废旧电容器封存点土壤中多氯联苯的残留特征

摘要

Residue characteristics of 19 PCBs( ingcluding 7 indicative PCBs and 12 dioxin-like PCBs ) in soils from a storage site of used capacitors in the Yangtze River Delta were investigated by using the Gas Chromatography-Mass Spectrometry using selected ion monitoring ( GC-MS-SIM ) analysis technique. The results of the statistical analysis indicate that the concentrations of X19PCBs in the soils range from 2. 01 to 5201. 20 ng/g, with the average concentration being 229.38 ng/g, which is much higher than common soils but distinctly lower than some storage site soils in China. 85.43% of Σ19PCBs were 3 ~5 chlorinated biphenyls in soils, which is dominated by tri-PCB 28, tetra-PCB 52 and penta-PCB 118. By comparison, PCBs in soils were Aroclor 1242, Aroclor 1248 and little Aroclor 1254. Although the PCBs residues are under control values, attention should be paid to PCBs pollutions in soils in the area, and further measures should be taken to prevent the pollutions from expanding.%利用气相色谱-质谱联用法(GC-MS)研究了长江三角洲某废旧电容器封存点土壤中多氯联苯(PCBs)的残留特征.利用GC-MS的选择离子监测模式(SIM)对包括7种指示性PCBs和12种类二噁英PCBs共19种PCBs进行分析.统计结果显示,该封存点土壤中19种PCBs含量为2.01～5201.20 ng/g,平均含量为229.38 ng/g,明显高于国内一般土壤,但低于国内某些封存点土壤.土壤中19种PCBs同系物以低氯代(3～5氯)为主,三者占同系物总量的85.43%,尤以三氯代-PCB 28、四氯代-PCB 52和五氯代-PCB 118残留量最高.通过对比分析得出,封存点土壤PCBs以Aroclor 1242、Aroclor 1248为主,并含少量的Aroclor 1254.封存点土壤中PCBs残留量虽未超过控制值,但已呈现污染迹象,应及时采取控制措施,阻止污染趋势进一步扩大.