State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Environ Pollut. 2019 Sep;252(Pt A):196-204. doi: 10.1016/j.envpol.2019.05.115. Epub 2019 May 23.
Solid phase extraction has been increasingly applied for the detection of organic micropollutants (OMPs). However, time-consuming and high-cost disadvantages also limit the widespread use of this method, especially for the extraction of large-volume field water samples. In this study, a gas chromatography-mass spectrometry (GC-MS) method based on the magnetic microsphere (M150) solid-phase-extraction (MSPE) was established to investigate the OMPs in source water throughout the whole Huai River. In brief, the results demonstrated that the extraction efficiency of the M150 was superior to that of C and HLB for the selected OMPs, including species of polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs), phthalate esters (PAEs) and nitrobenzenes (NBs), and the method detection limits of M150 for these OMPs were comparable to those of C and HLB. The optimized conditions of extraction and elution were the 100 mg/L dosages of microspheres, extraction time of 60 min and pH of 2, and the eluent with a similar polarity, hydrophobicity and molecular structure to the OMPs rendered higher elution efficiencies. A total of 21 types of OMPs affiliating to PAHs, OCPs, PAEs and NBs were detected by the established method, with the total concentrations of 505-2310 ng/L in source water of the Huai River. Spatial differences of the OMPs were also observed, demonstrating the link between pollutant profiles and geographical locations. This study provides an alternative to enrich OMPs in filed water samples, and it reveals pollutant profiles of source water throughout the whole Huai River.
固相萃取已越来越多地应用于检测有机微量污染物（OMPs）。然而，该方法耗时且成本高的缺点也限制了其广泛应用，特别是对于大体积野外水样的提取。本研究建立了一种基于磁性微球（M150）固相萃取（MSPE）的气相色谱-质谱（GC-MS）方法，用于调查整个淮河流域水源中的 OMPs。简而言之，结果表明，对于所选的 OMPs，包括多环芳烃（PAHs）、有机氯农药（OCPs）、邻苯二甲酸酯（PAEs）和硝基苯（NBs），M150 的萃取效率优于 C 和 HLB，且 M150 对这些 OMPs 的方法检测限与 C 和 HLB 相当。萃取和洗脱的最佳条件是微球剂量为 100mg/L、萃取时间为 60min 和 pH 值为 2，与 OMPs 具有相似极性、疏水性和分子结构的洗脱液具有更高的洗脱效率。通过建立的方法共检测到 21 种 OMPs，归属于 PAHs、OCPs、PAEs 和 NBs，淮河流域水源中的总浓度为 505-2310ng/L。还观察到 OMPs 的空间差异，表明污染物特征与地理位置之间存在联系。本研究为野外水样中 OMPs 的富集提供了一种替代方法，并揭示了整个淮河流域水源的污染物特征。
