Determination of formaldehyde vapour in the atmospheres of clinical laboratories using chromotropic acid

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Abstract
Ethanol and xylene vapours were found to interfere with the determination of formaldehyde vapour by the chromotropic acid method, whether water or a mixture of chromotropic and sulphuric acids were used as the scrubbing solution. The interference can be removed by a porous polymer sorbent, Tenax GC. Thus, with a Tenax GC pre-trap, the chromotropic acid method can be applied to the determination of formaldehyde vapour in clinical laboratories where alcohol and xylene vapours are often encountered. The advantages of selecting chromotropic-sulphuric acid instead of water as the scrubbing solution are discussed.

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