摘要
在河北省境内采集207个表层土壤样品,测定其中的七氯含量。结果表明,表土中七氯含量为0.297ng·g-1±0.026ng·g-1。浓度数据呈典型的对数正态分布,几何均值及标准差为0.118ng·g-1±1.113ng·g-1,此浓度范围不会通过农作物吸收对人体健康造成影响。河北境内各市土壤中七氯含量存在显著差异。实测浓度较高的秦皇岛-唐山一带、保定西部和张家口西南部等地主要与土壤有机质含量较高有关。经土壤有机碳含量标化后,沧州土壤中七氯的浓度最高,其次为廊坊和衡水。作为20世纪80年代农业施用的残留,不同地区的浓度差异与大豆、高梁等作物的栽培面积有关。
207 top soil samples were collected from Hebei province and the contents of heptachlor were measured. The concentration of hep- tachlor averaged 0.297ng·g^-1, with the standard deviation 0.026 ng·g^-1, and fitted with typical log-normal frequency distribution with the geometric mean and standard deviation （0.118±1.113） ng·g^-1. It is believed that heptachlor in the soils resulted from the agricultural applications in 1980＇s or earlier, and the present pollution status imposed no threat to human health in terms of food production, Significant differences were observed among the eleven municipal areas. The relatively higher concentrations in the soils occurred at Qinhuangdao-Tangshan zone, western Baoding, southwestern Zhangjiakou, due to the higher contents of soil organic carbon （TOC） in these areas. After normalization with soil TOC, a higher level region stretched from Qinhuangdao to Hengshui at the eastern part of Hebei Province with the highest value at Cangzhou. The historical input of heptachlor with spatial variation of concentration was likely related to the local production areas of soybean and sorghum.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第1期230-234,共5页
Journal of Agro-Environment Science
基金
国家自然科学基金(40571140/40032015/40021101)
河北省环境科技攻关计划(200402)
关键词
土壤
七氯
持久性有机污染物
空间分异
soil
heptachlor
persistent organic pollutants
spatial variation
