气相色谱法测定土壤中六六六和滴滴涕

Determining benzene hexachloride (BHC) and DDT in soil by using gas chromatography

采用丙酮-石油醚提取,以浓硫酸净化,用带电子捕获检测器的气相色谱仪测定。方法的检出限分别为α-六六六1 6ng/g,β-六六六3 2ng/g,γ-六六六1 7ng/g,δ-六六六2 0ng/g,p,p'-DDE3 1ng/g,p,p'-DDD3.2ng/g,o,p'-DDT3 4ng/g,p,p'-DDT4 1ng/g。测得精密度RSD(n=6)≤9.0,回收率89 0%～99 9%。

Adopting acetone-light petroleum extraction, purifying with concentrated sulfuric acid, determining BHC and DDT by using electronic-capture gas chromatography (ECGC). The detection limit of the method are respectively α-BHC 1.6ng/g, β-BHC 3.2ng/g, γ-BHC 1.7ng/g, δ-BHC 2.0ng/g, P,P'-DDE 3.1ng/g, P,P'-DDD 3.2(ng/g,) O,P'-DDT 3.4ng/g, P,P'-DDT 4.1ng/g. Measured precision is RSD (n=6) ≤9.0, rate of recovery is 89.0%～99.9%.