Determination of Dimethylurea,Methomyl Oxime and Methomyl in Wastewater by High Performance Liquid Chromatography
High performance liquid chromatography was used with a C18 column and a bipolar detector,and methanol and water(0.1% ammonium acetate contained)was used as the mobile phase(volume ratio of methanol to water was 25:75),with an absorption wavelength of 210 nm and a quantitative ring of 20 µL.There was a simultaneous determination of dimethyl urea,methomyl oxime,and methomyl in wastewater under chromatographic conditions with a flow rate of 1.0 mL/min and column temperature of 40 ℃.The results showed that the linear coefficients of dimethylurea,methomyl oxime,and methomyl were 0.999 87,0.999 94,and 0.999 88 respectively.The average addition recovery rates were 99.98% ,99.90% ,and 100.01% ,with standard deviations of 0.12,0.16,and 0.092,and relative standard deviations of 0.49% ,0.25% ,and 0.36% .This method has the advantages of good linear range,high sensitivity,high speed,accuracy,and reliability,and is suitable for the simultaneous determination of dimethyl urea,methomyl oxime,and methomyl in wastewater.
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