Rapid determination of trace haloacetic acids in water and wastewater using non-suppressed ion chromatography with electrospray ionization-tandem mass spectrometry
Rapid determination of trace haloacetic acids in water and wastewater using non-suppressed ion chromatography with electrospray ionization-tandem mass spectrometry
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使用非抑制离子色谱电喷雾电离串联质谱快速测定水和废水中的痕量卤乙酸
DOI：
10.1016/j.scitotenv.2020.142297
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发表时间：
2021-02-01
影响因子：
9.8
通讯作者：
Li, Ai-Min
中科院分区：
文献类型：
--
作者：
Cheng, Shi;Wu, Ya-Ping;Li, Ai-Min
建立了非抑制离子色谱-电喷雾电离串联质谱法直接测定水样中痕量卤乙酸的方法。以70/30(v/v)乙腈/1M甲胺水溶液为流动相，分别测定了Thermo-Science的AS16、AS18和AS24三种IC色谱柱，其中以AS16色谱柱的分离性能和保留时间最好。为了评价流动相组成对HAAS保留时间的影响，进一步使用(I)不同比例的乙腈和甲胺水溶液，(Ii)固定甲胺浓度下不同比例的乙腈和水溶液，以及(Iii)固定比例乙腈和水溶液中不同浓度的甲胺来进一步测试AS16色谱柱。在较低比例的水溶液中，van der Waals和/或氢键相互作用似乎在控制HAA的保留中起着重要作用，即由升高的溶剂引起的表观logK(Ow)相对较高的HAAs具有较长的保留时间；而在较高比例的水溶液中，离子相互作用似乎主导了HAAs的保留，极化程度较高的HAa表现出较长的保留时间。采用70/30(v/v)乙腈/1M甲胺水溶液，方法检出限为0.090~0.216 mg/L。最后，将该方法应用于实验室氯化实验中的HAAs生成量监测，并用于自来水和废水出水样品中HAAs浓度的测定。(C)2020年由爱思唯尔出版。
A simple and rapidmethod employing non-suppressed ion chromatographywith electrospray ionization tandem mass spectrometry has been developed for the direct determination of trace-level haloacetic acids (HAAs) in water samples. Using 70/30 (v/v) acetonitrile/1 M aqueous methylamine as the mobile phase, three IC columns - AS16, AS18 and AS24 from Thermo-Scientific - were tested, respectively, with the AS16 column exhibiting the best overall performancewith respect to resolution and retention time. To assess the effects ofmobile phase composition on retention time of HAAs, the AS16 column was further tested using (i) different proportions of acetonitrile to aqueous methylamine, (ii) different proportions of acetonitrile to aqueous solution at fixed methylamine concentrations, and (iii) different concentrations of methylamine at fixed proportions of acetonitrile to aqueous solution. With a low proportion of aqueous solution, van der Waals and/or hydrogen-bonding interactions appeared to play an important role in governing HAA retention, i.e., HAAs with relatively higher apparent logK(ow)* caused by elevated solvents (s)(s)pK(a) exhibited longer retention times; whereaswith a high proportion of aqueous solution, ionic interactions appeared to dominate retention of HAAs, with the more polarizable HAAs exhibiting longer retention times. Using 70/30 (v/v) acetonitrile/1 M aqueous methylamine, the method detection limitswere in the range of 0.090-0.216 mu g/L for the 11 selected chloro-, bromo- and iodoacetic acids. Finally, this method was applied to monitor HAAs yields in laboratory chlorination experiments and to determine concentrations of HAAs in tap water and wastewater effluent samples. (C) 2020 Published by Elsevier B.V.