【摘要】 本文比较了10种降低正己烷试剂中BHC和DDT残留量的方法,结果表明经作者改进的迴流碱解法的纯化效果较好,且简使快速。此外,还介绍了浓硫酸和无水硫酸钠试剂的纯化方法。更多还原

【Abstract】 Ten procedures are compared for reducing BHC and DDT residuals in hexane. The results show that the improved alkali reflux, a simple and feasible procedure can reduce the ∑BHC and ∑DDT in hexane to 10.3±2.20 and 14.0±3.38 ng/L respectively. The procedure consists of a reflux of hexane with NaOH（1%, w/w）at 70—80℃ for 4h in an all-glass system before distilling to collect exactly the 68—69℃ fraction. The preparation of other reagents, e.g. H₂SO₄ and anhydrous Na₂SO₄, used in pesticde analysis is also discussed.更多还原