Effect of Soil Washing with Ferric Chloride on Cadmium Removal and Soil Structure

Dong, Jing1,2; Sun, Qi1; Zhang, Xue3,4; Zhou, Yuan1; Xia, Longchao1; Yuan, Jin1

2021-11-01

10.3390/app112210956

APPLIED SCIENCES-BASEL   影响因子和分区

2076-3417

In China, arable soils contaminated with cadmium (Cd) threaten human health. Ferric chloride (FeCl3) is a highly efficient agent that can remove Cd from contaminated soils. However, it is unknown whether FeCl3 damages the soil structure and consequently affects crop growth. In this study, we investigated the impacts of Cd extraction by FeCl3 on the structure of a paddy soil on the basis of comparisons of control (without washing agents) and hydrochloric acid (HCl) treatments. According to our results, the removal efficiency increased with the decrease in soil initial pH, as adjusted by FeCl3. However, the low pH of 2.0 caused a partial loss of soil mineral components, with an Al release of 4.4% in the FeCl3-treated soil versus 1.3% in the HCl-treated soil. In contrast, the amount of released Al was less than 0.2% in the control and in the FeCl3 treatments with initial pH values of 3.0 and 4.0. The washing agents caused soil TOC loss of 27.1%, 17.5%, and 2.76% in the pH 2.0, 3.0, and 4.0 FeCl3 treatments, compared with 15.5% in the initial pH 2.0 HCl treatment. The use of FeCl3 represents an optimum tradeoff between removal efficiency and the loss of soil components to restore Cd-polluted soils by adjusting the initial pH to 3.0 with the addition of FeCl3. Under this condition, the amount of Al loss was less than 0.2%, and the extraction efficiency reached 40.3%, compared to an efficiency of 39.7% with HCl at an initial pH of 2.0. In conclusion, FeCl3 could effectively remove Cd from contaminated soil.

cadmium pollution ferric chloride soil restoration soil structure

SCI

英语

通讯

Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology[ES201808] ; National Key Research and Development Program Project[2019YFC0408602] ; National Natural Science Foundation of China[21806120] ; Key Research and Development Projects of Shanxi Province[201903D311004] ; Shanxi Province Science Foundation for Youths[201901D211027]

Chemistry ; Engineering ; Materials Science ; Physics

Chemistry, Multidisciplinary ; Engineering, Multidisciplinary ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000724965800001

MDPI

Web of Science

1.Taiyuan Univ Technol, Coll Environm Sci & Engn, Jinzhong 030060, Peoples R China
2.Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
3.Shenyang Acad Environm Sci, Shenyang 110167, Peoples R China
4.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

Dong, Jing,Sun, Qi,Zhang, Xue,et al. Effect of Soil Washing with Ferric Chloride on Cadmium Removal and Soil Structure[J]. APPLIED SCIENCES-BASEL,2021,11(22).

Dong, Jing,Sun, Qi,Zhang, Xue,Zhou, Yuan,Xia, Longchao,&Yuan, Jin.(2021).Effect of Soil Washing with Ferric Chloride on Cadmium Removal and Soil Structure.APPLIED SCIENCES-BASEL,11(22).

Dong, Jing,et al."Effect of Soil Washing with Ferric Chloride on Cadmium Removal and Soil Structure".APPLIED SCIENCES-BASEL 11.22(2021).