On-line chemiluminescence detector for hydrogen sulfide and methyl mercaptan
The need for continuous monitoring of species like H/sub 2/S and CH/sub 3/SH in the atmosphere is obvious because of their toxic nature and is particularly important in synfuel production and geothermal energy utilization. Chemiluminescence under the right conditions is an extremely sensitive method, with the possibility of obtaining one photon for each molecule of interest. It is apparent that a selective detector should be based on emission from a species related chemically to the analyte rather than the reagent. ClO/sub 2/ is an interesting reagent in that it reacts, vide infra, with H/sub 2/S and CH/sub 3/SH to produce sulfur atoms, which recombine to form electronically excited S/sub 2/ and in turn result in fluorescence. To minimize the effects of quenching, one must keep the reaction zone at reduced pressures. To maximize sensitivity despite the high-order reaction, one must keep the volume of the reaction zone small, and the reagent gas (ClO/sub 2/) must be in excess to produce complete reaction in a pseudo-first-order regime. A successful on-line chemiluminescence detector is therefore dependent on meeting these various design parameters and is reported here.
- Research Organization:
- Ames Lab., IA
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5680742
- Journal Information:
- Anal. Chem.; (United States), Vol. 54:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
AIR
CHEMICAL ANALYSIS
HYDROGEN SULFIDES
CHEMILUMINESCENCE
THIOLS
AIR POLLUTION
DETECTION
MONITORING
CHALCOGENIDES
FLUIDS
GASES
HYDROGEN COMPOUNDS
LUMINESCENCE
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
POLLUTION
SULFIDES
SULFUR COMPOUNDS
400104* - Spectral Procedures- (-1987)
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)