中文摘要：

用GC-ECNI—MS测定了崇明岛土壤中24种中链氯化石蜡（MCCPs）同类物组的含量．目的是了解该地区土壤中MCCPs的污染水平、空间分布、组成特征和来源．结果表明MCCPs在崇明岛土壤中普遍存在，浓度范围为2．56～96．3ng·g-1，中值为7．32ng·g-1．聚类分析将所有样品分为两类．大多数土壤样品MCCPs以C14-MCCPs和C15-MCCPs为主要碳同类物组，分别占29．8％和28．9％；Cl5-MCCPs和C16-MCCPs为主要氯同类物组，分别占29．9％和23．3％；个别样品中，C矿MCCPs是主要碳同类物组，占68．5％，与CP-52的组成相似．大气沉降和土壤-大气交换可能是崇明岛土壤中MCCPs主要来源，个别点可能受到污水处理厂污泥或其他不明污染源的污染．MCCPs与TOC之间没有显著统计相关性．因子分析表明4种MCCPs的碳同类物组具有相似的来源．与国内外其它研究相比，崇明岛土壤中MCCPs处于较低水平．

英文摘要：

In order to understand the contents, spatial distribution and sources of medium-chain chlorinated paraffins （MCCPs） in the soils from Chongming Island, the concentrations of MCCPs in 27 soil samples were analyzed by GC-ECNI-MS. The total concentrations of MCCPs （ ∑ MCCPs） in all samples ranged from 2. 56-96.3 ng.g-1, with a median of 7.32 ng.g-1 All soil samples were classified into two categories by cluster analysis. C14-MCCPs and C15-MCCPs, and C15-MCCPs and C16-MCCPs were the most predominant carbon and chlorine congener groups in most of the samples, accounting for 29.8% and 28.9% , and 29.9% and 23.3% , respectively. C14-MCCPs were the most predominant carbon congener groups in some samples, accounting for 68.5% , which was similar to that of CP-52. Atmospheric deposition and soil-air exchange were the major sources of MCCPs for soils in Chongming. Soils at a few sites were probably contaminated by sewage sludge from sewage treatment plants （STPs） or other unidentified source. No significant correlations were observed between MCCPs and TOC. The correlation analysis also showed significant correlation among the carbon congener groups of MCCPs, which suggested that MCCP congener groups might have been derived from similar sources. Compared to other studies at home and abraod, the MCCPs concentrations in the present study were at a lower level.