液液萃取-气相色谱法测定地表水中10种硝基苯类化合物

将水样(200mL)用正己烷(10mL)萃取,所得萃取液经无水硫酸钠干燥后供气相色谱分析。用DB-1701色谱柱,温度在110℃～210℃区间采用程序升温方式进行分离,用电子捕获检测器测定。10种硝基苯类化合物的峰面积与对应的质量浓度在一定范围内呈线性关系,检出限在0.10～2.5μg.L-1之间。用标准加入法测得10种硝基苯类化合物的回收率在86.4%～96.2%之间,测定值的相对标准偏差(n=7)均小于5%。

GC Determination of 10 Nitrobenzene Homologues in Surface Water with Liquid-Liquid Extraction

Water sample(200 mL) was extracted with n-hexane(10 mL),and after dehydration with anhydrous Na2SO4,the extract was used for GC analysis,using DB-1701 chromatographic column for separation in the temperature range from 110 ℃ to 210 ℃ with programmed temperature elevation.ECD was used in the determination.Linear relationships between values of peak area and mass concentration of the 10 nitrobenzene homologues were found in definite ranges,with detection limits in the range of 0.10-2.5 μg·L-1.Tests for recovery and precision were made,giving values of recovery in the range of 86.4%-96.2% and RSD′s(n=7) less than 5%.