Immobilization of trace metals by phosphates in contaminated soil near lead/zinc mine tailings evaluated by sequential extraction and TCLP
Immobilization of trace metals by phosphates in contaminated soil near lead/zinc mine tailings evaluated by sequential extraction and TCLP
复制标题
通过顺序萃取和 TCLP 评估铅/锌尾矿附近污染土壤中磷酸盐对痕量金属的固定作用
DOI：
10.1007/s11368-013-0751-x
复制
发表时间：
2013-07
影响因子：
3.6
通讯作者：
Jin, Zan-Fang
中科院分区：
文献类型：
--
作者：
Wu, Wei-Hong;Xie, Zheng-Miao;Xu, Jian-Ming;Wang, Fan;Shi, Jia-Chun;Zhou, Rong-Bin;Jin, Zan-Fang
目的铅锌矿废弃地周围土壤中Pb、Zn、Cu、Cd、As的复合污染对周围环境构成潜在威胁。需要采取缓解措施来降低环境风险。本文的目的是评估不同形式的磷酸盐修复铅/锌尾矿附近的多金属和砷的复合污染的可行性和效率。材料和方法测试的土壤取自粘土伊利石热型表水层土壤（0-20 cm深）附近的铅和锌尾矿，位于中国浙江省绍兴市。将四种纯化学试剂K2 HPO 4、Ca（H2 PO 4）2·2 H2O、Ca 3（PO 4）2和Ca 5（PO 4）3OH以溶液形式添加到土壤中作为微量金属稳定添加剂，施磷量相当于2，283 mg P/kg-土壤，P/Pb摩尔比为1。结果和讨论在污染土壤中添加K2 HPO 4、Ca 3（PO 4）2、Ca 5（PO 4）3OH和Ca（H2 PO 4）2·2 H2O，283 mg P/kg土壤使TCLP提取液中的Pb浓度分别从90.47降低到56.05、83.80、67.78和86.32 mg/kg（降低38.0、7.36、25.1和4.59%）。连续提取分析表明，磷酸盐处理导致易于利用的微量金属形态转化为更稳定的形式。然而，TCLP As在土壤中的初始值为0.23增加到2.1，0.70，0.67，和0.77 mg/kg，分别为四个处理。K2 HPO 4处理土壤的TCLP可浸出As浓度约为未处理soil.ConclusionsThe除了K2 HPO 4，Ca 3（PO 4）2，Ca 5（PO 4）3OH，和Ca（H2 PO 4）2. 2 H2O是有效的减少水溶性和可交换的铅，锌，铜，镉，并尽量减少TCLP提取的铅，锌，铜。连续萃取试验和TCLP结果表明，Ca 5（PO 4）3OH处理对Pb、Zn、Cu、Cd的固定效果优于其他磷酸盐处理，但对As的迁移率略有提高。
PurposeThe combined contamination of Pb, Zn, Cu, Cd, and As in the soils near lead/zinc mine waste posed a potential threat to the surrounding environment. Mitigation methods are needed to reduce the environmental risk. The aims of this paper were to evaluate the feasibility and efficiency of different forms of phosphates in remediating combined contamination caused by multi-metals and arsenic near the lead/zinc mining tailings.Materials and methodsThe tested soil was taken from a clayey illitic thermic typic epiaquepts soil (depth of 0–20 cm) near a lead and zinc mine tailing, located in Shaoxing, Zhejiang Province, China. Four pure chemical reagents, K2HPO4, Ca(H2PO4)2.2H2O, Ca3(PO4)2, and Ca5(PO4)3OH, were added to the soil in solution form as the trace metal stabilizing additives at a P application rate equivalent to 2,283 mg P/kg-soil and P/Pb molar ratio of 1. Shifts in trace metal speciation were determined using sequential extraction procedures and relative toxicities were evaluated using the standard EPA toxicity characteristic leaching procedure (TCLP).Results and discussionThe addition of K2HPO4, Ca3(PO4)2, Ca5(PO4)3OH, and Ca(H2PO4)2.2H2O in the contaminated soil at the phosphorus application rate 2,283 mg P/kg-soil reduced Pb concentrations in TCLP extraction solution from 90.47 to 56.05, 83.80, 67.78, and 86.32 mg/kg (38.0, 7.36, 25.1, and 4.59% reduction), respectively. Sequential extraction analysis showed that phosphate treatments caused the transformation of easily available trace metal species to more stable forms. However, TCLP As in the soil increased from its initial value of 0.23 to 2.1, 0.70, 0.67, and 0.77 mg/kg, respectively, for the four treatments. The TCLP leachable As concentration of the K2HPO4-treated soil was about nine times of that from the untreated soil.ConclusionsThe addition of K2HPO4, Ca3(PO4)2, Ca5(PO4)3OH, and Ca(H2PO4)2.2H2O were effective in reducing water soluble and exchangeable Pb, Zn, Cu, and Cd, and minimizing TCLP-extractable Pb, Zn, and Cu. The sequential extraction test and the TCLP indicate that Ca5(PO4)3OH treatment has a higher potential in immobilizing Pb, Zn, Cu, and Cd, though a slight enhancement of As mobility, comparing with other phosphate treatments.
登录
查看更多内容
影响因子：
11.4
作者：
Hooper, K;Iskander, M;Simmons, B
通讯作者：
Simmons, B
影响因子：
8.8
作者：
Wong, MH
通讯作者：
Wong, MH
影响因子：
4.2
作者：
McBride, M;Sauve, S;Hendershot, W
通讯作者：
Hendershot, W
影响因子：
11.4
作者：
A. Chlopecka;D. Adriano
通讯作者：
A. Chlopecka;D. Adriano
影响因子：
9.8
作者：
Adamo, P;Arienzo, M;Violante, P
通讯作者：
Violante, P