Kim Sung Un, Owens Vance N, Kim Yong Gyun, Lee Sang Mong, Park Hyean Cheal, Kim Keun Ki, Son Hong Joo, Hong Chang Oh
Plant Science Department, South Dakota State University, 1110 Rotunda Lane North, Brookings, SD, 57007, USA.
Department of Life Science and Environmental Biochemistry, Pusan National University, Miryang, 627-706, South Korea.
Bull Environ Contam Toxicol. 2015 Nov;95(5):675-9. doi: 10.1007/s00128-015-1621-6. Epub 2015 Aug 5.
The objectives of this study were to determine (1) the phosphorus (P) level required to induce cadmium (Cd) precipitation in a contaminated arable soil with low concentrations of Cd and (2) the primary mechanism of Cd immobilization at different P levels. Phosphorus was added at levels of 0 800, 1600, and 16,000 mg P kg(-1) to a soil containing 5.57 mg Cd kg(-1). The concentration of 1 M NH4OAc extractable Cd decreased significantly with P levels up to 1600 mg kg(-1) due to an increase in soil pH and negative charge of soil (p<0.001). A further decrease in 1 M NH4OAc extractable Cd concentration was noted when P was increased to 16,000 mg P kg(-1) and may have been the result of Cd precipitation. This study suggest that adding P at high levels may help in the formation of geochemically stable Cd minerals in soil containing low levels of this heavy metal.
（1）在镉（Cd）浓度较低的受污染耕地土壤中诱导镉沉淀所需的磷（P）水平；（2）不同磷水平下镉固定的主要机制。向含有5.57 mg Cd kg⁻¹的土壤中添加0、800、1600和16000 mg P kg⁻¹水平的磷。由于土壤pH值和土壤负电荷增加（p<0.001），在磷水平高达1600 mg kg⁻¹时，1 M NH₄OAc可提取镉的浓度显著降低。当磷增加到16000 mg P kg⁻¹时，1 M NH₄OAc可提取镉浓度进一步降低，这可能是镉沉淀的结果。本研究表明，在含有低水平这种重金属的土壤中，高水平添加磷可能有助于形成地球化学稳定的镉矿物。
