Laundry factors influencing methyl parathion removal from contaminated denim fabric

ConclusionsThe level of MeP concentration is inversely related to the amount of residue removed through laundry. As a result, higher pesticide concentrations or undiluted chemicals require utmost care in handling. Even following ten multiple launderings, residues of an undiluted MeP contaminant can be readily detected in fabrics, as well as cause mortality to German cockroaches within 24 h. It is recommended therefore, that clothing contaminated with high pesticide concentrations be disposed of by burning or burial, as the fabric remains unsafe to the wearer. Fabrics contaminated with lesser MeP concentrations (i.e. field strength) require a minimum of three launderings before biological activity reaches a harmless level. In addition, sudsy household ammonia as a laundry additive does not practically contribute to pesticide residue removal as the cost and amount of ammonia required to fill a washing machine is not feasible. Other laundry procedures, such as pre-rinsing and/or multiple washing, appear to be more effective.