Effect of slow-release phosphate on stabilization and long-term stability of Zn and Cd in soil

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-06-01 DOI:10.1016/S1003-6326(25)66803-8

Chu-xuan LI , Shan-xin YUAN , Hai-feng LI , Yong-ping LU , Wei-chun YANG , Wen-shun KE , Lu TANG , Chong-jian TANG , William HARTLEY , Sheng-guo XUE

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Abstract

Slow-release phosphate materials were prepared by activating insoluble phosphate with organic acid to stabilize high concentrations of Cd and Zn in contaminated smelter soil. The results showed that oxalic acid (0.1 mol/L) activated tricalcium phosphate (TO-0.1) provided the most efficient stabilization of Cd and Zn. After 30 d treatment, leaching concentrations of Cd and Zn in soil were decreased from 3.17 and 16.60 mg/L to 0.078 and 0.32 mg/L, respectively. The acid-soluble fractions of Cd and Zn were transformed into reducible, oxidizable, and residual fractions. Notably, As mobility in TO-0.1 treated soils did not increase. In addition, acid rain leaching and 150 d of natural aging revealed that the slow-release phosphate material provided long-term stability for the stabilization of Cd and Zn. This study verifies the potential application of slow-release phosphate materials for the remediation of heavy metal contaminated soil at smelting sites.

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缓释磷肥对土壤锌、镉稳定及长期稳定性的影响

采用有机酸活化不溶性磷酸盐制备缓释磷酸盐材料，以稳定污染冶炼厂土壤中的高浓度镉和锌。结果表明，草酸（0.1 mol/L）活化磷酸三钙（TO-0.1）对Cd和Zn的稳定效果最好。处理30 d后，土壤中Cd和Zn的淋溶浓度分别由3.17和16.60 mg/L降至0.078和0.32 mg/L。Cd和Zn的酸溶性组分转化为可还原组分、可氧化组分和残留组分。值得注意的是，在TO-0.1处理的土壤中，As的流动性没有增加。另外，酸雨淋滤和150 d自然老化试验表明，缓释磷酸盐材料对Cd和Zn的稳定具有长期稳定性。本研究验证了缓释磷酸盐材料在冶炼场地重金属污染土壤修复中的潜在应用前景。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.