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Ann. occup. Hyg., Vol. 46, No. 1, pp. 89-96, 2002
© 2002 British Occupational Hygiene Society
Published by Oxford University Press

Article

Generation of Controlled Atmospheres for the Determination of the Irritant Potency of Peroxyacetic Acid

G. HECHT* and M. HÉRY

Institut National de Recherche et de Sécurité, BP 27, 54501 Vandoeuvre les Nancy Cedex, France

Received 12 March 2001; in final form 28 June 2001.

Given the physical properties of peroxyacetic acid, which decomposes into acetic acid and hydrogen peroxide, the generation and analysis of controlled atmospheres used to test the irritant potency of this peracid in mice require specific developments. The sampling and analytical method was based on the simultaneous sampling on a titanyl sulphate-impregnated silica gel tube (allowing the determination of total peroxides, peroxyacetic acid and hydrogen peroxide) and in an impinger containing a methyl-p-tolyl sulphide solution (of which the analysis yields the concentration of total acids, peroxyacetic acid and acetic acid, and peroxyacetic alone). From these results the concentrations of the different products can be inferred without interference. A special device composed of inert materials was designed for the generation of the controlled atmosphere. Buffering the peroxyacetic solution at pH 7 with a phosphate buffer allowed the generation of peroxyacetic acid atmospheres with negligible concentrations of acetic acid and hydrogen peroxide.

Keywords: controlled atmosphere; peroxyacetic acid; irritant potency


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G. HECHT, M. HERY, G. HUBERT, and I. SUBRA
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