杭州市西湖区域茶叶和桂花叶中OCPs污染特征

The Pollution Character of OCPs in Tea and Osmanthus Leaves in the West Lake of Hangzhou Area,China

利用气相色谱串联质谱(GC-MS/MS)内标法对夏、冬季杭州西湖区域8个点位的茶叶和桂花叶中10种有机氯农药的含量进行了分析测定。结果表明:杭州西湖区域夏季茶叶ΣOCPs含量范围为0.80～1.21μg·kg-1,平均值为1.01μg·kg-1;冬季ΣOCPs含量范围为1.37～2.85μg·kg-1,平均值为1.99μg·kg-1。夏季桂花叶ΣOCPs含量范围为1.45～13.34μg·kg-1,平均值为5.97μg·kg-1;冬季ΣOCPs含量范围为2.08～8.69μg·kg-1,平均值为4.58μg·kg-1。茶叶和桂花叶中OCPs污染主要来源于环境中早期的残留。OCPs的含量随着季节变化,茶叶中冬季OCPs的含量高于夏季的含量,而桂花叶中夏季高于冬季,表明茶叶中OCPs的变化可用于监测西湖区域大气中OCPs的季节变化规律,而桂花叶片适用于监测连续数年该区域大气中OCPs的污染情况。

The concentrations of ten OCPs in the samples were determined by GC-MS/MS with the internal standard method.The eight sites of tea and osmanthus leaves samples were collected from the West Lake of Hangzhou area in summer and winter.The results showed that the total concentrations of OCPs in tea from the West Lake of Hangzhou area were in the ranges of 0.80～1.21 μg·kg-1（with a mean 1.01 μg·kg-1） in summer and 1.37～2.85 μg·kg-1（with a mean 1.99 μg·kg-1） in winter.The total concentrations of OCPs in osmanthus leaves from the West Lake of Hangzhou area were in the ranges of 1.45～13.34 μg·kg-1（with a mean 5.97 μg·kg-1） in summer and 2.08～8.69 μg·kg-1（with a mean 4.58 μg·kg-1） in winter.OCPs in tea and osmanthus leaves were mainly the early residue in the environment.The concentration of OCPs was seasonal,and the concentration of OCPs in tea in summer was much higher than that of OCPs in winter,but osmanthus leaves was different from tea.The tea was used to monitor the seasonal variation of OCPs in the West Lake of Hangzhou area,and the osmanthus leaves was used to monitor the annual variation of OCPs in this region.