环境中五氯酚残留检测方法的优化研究

Study on the optimal method for determination of pentachlorophenol residues in environment by GC-μECD

采用GC-μECD建立了一种持久性有机污染物五氯酚在土壤、水及植株中的残留检测方法，并对残留分析的各种条件进行了优化．用石油醚和稀硫酸振荡提取90rain，碳酸钠反萃取后，在pH为9的条件下采用衍生萃取同步处理样品20min，以GC-μECD分离测定．实验结果表明在10-1000μg／L范围内，五氯酚浓度与色谱峰面积有很好的线性关系，其回归方程为Y=-62．71＋11．61X，相关系数为0．9993，检出限为6．18μg／L.该方法的加标回收率为81．7％～99．4％，相对标准偏差1．05％-4．53％，方法简便、快速、灵敏、准确．

A method for determining residues （POPS） pentachlorophenol（PCP） in environment of the persistent organic pollutants was founded by means of GC-μECD. Samples were extracted with petroleum ether and dilute sulphuric acid about 90 minutes by means of vibrating, and re-extracted with sodium carbonate, derivated with acetic anhydride about 20 minutes under the condition of pH 9 and at the same time extracted, finally analyzed by GC-μECD. The recovery rates ranged from 81.7% to 99.4% and RSD varied between 1, 05% and 4.53%. Generally speaking, the method was simple, sensitive, stable, quick and can be used as a routine method for determination of trace PCP in environment.