水体沉积物中16种优控PAHs的快速萃取

A device for the rapid extraction of 16 priority PAHs in aquatic sediments

本研究设计了一种基于有机提取溶剂进行气态萃取水体和沉积物中有机污染物的快速萃取装置,通过开展空白加标、基质加标以及环境样品重复性验证来确定该装置对水体沉积物中16种优控PAHs的前处理效果.结果表明,16种优控PAHs基质加标的回收率为80%—120%,相对标准偏差(RSD)小于20%,符合US EPA的要求.重复性验证结果显示萃取湖泊沉积物中16种优控PAHs总量(ΣPAHs)的RSD小于10%,河流沉积物的RSD小于20%.该装置具有处理时间短(2h)、对低环PAHs提取效率高(80%—100%)、可批量化处理等特点.本研究萃取装置在萃取时间和试剂消耗方面均优于索氏提取;而在装置操作简便性和分析成本方面也优于微波辅助萃取、加速溶剂萃取.为不同类别有机污染物的同步前处理应用提供了的可能,从而为研究污染物的"复合污染效应"提供技术支持.

A device for the rapid extraction of organic contaminants solvent and target organic pollutants in aquatic sediments was designed and tested in this study. Taking 16 priority polycyclic aromatic hydrocarbon (PAHs) as the target analytes, a series of experiments, including method detection limits and laboratory method blanks of each target, laboratory fortified blank, recoveries of targets in fortified water and sediment samples and duplicate extraction in aquatic sediments, were conducted to verify the extraction efficiency of the 16 priority PAHs by the device. The results showed that the average recovery for 16 the priority PAHs was between 80% and 120%, and the relative standard deviation (RSD) was less than 20%, which meet the requirements of United States Environmental Protection Agency (US EPA). The RSD for 16 total priority PAHs (ΣPAHs) in lake sediments was found to be less than 10%, while that of the river sediments' was less than 20%. The device was characterized by efficiently extracting organic targets (80%-100% for low rings PAHs) in short time (only for 2 h) on a large scale. This device was superior to Soxhlet extraction in terms of extraction time and reagent consumption and also was superior to microwave assisted extraction (MAE) and supercritical fluid extraction (SFE) in terms of easy operation and low analysis cost. This device may also have the possibility of synchronously extracting different types of organic pollutants, which could provide a technical support for exploring the ecological effect of compound pollution in aquatic environment.