Abstract
A simple method was developed for the determination of captan and chlorothalonil (TPN) in air. Air was taken through two round shaped activated carbon fiber papers with diameter of 47 mm (Toyobo KF Paper P-175) using an automated sequential air sampler (Tokyo Dylec 10-line Global Sampler GS-10D) at 10 to 20 l min-1 for 3 h. Each the sampled paper was extracted ultrasonically with 3 ml of xylene for 10 min followed by centrifugation at 3000 rpm for 10 min. An aliquot of the supernatant was analyzed by GC equipped with ECD (63Ni) on a fused-silica capillary column coated with methyl silicone (df=2.65 μm, 0.53 mm i.d.×10 m). The collection efficiencies and recoveries of captan and TPN were quantitative; the minimum detectable concentrations were 4 ng m-3 for captan and TPN. The fungicides were stable on the paper for a week at -20°C. This method was applied to determine captan and TPN in air near golf courses.
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