沈阳市城郊表层土壤有机污染评价

城市土壤是保护城市环境的一个重要生态屏障.随着有机污染物的“致癌、致畸、致突变”特性被人们所认知,土壤有机污染也逐渐受到人们的重视.在我国目前缺乏相关环境质量标准的背景下,尝试采用因子分析评价法,对沈阳城郊表层土壤有机污染物进行识别,并对土壤有机污染程度进行定量评价与分级.结果表明,苯并(a)芘、滴滴涕、六氯苯和六六六对土壤污染负荷的贡献率最高,是主要的有机污染因子；利用因子分析评价法,34个城郊表层土壤采样点的有机污染评价综合评分在O-224.62之间,以较轻度污染和中度污染为主,评价结果及分级与实际情况基本相符.在此基础上,分析了各类有机污染物的污染来源,对防治城市土壤污染,进而保障居民的食品安全和饮水安全具有重要意义.

Assessment of organic pollution for surface soil in Shenyang suburbs

Urban soils act functionally as an ecological screen in protecting urban environment. As the characteristics of organic pollutants, such as carcinogenic, teratogenic and mutagenic, are perceived by people, a growing attention is paid to soil organic pollution. In the context of lack of relevant environmental quality standard at present in China, we identifyied the surface soil organic pollutants in Shenyang suburbs, evaluated and classified the soil organic pollution quantitatively by factor analysis assessment method. The result shows that benzopyrene, hexachlorobenzene, DDT and BHC have the largest contribution to soil pollution load, and are therefore the main organic pollution factors. Then the factor analysis assessment method is applied, and the organic pollution assessment overall scores of the 34 suburb surface soil sample stations are in the range of 0-224.62, mainly slight and moderate pollution. Results of the evaluation and classification basically consistent with the actual situation. On this basis, we analyzed the main sources of organic pollutants in surface soils, which is of significance in preventing and controlling the organic pollution of the soils, thus ensuring food and water safety.