Real-time instrument for ambient monitoring of hydrogen sulfide, dimethyl sulfide, and other reduced organosulfur species using ozone chemiluminescent detection
The chemiluminescent reactions of H/sup 2/S and other gaseous sulfides with ozone at 298/sup 0/K have been investigated, with the aim of developing a simple, selective, real-time monitor for these naturally emitted compounds. A commercial chemiluminescent ozone monitor has been adapted, for detection of the ozone/sulfide chemiluminescence between 300 and 400 nm wavelenght. Excess ozone was supplied to the reaction chamber from an electrical discharge ozone source. Response to dimethyl sulfide was enhanced by the use of air in the ozone source rather than oxygen. This effect was found to be caused by the presence of oxides of nitrogen produced in the ozonizer; a similar enhancement was not observed for the other sulfide compounds studied. Observed chemiluminescence signal decreased in the order CH/sub 3/SH > CH/sub 3/SCH/sub 3/ > H/sub 2/S > thiophene, with detection limits of 0.1, 0.3, 4, and 12 ppb respectively, at an instrument time constant of 60 sec. Calibration plots were linear at low sulfide concentrations, and showed less-than-first order dependence on sulfide at higher concentrations. A very small signal from ethylene was the only interference found from several compounds tested; sample air humidity has a small but significant effect on the instrument response.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5305833
- Report Number(s):
- BNL-31252; CONF-820627-5; ON: DE82016215
- Resource Relation:
- Conference: 75. annual meeting on the Air Pollution Control Association, New Orleans, LA, USA, 20 Jun 1982
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN SULFIDES
AIR POLLUTION MONITORS
ATMOSPHERIC CHEMISTRY
CHEMILUMINESCENCE
ETHYLENE
OZONE
ALKENES
CHALCOGENIDES
CHEMISTRY
HYDROCARBONS
HYDROGEN COMPOUNDS
LUMINESCENCE
MEASURING INSTRUMENTS
MONITORS
ORGANIC COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)