Abstract:
Samples of soils and crops were collected around Xinzhungzi Coal Mine waste rock pile by the intercept method. The concentrations of Zn, Pb, Cd, Cu in the soils and crops were analyzed by inductively coupled plasma optical emission spectrometer (ICP-OES). The results showed that the soil is alkaline, and the max concentrations of Zn, Pb in the soils are 4308 mg·kg-1 and 1561 mg·kg-1 at the depth of 20~40 cm, which are below the background values of Huainan soil. The concentrations of Cd and Cu in the soil with the depths of 0~20 cm and 20~40 cm, respectively, are the highest and 10676% and 046% higher than the background value of Huainan soil. The concentrations of Zn, Pb, Cd, Cu are incorrelate with the depth of soil. The Zn and Pb in the top soil (0~20 cm) reach their peak values at a distance away from the coal mine spoil, which may be caused by the grain from the burst of coal mine spoil transported by the wind. The stepwise regression analysis indicated that total P affects the concentrations of Zn and Pb in soil, and organic matter affects the concentrations of Pb and Cu in soil. Cd accumulates in the roots of soybean and rice, while Zn transports into the aerial parts of the two plants. The enrichments of Zn in the aerial parts of soybean and rice are much higher. The order of Zn, Pb, Cd, Cu enrichments in the leaf, hull and seed of soybean and rice is Zn>Cu>Cd>Pb. The max value of Pb in the grain of rice is 052 mg·kg-1（dry weight）, 13 times higher than the national food hygiene standard. The risk from the Pb in the seed of rice should not be overlooked.
