorption and gas chromatography