河流底泥沉积物中五氯酚和六氯苯残留的同时测定

建立了冷冻干燥，超声波提取，弗罗里硅土固相萃取净化(Florisil SPE cleanup)，气相色谱-质谱(GC/MS)检测河流底泥沉积物中五氯酚（PCP）和六氯苯（HCB）残留的方法。方法加标回收率在91%~ 99%之间，相对标准偏差小于10%。检测五氯酚和六氯苯的方法检出限（干重）分别为0.038 3 μg/g、0.053 2 μg/g。应用该方法进一步研究了取样点底泥沉积物剖面PCP、HCB含量与总有机碳(TOC)的分布特征。由此推测TOC可能是PCP和HCB在底泥沉积物剖面中沿纵深向下层迁移的一个重要载体。

Simultaneous Determination of Pentachlorophenol and Hexachlorobenzene in River Sediments

A method for the determination of pentachlorophenol (PCP) and hexachlorobenzene (HCB) in river sediments was established. Frozen-dried sediments analytes were pre-treated by ultrasonic wave extraction and acetyl derivation，followed by Florisil solid phase extraction cleanup (Florisil SPE cleanup)，and then detected by gas chromatography-mass spectrometry (GC/MS) finally. The results presented a high accuracy and precision with the mean recoveries fell in 91%~99%, relative standard deviation lower than 10%. Method detection limits (dry weight) were 0.038 3 μg/g, 0.053 2 μg/g for PCP and HCB，respectively. Further more, a research was processed on the vertical distribution of PCP，HCB and total organic carbon (TOC) for the sampling sites. Accordingly, it is deduced that TOC is a possible important carrier of PCP and HCB vertical distribution in river sediments.