Carbonate and Noncarbonate Carbon in Atmospheric Particles

PM2.5 carbonate concentrations at regionally representative Interagency Monitoring of Protected Visual Environment sites

“…There are a few outliers that may be caused by incomplete drying of the filter after carbonate carbon analysis, inhomogeneous aerosol deposits across the filter surface, or uncertainty in the optical pyrolysis adjustment for a dark filter (these were heavily loaded samples). For most of the samples, the differences are within 3 standard deviations of the measure- These results were probably influenced by precipitation/ irrigation and soil formation in the area Mueller et al [1971Mueller et al [ , 1972 Pasadena, CA, USA summer 1969 <20 -880 ng m À3 (PM of 0.1 -17 mm)…”

Technique for determining pollutant emissions from a gas-fired range

“…Modified pararosaniline method (Miksch et al, 1981) Electrical mobility analysis (Whitby, 1976) Virtual impaction (Loo et al, 1976)! Tandem filtration (Paer et al, 1977) Gravimetric analysis X-ray f1uorescece (Giauque et al, 1973) Combustion/gas chromatography (Mueller et al, 1970) Miscellaneous…”

“…Samples for mass and carbon determination were size-segregated using a tandem-filter arrangement (Parker et al, 1977) and were collected on teflon and quartz fiber filters, respectively. Fine particulate mass was determined gravimetrically, and carbon content was determined by combusting the aerosol sample in oxygen and measuring the resulting carbon dioxide (Mueller et al, 1970). -…”

Microchemical Characterization of Aerosols

“…The latter technique gives a measurement that is proportional to the amount of light-absorbing (black) carbon present on the filtero The quartz filter is used for total carbon determination by a combustion method similar to that described by Mueller et al [2).…”

“…The total amount of particulate carbon is then: (2) We define specific attenuation (o) as the attenuation per unit mass of total carbon:…”