Abstract
A diffusion denuder, with a thin membrane tube as the collecting element and with a scrubber solution flowing in a narrow annular gap outside the membrane is described. The use of this diffusion scrubber with a cation exchange membrane in conjunction with a dilute acid scrubber has been exploited for collecting ammonia. The advantages of the diffusion scrubber as a highly efficient concentrator of soluble atmospheric gases and as an integral part of a microflow continuous flow analysis system are discussed.
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