广西八一锰矿区土壤和主要农作物重金属含量的研究

对广西八一锰矿废弃地土壤基本理化性质及重金属全量(浓HC l 浓HNO3 HF HC lO4消解)、有效态含量(0.1MHC l浸提)和主要农作物重金属含量(浓HNO3 HC lO4消解)进行了测定(AA S)。结果表明:土壤营养缺乏和重金属污染是本矿区生态恢复面临的主要问题。土壤中全磷和全氮含量低于正常指标,且部分C/N比值偏高,同时土壤存在严重的Cd污染,并可能受到M n污染。在锰矿恢复区种植的主要农作物中,部分样品中Pb、M n含量与全部样品的C r、Cd含量超出了植物正常含量范围。农作物的食用部分中Cd、C r、Pb含量普遍超过国家食品限量卫生标准,不宜食用。

Heavy metal concentrations in soils and main agronomic crops in restored Bayi manganese mine, Guangxi

The heavy metal content of soil and main agronomic crops were tested in the Bayi manganese mine in Guangxi.The results showed that nutrient deficiency and heavy metal pollution were the major constraints on revegetation of mine land.The content of total N and total P were at a relatively low level but C/N ratios were higher in the soil.The mine soils were heavily contaminated by Cd and probably contaminated by Mn.Among the tested agronomic crops,Pb and Mn content in some plant tissues were above the normal range and Cr and Cd content in all plant tissues exceeded normal range.Heavy metal content(Cd,Cr and Pb) in the edible parts of the agronomic crops universally exceeded the prescribed values by the national foodstuff safety standards,and thus they are not suitable for consumption.