Peracetic Acid Monitoring System to Prevent Serious Health Effects The BACKGROUND Peracetic acid (also known as peroxyacetic acid, or PAA), is an organic compound. It is a colourless liquid with a characteristic pungent odour similar to vinegar. All commercially available PAA products contain an equilibrium of PAA, hydrogen peroxide, acetic acid, and water. Its formula is CH3CO3H. Sterilants used in the food and drink industries are classified as hazardous substances. They must be carefully selected so that potential residues left on surfaces or in packaging materials are not harmful as they may affect product quality and safety. The Control of Substances Hazardous to Health Regs 2002 (COSHH) requires the prevention or control to exposure of hazardous substances. Where exposure canno

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