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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Development of Continuous Monitoring System of Acidic Pollutants for The Studies of Their Diffusion in The Atmosphere

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1992, v.5 no.3, pp.269-276
Chung, Hyung-Keun
Dasgupta, Purnendu K.
Lee, Dai Woon
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Abstract

An ion-exchange/conductometric method is applied for the determination of total acidity in simulated atmospheric samples. Non-<TEX>$H^+$</TEX> cations and strong acid anions are enriched by the preconcentrator columns in series and eluted through the corresponding parallel suppressor units. The conductivities from each channel correspond to the concentrations of the resulting ionized species in equivalents per unit volume. The difference is the measure of acidity due to strong acids. With 5-min sampling at a flow rate of 0.3 mL/min, the detection limits for <TEX>${NH_4}^+$</TEX> and <TEX>${SO_4}^{2-}$</TEX> are 0.3 and <TEX>$0.1{\mu}equiv/L$</TEX>, respectively. The acidity for samples composed of various ions can be determined without significant error, usually less than 5%. The proposed method discriminates against the artifact from the <TEX>$CO_2$</TEX> dissolution. Principles of acidity measurements are also presented.

keywords
Ion-exchange/conductometric method, atmospheric samples


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