北京燕山石化区土壤苯并(a)芘污染及其环境容量研究

本研究采用网格布点法对燕山石化区农田每一平方公里采集土样,同步采集农作物样品,对其苯并(a)芘进行残留量测定。并把无污染的同类土壤背景值作为评价标准。结果表明,土壤中BaP非污染面积占54.14％,轻度污染占12.27％,中度污染占12.03％,重度污染占21.66％;粮食中BaP的重度污染占43.06％。其污染程度:污灌重于混灌,混灌重于清灌。结合盆栽模拟试验,应用图论工具建立的数学模型,研究了BaP的土壤环境容量。

Study on the Pollution and Environmental Capacity for Soil Benzopyrene (BaP) for Petro- chemical Industry District in Beijing

The soil samples were taken trom each square kilometre of tne farming neld in Yanshang Beijing area of simultaneously with the crop samples to measure the BaP residual amount. The background value(reference point) of non-contaminated soil of the same sort is taken as the appraisal criterion. The results indicate that BaP in the soil of the non-contaminated area occupies 54.14% , of the slightly-contaminated area 12 .27% , of the medium contaminated 12.03%, and of the seriously-contaminated area 21.56% , while that of the serious BaP contamination in grains amounts to 43.06% . As for the contaminated degree, the sewage irrigation is more serious than the mixed irrigation; and the mixed one is more serious than the clean water irrigation. In combination with the pot-planting simulation, the BaP capacity of soil is studied by mathematical model which is established by means of graph theory.