Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Key Laboratory of Vegetables Quality and Safety Control, Laboratory of Quality & Safety Risk Assessment for vegetable Products, Ministry of Agriculture and Rural Affairs of China, Beijing 100081, China.
School of Life Science and Food Engineering, Hebei Engineering University, Handan 056000, China.
Molecules. 2019 Jul 29;24(15):2758. doi: 10.3390/molecules24152758.
As persistent organic pollutants, dichlorodiphenyltrichloroethanes (DDTs) and their metabolites pose considerable risks to human health and the environment. Therefore, monitoring DDTs in the environment is essential. Here, we developed a green, simple, and effective magnetic solid-phase extraction (MSPE) method coupled with gas chromatography tandem triple-quadrupole mass spectrometry to determine the DDT content of environmental water samples. A magnetic ionic liquid (IL) adsorbent was developed based on a modified magnetic multiwalled carbon nanotube/zeolitic imidazolate framework-8 (MM/ZIF-8/IL), synthesized by immobilizing the IL on the surface of MM/ZIF-8. We confirmed successful synthesis of MM/ZIF-8/IL by material characterization, and our results suggested that the MM/ZIF-8/IL had a high Brunauer-Emmett-Teller surface area (159.9 m g), good thermostability (<800 °C), and a high degree of superparamagnetism (52.9 emu g). Several experimental conditions affecting the MSPE efficiency were optimized. Under the best conditions, good detection linearity was achieved (0.5-500 µg L) with determination coefficients ranging from 0.9927 to 0.9971. The lower limits of detection (0.0016-0.0072 µg L) also had good precision, having an intraday relative standard deviation (RSD) ≤ 6.5% and an interday RSD ≤ 8.9%. Finally, we used the as-developed method to determine DDT levels in environmental water samples.
作为持久性有机污染物，滴滴涕（DDTs）及其代谢物对人类健康和环境构成了相当大的风险。因此，监测环境中的 DDTs 是至关重要的。在这里，我们开发了一种绿色、简单、有效的磁固相萃取（MSPE）方法，结合气相色谱串联三重四极杆质谱法，用于测定环境水样中的 DDT 含量。基于修饰后的磁性多壁碳纳米管/沸石咪唑骨架-8（MM/ZIF-8），我们开发了一种磁性离子液体（IL）吸附剂，将 IL 固定在 MM/ZIF-8 表面。通过材料特性的表征，我们确认了 MM/ZIF-8/IL 的成功合成，并且我们的结果表明 MM/ZIF-8/IL 具有高的 Brunauer-Emmett-Teller 表面积（159.9 m g）、良好的热稳定性（<800 °C）和高的超顺磁性（52.9 emu g）。优化了影响 MSPE 效率的几个实验条件。在最佳条件下，获得了良好的检测线性度（0.5-500 µg L），测定系数范围为 0.9927 至 0.9971。较低的检测限（0.0016-0.0072 µg L）也具有良好的精密度，日内相对标准偏差（RSD）≤6.5%，日间 RSD≤8.9%。最后，我们使用所开发的方法测定了环境水样中的 DDT 水平。
