Degradation Dynamics of Butralin in Soil

A method for the determination of butralin residue in soil using gas chromatography(GC) was developed and degradation dynamics of butralin was estimated.Samples of soil were extracted with acetone.The extracts were cleaned-up with a Florisil column.The residue of butralin was determined by GC method.The average recoveries ranged from 90.71% to 99.06% with relative standard deviation 0.89%-3.34%.The lowest detectable concentration of butralin in soil was 0.05 mg/kg,and the detection limit was 1.89×10-10 g.The results showed that the half-lives of butralin in soil were 9.04 d and 11.17 d at single recommended dosage(1800 g/hm2) and double recommended dosage(3600 g/hm2),respectively.