松针样品中多氯联苯的分析方法研究

研究了松针中多氯联苯（PCB）质量比测定方法。用硅胶预处理柱处理样品，加标回收实验结果表明回收率在90％左右。分别测定了不同地区的松针样品中PCB的质量比，据此可评价不同地点的PCB污染程度。样品预处理和分析方法简单、可靠、易行，重现性好。

Gas Chromatographic Method for the Analysis of Polychlorinated Biphenyls in Pine Needles

Polychlorinated biphenyls (PCBs) are a class of 209 chemical compounds, in which 1-10 chlorine atoms are attached to a biphenyl molecule. PCBs are members of halogenated aromatic group of environmental pollutants that have been identified worldwide in diverse environmental matrices. PCBs in air,soils, sediment, water, transformer oils and other environmental matrices have been determined in the past years. In this work a method for routine analysis of PCBs in pine needles has been developed. First,extractions were carried out in Soxhlet apparatus with n-hexane as solvent. Then, a silica gel chromatographic column was applied to pretreat the pine needle samples. The reference standard used was clophen 50. The recovery was about 90%, so the feasibility and reliability were assured. After the analysis of PCBs in pine needle samples from four different regions, the distribution of PCBs in environment can be discussed and monitored. In this method, a Shimadzu GC-7A gas chromatograph equipped with a 63Ni electron capture detector was used for the analysis of PCBs. From the results, we can see the PCB pollution in different regions. So evaluation of air pollution level through foliage data is feasible. The sample preparation and analytical method mentioned in this paper is reliable and simple.