Ann. occup. Hyg., Vol. 46, No. 1, pp. 97-102, 2002
© 2002 British Occupational Hygiene Society
Published by Oxford University Press
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Sensory Irritation of Acetic Acid, Hydrogen Peroxide, Peroxyacetic acid and their Mixture in Mice
Department of Pollutants and Health, National Institute for Research and Safety, Avenue de Bourgogne, BP No. 27, 54501 Vandoeuvre, France
Received 12 March 2001; in final form 28 June 2001.
The expiratory bradypnoea indicative of upper airway irritation in mice was evaluated during a period of 60 min of oronasal exposure to acetic acid, hydrogen peroxide and peroxyacetic acid vapours. The airborne concentration resulting in a 50% decrease in the respiratory rate of mice (RD50) was calculated for each chemical. The concentration–response curves of acetic acid, hydrogen peroxide and peroxyacetic acid had similar slopes. The results did however show that the three chemicals had different irritant potencies. The RD50 values of acetic acid, hydrogen peroxide and peroxyacetic acid were 227, 113 and 5.4 p.p.m. respectively. Moreover, a mixture containing 53% acetic acid, 11% hydrogen peroxide and 36% peroxyacetic acid had an RD50 of 10.6 ppm, 3.8 ppm being peroxyacetic acid, which is 1.4 times lower than the theoretical value estimated from the fractional concentrations and the respective RD50s of the individual components. On the basis of a TLV-STEL (threshold limit value for short-term exposure limit) equal to 0.1 RD50, the TLV-STELs for acetic acid, hydrogen peroxide and peroxyacetic acid should not exceed 20, 10 and 0.5 p.p.m. respectively. On the basis of a TLV-TWA (time-weighted average) equal to 0.03 RD50, the TLV-TWAs for these same chemicals should not exceed 5, 3 and 0.2 p.p.m. respectively. Finally, these values and existing TLVs in Europe and the USA are compared.
Keywords: peroxyacetic acid, hydrogen peroxide, sensory irritation, mice
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