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嘉兴市区加油站周边土壤中重金属铅的分布特征及影响评价

Keywords: 加油站,土壤,,污染指数,评价

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Abstract:

在嘉兴市区11个加油站周边采集了表层土壤样品(0~20cm),以硝酸-盐酸-氢氟酸构成三元酸系统,采用微波消解法预处理土壤样品,火焰原子吸收分光光度计法测定土壤中的铅含量,运用单因子污染评价法对该区域土壤重金属污染水平进行了评价.监测数据显示,嘉兴市区加油站周边表层土壤中铅的含量为20.5~40.6mg/kg,平均值为31.6mg/kg.以国家土壤环境质量标准一级标准作为评价标准时,土壤中铅污染指数变化范围为0.59~1.16,表明各加油站周边土壤中,只有少数点位显示轻度铅污染状况.本实验又对加油站周边土壤中重金属铅含量和土壤pH值、土壤有机质、周边车流量和建站年限等因素进行了关联分析.结果表明,周边车流量与土壤中铅含量相关性较高,相关系数为0.88,建站年限其次,相关系数为0.22,而与土壤的pH值、土壤有机质相关关系不明显.

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