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Determination of dihalobenzoquinones in water using gas chromatography coupled with an electronic capture detector

机译：气相色谱-电子捕获检测器测定水中的二卤代苯醌

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Dihalobenzoquinones are a group of disinfection byproducts with high potential toxicity and thus currently receiving increased attention. A determination method of 2,6-dichloro-1,4-benzoquinone (2,6DCBQ) and 2,6-dibromo-1,4-benzoquinone (2,6-DBBQ) was developed upon using liquid-liquid extraction and a gas chromatography with an electronic capture detector (LLE-GC-ECD). The optimized extraction condition was as the following: volume ratio of formic acid to water 0.005%, Na2SO4 dosage 200 g L-1 , methyl-tert-butyl ether (MtBE)/water volume ratio 1/10, and extraction with MtBE for once. With the dosed concentrations of 0.5-5.0 mu g L-1 , the recovery rates of 2,6-DCBQ and 2,6-DBBQ were 81%-88% and 73%-96%. The limits of quantitation (LOQs) of the LLE-GC-ECD method were 2.4 and 2.7 ng L-1 water for 2,6-DCBQ and 2,6-DBBQ. In six local tap waters, 2,6-DCBQ was detected in the range of LOQ-20.5 ng L-1 and no 2,6-DBBQ was detected. The method is recommended for low-cost and rapid determination of 2,6-DCBQ and 2,6-DBBQ in water. (C) 2018 Elsevier Ltd. All rights reserved.
机译：二卤代苯醌是一组具有高潜在毒性的消毒副产物，因此目前受到越来越多的关注。利用液-液萃取和气相色谱法开发了2,6-二氯-1,4-苯醌（2,6DCBQ）和2,6-二溴-1,4-苯醌（2,6-DBBQ）的测定方法电子捕获检测器（LLE-GC-ECD）进行色谱分离。优化的提取条件如下：甲酸与水的体积比为0.005％，Na2SO4用量为200 g L-1，甲基叔丁基醚（MtBE）/水的体积比为1/10，并用MtBE萃取一次。当剂量浓度为0.5-5.0μg L-1时，2,6-DCBQ和2,6-DBBQ的回收率分别为81％-88％和73％-96％。对于2，6-DCBQ和2,6-DBBQ，LLE-GC-ECD方法的定量限（LOQ）为2.4和2.7 ng L-1水。在六个地方的自来水中，检测到的<2的DCBQ在

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