明山煤矿区废弃地重金属污染土壤环境质量评价

为了科学评价广东省明山煤矿区废弃地土壤重金属污染情况,于2010年11月至2011年3月采集明山煤矿区废弃地受重金属污染的5个样点的土壤样品,运用原子吸收分光光度法对土壤中7种重金属元素进行测定。结果表明,①土壤pH为2.87~6.16,土壤较贫瘠。②土壤污染主要是Cd、Mn污染,其中Cd平均含量为2.052 mg/kg（0.759~3.109 mg/kg）,超标严重;Mn平均含量为421.215 mg/kg（387.057~488.660 mg/kg）,污染严重。③从内梅罗综合污染指数看,样点1、样点4、样点5为极重污染,样点2、样点3为中度污染。

煤矿废弃地重金属含量及3种土著先锋植物吸收特征

2010年11月至2011年3月,对广东梅州明山煤矿总厂附近的能发矿堆积场5个土壤采样点及3种土著先锋植物体内7种重金属元素的特征进行分析,结果表明:(1)明山煤矿废弃地土壤土壤pH在2.87～6.16之间;(2)土壤镉含量为0.759～3.109mg/kg,超标严重;铜含量为39.522～270.308 mg/kg,存在一定程度的铜污染,但污染不严重;锰含量为387.057～488.660 mg/kg,锰污染严重;但土壤镍、铅、锌、铬污染较轻或基本没有污染;(3)五节芒体内重金属含量最低,胜红蓟体内重金属含量最高,小飞蓬介于两者之间;所测定的7种元素(镍、镉、铜、铅、锌、锰、铬)中,锰和锌在3种土著先锋植物体内的含量均较大,镉、铬的含量相对较小;(4)3种先锋植物间及植物根茎叶不同部位对土壤重金属的吸收、富集、转移能力是不同的,其中五节芒的富集能力相对较弱而小飞蓬、胜红蓟的富集能力相对较强,其中,小飞蓬、胜红蓟可认为是土壤镉的超富集植物;(5)胜红蓟对镍的转移系数最大,高达398.58%,而五节芒对镉的转移系数最小,仅43.53%;小飞蓬对镉的生物浓缩系数最大,高达3750.36%,胜红蓟对镉、铬的生物浓缩系数均达1 664.54。

Soil Environmental Quality Evaluation for Wasteland of Coalmine Tailing Polluted by Heavy Metals in Mingshan of Guangdong

ln order to appraise scientifical y the heavy metal contamination in waste-land of coalmine tailing in Mingshan of Guangdong, the 5 soil samples in wasteland of coalmine tailing were col ected in November 2010 to March 2011. The 7 heavy metals content in the contaminated soil was measured by atomic absorption spec-trophotometry. The results showed the pH of the wasteland soil ranged from 2.87 to 6.16, and the soil was relatively infertile. The soil was mainly pol uted by Cd and Mn. The Cd content in wasteland soil ranged from 0.759 mg/kg to 3.109 mg/kg with an average content of 2.052 mg/kg, which was much higher than the standard content. The Mn content ranged from 387.057 to 488.660 mg/kg with an average content of 421.215 mg/kg, which was much higher than the standard content. The Nemerow integrated pol ution indexes showed the sample 1, sample 4 and sample 5 were of heavy pol ution, and sample 2 and sample 3 were of moderate pol ution.