Quantification of ultra-trace organolead species in environmental water by inductively coupled plasma mass spectrometry with online solid-phase extraction and high performance liquid chromatographic separation.
Quantification of ultra-trace organolead species in environmental water by inductively coupled plasma mass spectrometry with online solid-phase extraction and high performance liquid chromatographic separation.
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DOI：
10.1016/j.aca.2020.07.046
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发表时间：
2020-10
影响因子：
6.2
通讯作者：
Shiwei Yang;Yihuan Song;Qingfang Ma;Heyong Cheng;Yuan-chao Wang;Jinhua Liu
中科院分区：
文献类型：
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作者：
Shiwei Yang;Yihuan Song;Qingfang Ma;Heyong Cheng;Yuan-chao Wang;Jinhua Liu
由于有机铅的毒性和生物利用度远高于无机铅离子，因此对环境水体中有机铅化合物的定量分析是一项重要的任务。然而，在低于ng L− 1水平的超痕量有机铅化合物的形态分析对于目前的仪器是具有挑战性的，这些仪器结合了高效液相色谱和电感耦合等离子体质谱（HPLC-ICP-MS），甚至离线富集，提供了几到几十ng L−1的检测限。建立了在线固相萃取-高效液相色谱-电感耦合等离子体质谱联用分析水中痕量铅形态的方法。氧化石墨烯结合的二氧化硅颗粒（GO@SiO2）被用作SPE吸附剂，因为其上级性能优于石墨烯结合的二氧化硅颗粒和商业C18填充颗粒。当10 mL样品中的铅物种被1 mM十二烷基苯磺酸钠（SDBS）预处理的GO@SiO2以10 mL min− 1吸附，然后用5 μL 5 mM SDBS洗脱时，获得高富集因子（TML为1603，TEL为1376）。由于高效的预浓缩，TML和TEL的检测限分别降至0.018 ng L − 1和0.023 ng L− 1，相对标准偏差低于5%。此外，所提出的方法还通过使用绿色移动的相（pH 2.5的5 mM 1-戊磺酸钠水溶液，有/没有4 mM四丁基氢氧化铵）快速分离Pb（II）、TML和TEL（8 min）。在成功应用于淡水后，TML和TEL仅存在于河水中，而Pb（II）仅存在于自来水中，沿着良好的加标回收率（93-106%）验证了准确性。
Quantification of organolead compounds in environmental water is an essential task considering much higher toxicity and bioavailability of organolead species than inorganic plumbic ions. However, the speciation of ultra-trace organolead compounds at sub ng L−1levels is challengeable for current instruments incorporating high performance liquid chromatography with inductively coupled plasma mass spectrometry (HPLC-ICP-MS) and even offline enrichment that offer detection limits around several to tens of ng L−1. In this paper, an online solid-phase extraction (SPE) coupled HPLC-ICP-MS method was developed for speciation analysis of trace lead in water. Graphene oxide bounded silica particles (GO@SiO2) was utilized as the SPE adsorbent because of its superior performance over graphene bounded silica particles and commercial C18packing particles. High enrichment factors (1603 for TML and 1376 for TEL) were obtained when lead species in 10 mL sample was adsorbed by 1 mM sodium dodecyl benzene sulfonate (SDBS) preconditioned GO@SiO2at 10 mL min−1and then eluted by 5 μL of 5 mM SDBS. Because of the highly efficient preconcentration, detection limits were downscaled to be 0.018 for TML and 0.023 ng L−1for TEL with relative standard deviations below 5%. Additionally, the proposed method also yielded rapid separation of Pb(II), TML and TEL (8 min) by using green mobile phases (aqueous solutions of 5 mM sodium 1-pentanesulfonate at pH 2.5 with/without 4 mM tetrabutylammounium hydroxide). Upon successful application to fresh water, TML and TEL were only presented in the river water whereas Pb(II) was only existed in the tap water, along with accuracy validation by good spiked recoveries (93–106%).