Determination of nitrate in atmospheric particulate matter by thermal decomposition and chemiluminescence
A thermal decomposition/chemiluminescence method is presented for determining nitrate in atmospheric particular matter. Nitrate in the sample is thermally decomposed to NO/sub x/, which is then determined with a commercial chemiluminescence NO/sub x/ monitor. The nitrate in a filter sample can be determined directly by heating a segment of the filter in a furnace or after extraction of the filter by flash heating the aqueous extract in a sample loop. In either case, the sample is decomposed in a nitrogen atmosphere to avoid interference from ammonium. The NO/sub x/ peak from nitrate decomposition can be quantified by integrating the chemiluminescence signal or by integrating the gas sample in a Tedlar bag prior to the chemiluminescence measurement. The technique is straightforward, fast, and sensitive, and interferences in atmospheric samples are negligible. A comparison of the thermal decomposition/chemiluminescence method with ion chromatography using filter samples collected in ambient air showed good agreement over a wide range of concentrations. 26 references.
- Research Organization:
- Battelle Columbus Labs., OH
- OSTI ID:
- 5048531
- Journal Information:
- Anal. Chem.; (United States), Vol. 57:12
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AIR
QUANTITATIVE CHEMICAL ANALYSIS
NITRATES
EMISSION SPECTROSCOPY
ION EXCHANGE CHROMATOGRAPHY
NITROGEN OXIDES
CHEMILUMINESCENCE
PARTICULATES
AIR POLLUTION MONITORS
DECOMPOSITION
EXPERIMENTAL DATA
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CHROMATOGRAPHY
DATA
FLUIDS
GASES
INFORMATION
LUMINESCENCE
MEASURING INSTRUMENTS
MONITORS
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLES
SEPARATION PROCESSES
SPECTROSCOPY
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
400104 - Spectral Procedures- (-1987)
400102 - Chemical & Spectral Procedures