Determination of atmospheric concentrations of sulfuric acid aerosol by spectrophotometry, coulometry, and flame photometry

Scaringelli, Frank P.; Rehme, Kenneth A.

doi:10.1021/ac60275a001

Cited by 49 publications

(11 citation statements)

References 25 publications

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“…Electroanalyrical methods may be used for the determination of various other sulfur-containing species (besides SOz) in air. Sulfuric acid aerosol may be measured coulometrically (detection limit 0.03 pg H7SOt) following collection by impaction or filtration, which provides for separation of the analyte of interest from SO2 [136]. Hydrogen sulfide can be determined at partper-billion levels in air by potentiometric titration via a sulfide ISE [13?].…”

mentioning

confidence: 99%

Electroanalytical applications in occupational and environmental health

Ashley

1994

Electroanalysis

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Electroana1:Tical chemistry has been used for years in the occupational and environmental health fields. Portable sensors and analytical devices based on electrochemical (EC) methods are commonly used on-site in the workplace. Laboratory EC methods also have been used extensively for the analysis of industrial hygiene and related samples. Recent advances in electroanal>-tical methodolog may lead to new analytical applications in the occupational health arena, both in the laboratory as well as on-site in the xvorkplace. Applications in heavy metals analysis, analysis for inorganic and organic species, and bioanalysis are exemplified. This article provides an overview of the history of EC analysis for industrial hygiene purposes, and also summarizes current and newly developed applications of electroanaljdcal methods in occupational and environmental health.

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confidence: 99%

Electroanalytical applications in occupational and environmental health

Ashley

1994

Electroanalysis

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“…Thermal volatilization schemes were popular for several years for speciation of acidic sulfate compounds in aerosols. Filter samples were heated and H2SO4 collected by microdiffusion (6,7) or determined directly by flame photometry after volatilization from Teflon filters (8,9). In one method, H2SO4 was distinguished from other volatile sulfates [e.g., ammonium bisulfate (NH4HSO4) and ammonium sulfate ((NH4).…”

Section: Filter Collectionmentioning

confidence: 99%

“…The exposure and event results shown in Table 5 and are divided into representative studies with sample collection times of 24 hr, 12 hr, 6 hr, 1 hr, and a combined sampling time. This was done because the length of reported events is different for the various collection times.…”

Section: Acidic Sulfate Exposure and Eventsmentioning

confidence: 99%

Acidic sulfate aerosols: characterization and exposure.

Lioy¹,

Waldman²

1989

Environ Health Perspect

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Exposures to acidic aerosol in the atmosphere are calculated from data reported in the scientific literature. The majority of date was not derived from studies necessarily designed to examine human exposures. Most of the studies were designed to investigate the characteristics of the atmosphere. However, the measurements were useful in defining two potential exposure situations: regional stagnation and transport conditions and local plume impacts. Levels of acidic aerosol in excess of 20 to 40 micrograms/m3 (as H2SO4) have been observed for time durations ranging from 1 to 12 hr. These were associated with high, but not necessarily the highest, atmospheric SO4(2)- levels. Exposures of 100 to 900 micrograms/m3/hr were calculated for the acid events that were monitored. In contrast, earlier London studies indicated that apparent acidity in excess of 100 micrograms/m3 (as H2SO4) was present in the atmosphere, and exposures less than 2000 micrograms/m3/hr were possible. Our present knowledge about the frequency, magnitude, and duration of acidic sulfate aerosol events and episodes is insufficient. Efforts must be made to gather more data, but these should be done in such a way that evaluation of human exposure is the focus of the research. In addition, further data are required on the mechanisms of formation of H2SO4 and on what factors can be used to predict acidic sulfate episodes.

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“…Primary standards for airborne particulate matter have been promulgated recently (5,6). The use of the Hi-Vol sampler appears to be adequate and accurate (7)(8)(9)(10)(11) for the determination of airborne concentrations of total suspended particulate matter.…”

Section: Table III Size Distribution Of Typical Aerosolmentioning

confidence: 99%

“…Their system failed to give reproducible data from day to day under presumably the same conditions. Scaringelli and Rehme (5) have reported an aerosol generator that uses fuming sulfuric acid and a condensation technique, but does not incorporate a reheater as in the La Mer-Sinclair generator.…”

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confidence: 99%