污灌区土壤理化参数与有机氯农药含量的相关性分析

采用GC—ECD分析了北京东南郊污灌区土壤剖面中有机氯农药（OCPs）的垂向分布特征，并通过SPSS统计分析软件，分析了土壤理化参数与总有机氯含量之间的相关性。结果表明，3个剖面表层总有机氯的含量分别为20．18、30．94、20．19ng·g^-1，检出最高浓度未超出《土壤环境质量标准》限定的50μg·kg^-1，表层以下0．5～5．5m内，有机氯含量基本上不超过1ng·g^-1，表明该研究区有机氯主要累积层位为表层土壤，表层以下各层位间检测浓度相差不大。相关分析结果表明，土壤理化指标CEC、粘粒含量和粘土矿物含量两两之间有极高的相关性，相关系数分别为0．746、0．815、0．851；TOC和含水率是影响有机氯农药垂向迁移的主要因素，回归方程为Y=0．569XTOC-0．632X含水率。

The Relevant Analysis Between the Physical-chemicial Indexes of Soil Samples and the Concents of Organochlorine Pesticides in the Polluted Irrigation Areas

Total 3 borehole profiles samples were collected using Eijkelkamp soil sampler from the wastewater irrigation area of Beijing south- east suburb, and organochlorine pesticides（OCPs） of soil samples were analyzed with GC-ECD. SPSS（statistical program for social sciences） software was used to analyse the relevance between physical--chemical indexes and OCPs contents. Results showed that, the OCPs contents of 3 surface soil samples were 20.18. 30.94 and 20.19 ng .g^-1 respectively, and three of them were lower than the Soil Environmental Quality Standards. Under the surfaces, the detected contents of all the profile soil samples from 0.5 m to 5.5 m were less than 1 ng.g^-1. That＇s to say, the surface soil was the most popular accumulation layer of OCPs. The relevant analysis results showed that, the cation exchange capacity （CEC）, total amount of clay minerals , and clay content（ C ） had high level relevance between each other, the correlation coefficients were 0.746,0.815,0.851 respectively. The total organic compounds（TOC） and the moisture ratio（H） were main factors which decided the distri- bution and transformation of OCPs in the soil profiles, regression equation was ： Y=0.569XTOC-0.632XH.