【摘要】 烟叶及土壤中残留的农药三乙膦酸铝,经碱解生成乙醇气体,以叔丁醇做内标,顶空进样,气相色谱(FID)测定乙醇含量,据三乙膦酸铝对乙醇的转化率,推知三乙膦酸铝残留量。结果表明,三乙膦酸铝在烟叶和土壤中平均添加回收率超过84.0%,相对标准偏差小于8.50%,方法最低检出浓度鲜烟叶和土壤中0.01mg/kg,干烟叶中0.05mg/kg;在烟叶中消解速率较快,半衰期2.44～3.14d,在土壤中消解速率相对较慢,半衰期6.20～8.98d;最后一次施药后21d,三乙膦酸铝最终残留量在烟叶中低于0.68mg/kg,在土壤中低于0.31mg/kg。方法灵敏度和添加回收率符合农药残留分析要求。更多还原

【Abstract】 Phosethy-Al residues in tobacco leaves and soils were analyzed by Gas Chromatography (FID).In this method residues of phosethy-Al transformed into ethanol gas in alkali liquid,the content of ethanol in FID was determined with tert-butyl alcohol as inner demarcate,then the content of phosethy-Al was calculated according to the content of ethanol.Results showed that the fortified recovery in leaves and soils was above 84.0% and relative standard deviation was under 8.50%.The minimum residue in fresh leaves,soils and dry leaves were 0.01,0.01 and 0.05 mg/kg,respectively.The half life in leaves and soils ranged in 2.44-3.14 days and 6.20-8.98 days,respectively.The ultimate residue in leaves was lower than 0.68 mg/kg,and in soils was lower than 0.31 mg/kg,which could fulfill the residue analysis requirement.更多还原