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KMID : 0385519960090020123
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Analytical Science & Technology
1996 Volume.9 No. 2 p.123 ~ p.133
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Gas Chromatographic Analysis on Residual Difenoconazole in Apple and Soil
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Abstract
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The optimum conditions for the analysis of the difenoconazole fungicide oil Soil and crops´ were investigated and the residues of that in apple and soil were identified by using the gas chromatography. The extract with acetonitrile was separated with saturated NaCI and n-hexane solution after filtered, and concentrated. Obtained´ fungicide residues were transfered to the florisil column and eluted with acetone and n -hexane mixed solution for the analysis by GLC(ECD)..From the standard addition experiments with 0.20 and 1. Oppm, the average recoveries were 8692% and the detection limit was 0.01 ppm. It seems to be safely used when difenoconazole is treated three times until 15 days before; harvest of apple. In this case residual amounts of difenoconazole in apple was from 0.037ppm to 0. 044ppm. The soil samples extracted with methanol andammonium hydroxide mixed solution were partitioned with dichloromethane and saturated sodium chloride solution. The orgaoi(´ phase was, concentrated and redissolved withtoluene and analyzed with GLC(PID) after cleaned with Sep-Pak column. From the standard addition experiments with 0.10, 0.50 and I´.Oppm, the average recoveries were 101.2--103.7% and the detection limit was. 0.025ppm.
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