Yu Jianlei et al (Institute of Plant Protection,Shandong Academy of Agricultural Sciences,Ji′nan 250100)
Residual pencycuron in cotton and soil were extracted by dichloromethane,cleaned up by passing through a magnesium silicate-aluminum oxide(Neutral)column,determined by HPLC The detection limit was as low as 5×10 -10 g,and the minium detectable amount in cotton and soil were 0 05mg/kg and 0 025mg/kg ,the average recoveries of pencycuron in soil and cotton leaves and seeds were 90 5%～90 6% and 86 5%～88 8% and 87 6%～94 4% respectively,the coefficients of veriation ranged from 2 1% to 3 5% and 1 1% to 3 2% and 2 2% to 6 7%
Residual pencycuron in cotton and soil were extracted by dichloromethane,cleaned up by passing through a magnesium silicate-aluminum oxide(Neutral)column,determined by HPLC The detection limit was as low as 5×10 -10 g,and the minium detectable amount in cotton and soil were 0 05mg/kg and 0 025mg/kg ,the average recoveries of pencycuron in soil and cotton leaves and seeds were 90 5%～90 6% and 86 5%～88 8% and 87 6%～94 4% respectively,the coefficients of veriation ranged from 2 1% to 3 5% and 1 1% to 3 2% and 2 2% to 6 7%
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