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Abstract
A new HPLC method to determine temephos in water was developed and tested. The method is reliable for measuring concentrations of temephos in aqueous solutions from 0.005 to 5.0 ppm. The detection limit at 254 nm is 1 ng. The standard curve is not linear over the entire range; separate curves are required for concentrations above and below 0.1 ppm. The method was used to study adsorption of temephos on plastic and glass surfaces. The size of the container, is important to minimize adsorption effects if solutions of 0.01 ppm or less are used. For these solutions, glass containers at least as large as a standard 50 mL beaker should be used for experiments in which a relatively constant concentration of temephos must be maintained for a period of hours.