McEnally CS, Sawyer RF, Koshland CP, Lucas D. Sensitive in situ detection of chlorinated hydrocarbons in gas mixtures.
APPLIED OPTICS 1994;
33:3977-3984. [PMID:
20935744 DOI:
10.1364/ao.33.003977]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We detect chlorinated hydrocarbons (CHC's) in gas mixtures by dissociating the CHC's with a 193-nm laser and measuring the subsequent concentration of the CCl fragmentation by means of laser-induced fluorescence. Sub-ppm detection, where ppm indicates parts in 10(6), is achieved for C(2)H(5)Cl with a 10-mm(3) measurement volume and integration over 50 laser shots. Every other CHC tested is also detectable, with the same or better detection limits. The CCl forms promptly during the fragmentation laser pulse through unimolecular dissociation of the parent CHC's. The technique should be a useful diagnostic for CHC incineration systems.
Collapse