钢铁工业区周边农业土壤中多环芳烃(PAHs)残留及评价

Residue and risk assessment of polycyclic aromatic hydrocarbons (PAHs) in soils around a steel mill.

对某大型矿业企业周边农业土壤中多环芳烃(PAHs)残留量进行了调查。结果表明,PAHs总残留量范围为312. 2~27 580. 9ng·g-1,且以4环以上多环芳烃组分为主。所有土样中均检出PAHs,单一污染物以芘、艹屈、荧蒽、苯并[a]芘、蒽、菲、苯并[a]蒽、苯并[k]荧蒽、茚并[1,2,3 cd]芘、苯并[g,h,i]苝为主。PAHs残留量与有机质含量相关性较好。不同样区土壤PAHs残留量受常年风向影响明显。以加拿大农业区域土壤PAHs的治理标准值为指标,用内梅罗综合指数法进行评价表明,研究区农业土壤达重污染水平的占37%,中度污染的占19%,轻污染的占25%,另有13%的采样点污染程度处于警戒限,仅有6%的采样点尚处于安全级。

Polycyclic aromatic hydrocarbons (PAHs) in soils around a steel mill were investigated and examined.Results show that PAHs residue in this area ranged between 312.2 and 27 580.9 ng·g^(-1).The PAHs with more than 4 rings were the main pollutants,especially pyrene,chrysene,fluoranthene,benzo(a)pyrene,anthracene,phenanthrene,benzo(a)anthracene,benzo(k) fluoranthene,indeno(1,2,3-cd)pyrene,benzo(g,h,i)perylene,of which the contents were closely related to organic matter of the soils and with direction of the prevailing winds of the year.Evaluation of the soils with the (N.L.)Nemerow composite index and the standard for PAHs management of agricultural soils in Canada showed 37% of the samples reached the level of heavy pollution;19% the level of moderate pollution;25% the level of light pollution;13% the warning limit;and only 6% remained in the grade of safety.