NIOSH Analytical Method Ethyl Chloride S105 (Set 4).
NIOSH 1977 Jan:10 pages
Ethyl-chloride gas (75003) is trapped by drawing a known volume of air through a large charcoal (16291966) tube. The sampling train consists of two separate tubes, a front adsorbing tube and a backup tube. The charcoal in each tube is transferred to a serum vial and sealed with a septum and an aluminum (7429905) seal. Carbon- disulfide (75150) is used to desorb the ethyl-chloride gas, which is then analyzed by gas-chromatography. The area of the resulting peak is then calculated and compared with areas found using standards. Validation of this method was accomplished over the range of 1586 to 6500mg/cubic meter at 24.5 degrees C and atmospheric pressure of 770.8mm Hg (7439976) using a 3 liter sample volume. Much smaller amounts can be measured using this method if the desorption efficiency is adequate. Desorption efficiency must be determined over the range used. The upper range limit of this method depends on the adsorptive capacity of the charcoal tube. It is also dependent on the concentrations of ethyl-chloride and other substances in air. Average concentrations obtained at OSHA standard level are 1.4 percent lower than the true concentrations. These variations may be random rather than representative of a sampling bias. The sampling device is small and portable but sample size is limited. The precision of the method is limited by the reproducibility of the pressure drop across the tubes.
NIOSH-Author; NIOSH-Analytical-Method; Standards-Completion-Program; SCP; Standards; Sampling; Set-4; Gases; Chloride-gases; Chlorinated-hydrocarbons; Methodology; Instrumentation; Analytical-Method; Air-contaminants;
75-00-3; 16291-96-6; 7429-90-5; 75-15-0; 7439-97-6;
Division of Physical Sciences and Engineering, NIOSH, Cincinnati, Ohio, 10 pages, 3 references