Exposure to Guthion During Spraying and Formulating

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Abstract
During the formulation of Guthion 25% wettable powder and the spraying of apple orchards with sprays containing 0.5 to 6.0 lb of 25% wettable powder per 100 gallons of water the following air concentrations and exposures were found: Average air concentrations in the operators'' breathing zone during spraying, tank filling, and formulating were 0.64, 2.76, and 4.24 mg/cubic meter of air, respectively. In the absence of chemical cartridge type respirators, the average daily respiratory exposures during spraying, tank filling, and formulating were found to be 1.12, 0.95, and 4.48 mg when determined by the direct method using the filter pad technique. In the absence of protective clothing, average dermal exposures during spraying, tank filling, and formulating were found to be 49.5, 39.6, and 80.9 mg/day when determined by the direct method using the absorbent pad technique. The results of measured respiratory and dermal exposures indicate that, under conditions such as obtained during the above survey, workers in apple orchards and formulating plants are unlikely to exhibit symptoms of acute Guthion poisoning.