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- W2472154980 abstract "Particulate matter less than 10 {micro}m in aerodynamic diameter (PM10) has been routinely sampled throughout the US and elsewhere in the world for years, but these samples are usually only weighed for total mass and summarily stored. However, these samples can be (and sometimes are) analyzed for their ionic composition (i.e. of sulfates, SO{sub 4}{sup {minus}2}; nitrates, NO{sub 3}{sup {minus}}; and ammonium, NH{sub 4}{sup +}) via ion chromatography. Furthermore, it is hypothesized that the imbalance of these easily measured ions (i.e. anion-cations) may provide a useful estimate of the remaining unmeasured major particulate cation: aerosol strong acidity, H{sup +}. Conventional methods for directly measuring H{sup +} entail great care to protect the collected acid from neutralization by ambient ammonia, basic particles, or alkaline filter media, in order that all the H{sup +} measurements side-by-side with state-run PM10 samplers in Albany, NY and in New York City, NY in order to test whether the PM10 ion difference estimates concur with the directly measured H{sup +}. Despite the lack of neutralization protection of the PM10 samples, it was found that the ion difference method yields H{sup +} highly correlated with, and not significant different from, the directly measured H{sup +}." @default.
- W2472154980 created "2016-07-22" @default.
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- W2472154980 date "1994-12-31" @default.
- W2472154980 modified "2023-09-22" @default.
- W2472154980 title "The use of PM10 anion-cation difference as an index of historical aerosol acidity" @default.
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