将水样(200 mL)用甲苯(10.0 mL)萃取,所得萃取液经无水硫酸钠干燥后供气相色谱分析。用HP-1色谱柱,在60 ℃~200 ℃温度区间采用程序升温方式进行分离,用电子捕获检测器(ECD)测定。根据保留时间作定性检定,用外标标准曲线法作定量测定。15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0.072~0.96 μg·L-1之间。用标准加入法测得15种化合物的回收率在92.6%~99.2%之间,测定值的相对标准偏差(n=6)在1.7%~4.2%之间。

Water sample (200 mL) was extracted with toluene (10.0 mL), and after dehydration with anhydrous Na2SO4, the extract was used for GC analysis, using HP-1 chromatographic column for separation in the temperature range from 60 ℃ to 200 ℃ with programmed temperature elevation. ECD was used in the determination. Qualitative analysis was performed according to the retention times, and quantification was attained by external standard curves. Linear relationships between values of peak area and mass concentration of the 15 nitrobenzene homologues were found in definite ranges, with detection limits in the range of 0.072-0.96 μg·L-1. Tests for recovery and precision were made, giving values of recovery in the range of 92.6%-99.2% and of RSD′s (n=6) ranged from 1.7% to 4.2%.