【摘要】 多环芳烃(PAHs)是一类重要的全球性有机污染物,研究其不同组分和周围土壤理化参数之间的多尺度空间关系,有助于了解它们在环境中的迁移转化规律,同时也是污染治理的基础。为此在因子克立格方法的基础上,通过多元空间结构分析结果研究了天津表层土壤16种多环芳烃不同组分和土壤理化参数之间的多尺度空间特征。分析结果显示,在所有的空间尺度上,土壤TOC含量均是影响天津地区表层土壤PAHs各组分含量的主要因素,并且它们之间的关系是显著正相关。而土壤粘粒含量和土壤pH值,在空间尺度小于采样间距的情况下,和PAHs各组分含量之间不存在任何相关性,随着空间尺度的增加,它们与PAHs各组分含量的相关性逐渐增强。更多还原

【Abstract】 Polycyclic aromatic hydrocarbons(PAHs)are ubiquitous persistent environmental contaminants generated by natural combustion processes and human activities.PAHs can result in some latent danger to our human being,such as cancer.The spatial relationship study of different PAHs compounds with some soil properties would be helpful to discover the migration pattern in surrounding environment of these PAHs compounds,and provide scientific basis for the selection and program of PAHs harmless process.Based on the 188 sampling data of PAHs in top soil in Tianjin area,the multi-scale spatial relationship of 16 prior PAHs compounds with pH,TOC and Clay were discussed through spatial structure analysis of factorial Kriging.The results of spatial structure analysis showed that the pollution process of topsoil PAHs in Tianjin area could be attributed to three spatial scales:nugget scale(0～5 km),small scale(5～10 km)and large scale(10～55 km),and there existed significant differences in spatial correlations between PAHs compounds and some soil properties at different spatial scales.TOC was the principal factor affecting the concentration of PAHs compounds in topsoil of Tianjin area at different spatial scale.The relationship of PAHs compounds and TOC was positive.No correlation was observed between PAHs compounds and pH or Clay when the spatial scale was less than the sampling distance.The correlation between PAHs compounds and pH or Clay gradually enhanced with the spatial scale increasing.Ant was a special compound among these 16 PAHs compounds in topsoil of Tianjin area,a negative correlation between Ant and pH existed at all the spatial scales,which may connected with the chemical character of Ant.更多还原