Development of a new real-time method for measuring S(IV) in cloud water using a counter-flow virtual impactor

Roy W. Dixon; Robert J. Charlson

doi:10.3402/tellusb.v46i3.15791

Development of a new real-time method for measuring S(IV) in cloud water using a counter-flow virtual impactor

Tellus B: Chemical and Physical Meteorology

Volume 46 (1994): Issue 3

By: Roy W. Dixon and Robert J. Charlson

Open Access

|Jan 1994

Abstract

A new method of analysis for S(IV) is described incorporating a counter-flow virtual impactor for collection and evaporation of cloud droplets with an SO² analyzer. This technique allows analysis of aqueous S(IV) concentration in real-time and overcomes some sampling or analysis problems of conventional sampling with bulk cloud water collectors and wet chemical analysis methods. The technique is demonstrated by the correlated responses of the S(IV) instrument and instruments measuring physical properties of clouds while passing in and out of clouds. Measured aqueous S(IV) concentrations ranged from the detection limit (0.1 nmol per m³ of air) to 1.8 nmol m^-3 in clouds in Ohio. S(IV) molar concentrations (moles/l of cloud water) were not calculable from these measurements, but can be calculated when a measurement of the liquid water content of the collected cloud water is made simultaneously.

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Articles in this issue

DOI: https://doi.org/10.3402/tellusb.v46i3.15791 | Journal eISSN: 1600-0889

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Language: English

Page range: 193 - 204

Submitted on: Feb 26, 1993

Accepted on: Dec 8, 1993

Published on: Jan 1, 1994

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

© 1994 Roy W. Dixon, Robert J. Charlson, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 46 (1994): Issue 3