摘要
采用磁性氯甲基聚苯乙烯微球(CMPNs)固相萃取-气相色谱-串联质谱法测定环境水样中7种硝基苯类化合物(NBs)的含量。优化的试验条件如下:(1)萃取剂为CMPNs材料;(2)CMPNs的用量为15.0mg;(3)萃取时间为4min;(4)氯化钠的加入量为340g·L~(-1);(5)洗脱剂丙酮的用量为3mL;(6)洗脱时间为1min。气相色谱分离用HP-INNOWAX色谱柱,质谱分析采用全扫描和选择离子监测模式。7种NBs的质量浓度均在0.2~4.0μg·L~(-1)内与其峰面积呈线性关系,方法的检出限(3S/N)在0.006~0.022μg·L~(-1)之间。7种NBs测定值的相对标准偏差(n=6)在0.30%~5.3%之间。方法用于环境水样的分析,回收率在72.4%~113%之间。
GC-MS/MS was applied to the determination of 7nitrobenzenes in environmental water samples with solidphase extraction based on chloromethylated magnetic polystyrene nanospheres(CMPNs).The optimized conditions found were as follows:(1) extracting agent:CMPNs material;(2) amount of CMPNs:15.0 mg;(3)extraction time:4min;(4) amount of NaCl:340g·L~(-1);(5) amount of acetone(eluant):3mL;(6) elution time:1min.The HP-INNOWAX chromatographic column was used for GC separation,and the full-scanning mode and the selected ion monitoring mode were adopted in MS.Linear relationships between values of peak area and mass concentration of the 7nitrobenzenes were kept in the same range of 0.2-4.0μg·L~(-1),with detection limits(3S/N)in the range of 0.006-0.022μg·L~(-1).Precision of the method was tested,and values of RSD(n=6)for7NBs found were in the range of 0.30%-5.3%.The proposed method was applied to the analysis of environmental water samples,giving values of recovery in the range of 72.4%-113%.
引文
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