顶空-气质联用法分析水体中DMA、DEA和MEA

Headspace GC-MS for Determination of DMA,DEA and MEA in Water

提出采用顶空-气质联用法快速分析环境水体中的2,6-二甲基苯胺(DMA)、2,6-二乙基苯胺(DEA)和2-甲基-6-乙基苯胺(MEA)。在优化顶空条件的基础上,确定了最佳实验条件:以氢氧化钠作为基体改进剂,基体改进剂添加量为3.0 g,顶空平衡温度为80℃,顶空平衡时间为40min。结果表明,该方法可以有效分离水样中的DMA、DEA和MEA,在0~200.0μg/L范围内具有良好的线性关系(r^(2)≥0.998),方法的检出限在0.30~0.41μg/L之间,加标回收率在77.4%~110.6%之间,相对标准偏差(n=8)在3.8%~11.6%之间。该方法具有操作简单快速、精密度和准确度良好等优点,适用于环境水体中DMA、DEA和MEA的同时快速测定。

This paper proposed a headspace GC-MS method for rapid determination of 2,6-xylidine(DMA),2,6-diethylaniline(DEA)and 2-methyl-6-ethylaniline(MEA)in environmental water.Based on the optimization of headspace conditions,the optimal analytical conditions were determined as follows:sodium hydroxide was used as the matrix modifier,the dosage of matrix modifier was 3.0 g,the headspace equilibrium temperature was 80℃and the headspace equilibrium time was 40 min.The method effectively separated DMA,DEA and MEA from the water samples,and had a good linear relationship(r^(2)≥0.998)in the range of 0-200.0μg/L.The detection limit of the method was 0.30-0.41μg/L,the recovery rates was in the range of 77.4%-110.6%,and the relative standard deviation(n=8)was between 3.8%and 11.6%.The method has the advantages of simple and rapid operation,good precision and accuracy,and is suitable for simultaneous determination of DMA,DEA and MEA in environmental water.