State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China,
Environ Sci Pollut Res Int. 2015 Aug;22(15):11387-400. doi: 10.1007/s11356-015-4289-x. Epub 2015 Mar 27.
A gas chromatography/mass spectrometry (GC/MS)-based method was developed for simultaneous determination of triclosan (TCS) and its degradation products including 2,4-dichlorophenol (2,4-DCP), 2,8-dichlorodibenzo-p-dioxin (2,8-DCDD), and methyl triclosan (MTCS) in wastewater and sludge samples. The method provides satisfactory detection limit, accuracy, precision and recovery especially for samples with complicated matrix such as sewage sludge. Liquid-liquid extraction and accelerated solvent extraction (ASE) methods were applied for the extraction, and column chromatography was employed for the sample cleanup. Analysis was performed by GC/MS in the selected ion monitoring (SIM) mode. The method was successfully applied to wastewater and sludge samples from three different municipal wastewater treatment plants (WWTPs). Satisfactory mean recoveries were obtained as 91(±4)-106(±7)%, 82(±3)-87(±4)%, 86(±6)-87(±8)%, and 88(±4)-105(±3)% in wastewater and 88(±5)-96(±8)%, 84(±2)-87(±3)%, 84(±7)-89(±4)%, and 88(±3)-97(±5)% in sludge samples for TCS, 2,4-DCP, 2,8-DCDD, and MTCS, respectively. TCS degradation products were detected based on the type of the wastewater and sludge treatment. 2,8-DCDD was detected in the plant utilizing UV disinfection at the mean level of 20.3(±4.8) ng/L. 2,4-DCP was identified in chemically enhanced primary treatment (CEPT) applying chlorine disinfection at the mean level of 16.8(±4.5) ng/L). Besides, methyl triclosan (MTCS) was detected in the wastewater collected after biological treatment (10.7 ± 3.3 ng/L) as well as in sludge samples that have undergone aerobic digestion at the mean level of 129.3(±17.2) ng/g dry weight (dw).
建立了一种基于气相色谱/质谱（GC/MS）的方法，用于同时测定废水中的三氯生（TCS）及其降解产物，包括 2,4-二氯苯酚（2,4-DCP）、2,8-二氯二苯并-对-二恶英（2,8-DCDD）和甲基三氯生（MTCS）以及污泥样品。该方法对污水污泥等复杂基质的样品具有令人满意的检测限、准确度、精密度和回收率。采用液液萃取和加速溶剂萃取（ASE）方法进行萃取，采用柱层析法进行样品净化。采用气相色谱/质谱在选择离子监测（SIM）模式下进行分析。该方法成功应用于三个不同城市污水处理厂（WWTP）的废水和污泥样品。在废水中，TCS、2,4-DCP、2,8-DCDD 和 MTCS 的平均回收率分别为 91(±4)-106(±7)%, 82(±3)-87(±4)%, 86(±6)-87(±8)%, 和 88(±4)-105(±3)%, 在污泥中，TCS、2,4-DCP、2,8-DCDD 和 MTCS 的平均回收率分别为 88(±5)-96(±8)%, 84(±2)-87(±3)%, 84(±7)-89(±4)%, 和 88(±3)-97(±5)%. 根据废水和污泥处理的类型，检测到了 TCS 的降解产物。在利用紫外线消毒的工厂中，2,8-DCDD 的检出浓度为 20.3(±4.8)ng/L。在采用氯消毒的化学增强一级处理（CEPT）中检测到 2,4-DCP，其浓度为 16.8(±4.5)ng/L）。此外，在经过生物处理的废水中检测到甲基三氯生（MTCS）（10.7 ± 3.3 ng/L），在经过好氧消化的污泥样品中也检测到甲基三氯生（MTCS）（129.3(±17.2)ng/g 干重（dw））。
