Statistical correlation between ambient sulfate concentration and sulfur dioxide concentration, total suspended particulates, and relative humidity for 13 eastern states

Meyers, Ronald E.; Ziegler, Edward N.

doi:10.1021/es60139a014

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…Theoretical calculations by Middleton et al (41) indicate that oxidation by H202 in wet aerosols can be a dominant reaction pathway under certain atmospheric conditions. Field measurements by different investigators have shown correlations between water vapor and aerosol sulfate concentration at humidities above 70% (42,43). This indicates that at higher volumes of liquid-phase aerosol in the atmosphere, the oxidation of S02 is enhanced by conditions that favor aqueous-phase reactions.…”

Section: Discussionmentioning

confidence: 99%

Strong and weak acidity of aerosols collected over the northeastern United States

Ferek¹,

Lazrus²,

Haagenson³

et al. 1983

Environ. Sci. Technol.

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Total sulfate, acidity, and principal cations were measured in aerosol samples collected from an aircraft over the northeastern United States and at ground level on filters protected by a denuder tube for NH3. Aerosol acidity was determined by aqueous extraction of the filters and titration with NaOH. Strong and weak acid components were resolved by using Gran plots, and for 30 fall and summer samples the weak acidity comprised x ± s = 26 ± 12% of the total acidity. The strong acidity averaged 25 ± 18% of the total sulfate equivalents. Hydrogen ion plus ammonium ion balanced closely the sulfate ion concentration with the ratio of equivalents of [(H+) + (NH4+)]/(S042_) = 1.03 ± 0.14 for 36 samples. A phase diagram for the H20-H2S04-(NH4)2S04 system was used to determine that the aerosol particles were liquid at the ambient relative humidity in 24 of 47 cases. For the 24 liquid samples the calculated pH averaged 0.11 ± 0.59.

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Section: Discussionmentioning

confidence: 99%

Strong and weak acidity of aerosols collected over the northeastern United States

Ferek¹,

Lazrus²,

Haagenson³

et al. 1983

Environ. Sci. Technol.

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“…Gas phase conversion of SO2 to sulfate implies that reduction of SO2 emissions should result in roughly proportional reductions in sulfate and acidity. However, reductions in SO2, when actually accomplished, have not resulted in corresponding reductions in sulfate (1)(2). This is the well-known "urban sulfate anomaly," which has provoked considerable debate (1,3).…”

Section: Soot-catalyzed Reactionsmentioning

confidence: 99%

“…In our study (1 conversion was observed in of the LL patients and in 8( the BB/BL (borderline) months after vaccination. In study (2), 70 percent of the LL patients exhibited a po; min (Mitsuda) reaction 8 r vaccination. There is stron that the Mitsuda reaction is a of the host immunity against This development therefore promise, and we shall soon ing multicentric field trials cine.…”

mentioning

confidence: 92%

Erratum: Bronchoconstrictor Effects of Leukotriene C in Humans

1982

Science

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“…Although the subnetworks have been defined, the parameter coverage required for each type of station is not clear cut (U S Environmental Protection Agency 1975a, 1977a the atmosphere (Myers and Ziegler 1978) and thereby serve as a check on the effectiveness of air pollution control programs. In the past, studies by Nienkerk and Flemal (1976) have shown high sulfate levels in streams in areas where high concentrations of atmospheric sulfur dioxide have also been found.…”

Section: Parameter Selectionmentioning

confidence: 99%