College of Resources and Environment, Huazhong Agricultural University, Wuhan, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, China.
College of Resources and Environment, Huazhong Agricultural University, Wuhan, China; Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture, China.
Ecotoxicol Environ Saf. 2019 Jun 15;174:401-407. doi: 10.1016/j.ecoenv.2019.02.076. Epub 2019 Mar 6.
The contamination of soil by copper (Cu) and lead (Pb) is a serious concern because of its high health risk via the food chain. Oxalic acid-activated phosphate rock (APR) and bone meal (BM) were applied to Cu and Pb co-contaminated soil to investigate their efficacy in the immobilization of Cu and Pb. APR and BM were applied into the contaminated soil (158.8 mg/kg total Pb and 573.2 mg/kg Cu) at four levels of dosages (0.1%, 0.5%, 2%, and 4%) and incubated for one year. The results demonstrated that the acid exchangeable Pb fraction in the soil treated with APR and BM decreased compared to the control, while there was no noticeable change in the acid-exchangeable Cu fraction in the soil treated with either APR or BM. Meanwhile, the application of BM and APR increased the fraction of residual Cu and Pb in the polluted soils. Moreover, the addition of either APR or BM at the dose of 4% decreased the concentrations of CaCl-extractable Cu and Pb in the amended soil, and the percentages of that reduction in the APR amended soils were 56% and 91% and in BM amended soils were 67% and 64%, respectively. The immobilization of Cu and Pb by APR and BM might be induced by the increased soil pH and soluble P contents in the amended soils. In general, BM is more effective than APR on the immobilization of Cu in polluted soil, while APR had greater efficiency than BM on the immobilization of Pb when the levels of amendments were above 2%.
土壤中铜（Cu）和铅（Pb）的污染是一个严重的问题，因为它们通过食物链会对健康造成高度风险。草酸活化磷矿（APR）和骨粉（BM）被应用于 Cu 和 Pb 复合污染土壤，以研究它们对 Cu 和 Pb 固定的效果。APR 和 BM 以四个剂量水平（0.1%、0.5%、2%和 4%）施用于污染土壤（总 Pb 为 158.8mg/kg，Cu 为 573.2mg/kg），并培养一年。结果表明，与对照相比，用 APR 和 BM 处理的土壤中酸可交换态 Pb 分数降低，而用 APR 或 BM 处理的土壤中酸可交换态 Cu 分数没有明显变化。同时，BM 和 APR 的应用增加了污染土壤中残余 Cu 和 Pb 的分数。此外，在 4%的剂量下添加 APR 或 BM 降低了改良土壤中 CaCl 可提取 Cu 和 Pb 的浓度，APR 改良土壤中这一降低的百分比分别为 56%和 91%，BM 改良土壤中分别为 67%和 64%。APR 和 BM 对 Cu 和 Pb 的固定可能是由于改良土壤中 pH 值和可溶性 P 含量的增加所致。总的来说，BM 在固定污染土壤中的 Cu 方面比 APR 更有效，而 APR 在添加量高于 2%时对 Pb 的固定效率高于 BM。
