1982 Volume 31 Issue 9 Pages 529-531
The rapid method was investigated for the determination of organophosphorous pesticides: parathion, methylparathion, methyldemetone, EPN: in waste waters. Equal volumes of sample water and acetone were mixed by the ultrasonic irradiation for 5 min and centrifuged on (30004000) r. p. m. for 5 min. Pesticides in 1 μl of the water acetone mixture phase were determined by a gas chromatograph with a 2 % silicon DC QF-1 column (3 mm i. d.×2 m) at 210°C and a flame thermionic detector (FTD). The selectivity of organophosphorous compounds against hydrocarbons was improved by FTD without collector voltage. The detection limit of organophosphorous pesticides was 0.1 mg/l. The recoveries of 1.0 mg/l pesticides in waste waters containing 100 mg/1 soybean oil were (99106) % and coefficients of variation were (2.7 8.7) %. The whole procedure was completed within 20 min.
