2017 Volume 11 Issue 9
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WEI Jia, LI Qusheng, XU Zhimin, ZHOU Xuefang, YANG Yaoshuai, CHEN Kehan, LIN Xin. Mobilization effects of various organic acids on cadmium carbonate in soil[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5298-5306. doi: 10.12030/j.cjee.201612218
Citation: WEI Jia, LI Qusheng, XU Zhimin, ZHOU Xuefang, YANG Yaoshuai, CHEN Kehan, LIN Xin. Mobilization effects of various organic acids on cadmium carbonate in soil[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5298-5306. doi: 10.12030/j.cjee.201612218
shu

Mobilization effects of various organic acids on cadmium carbonate in soil

  • 1.

    Key Laboratory of Environmental Exposure and Health of Guangzhou City, School of Environment, Jinan University, Guangzhou 510632, China

  • 2.

    Guangdong Provincial Research Center of Environmental Pollution Control and Remediation Material, Guangzhou 510632, China

  • Received Date: 25/04/2017
    Accepted Date: 29/12/2016
    Available Online: 26/08/2017
    Fund Project:
  • This paper investigated the impact of 44 organic acids on mobilization of cadmium carbonate. The impact of five organic acids with best performance on Cd mobilization in garden soil was also examined. The results showed that the mobilization ability of low molecular weight organic acids (LMWOAs), phenolic acids (PAs) and amino acids (AAs) on cadmium carbonate were significantly different. The mobilization ability of LMWOAs was stronger than PAs and AAs. The mobilization rates of oxalic acid and citric acid were 7.48% and 7.06%, respectively. Based on equivalent molarity of organic acid, the mobilized Cd by citric acid was 22.73 mg·L-1, followed by malic acid and cis-aconitic acid, which were 14.55 mg·L-1 and 12.75 mg·L-1, respectively. The effect of PAs mobilization is not obvious. Among AAs, the mobilization effect of aspartic acid, histidine and glutamate was relatively strong and the rest were not significant. The main mechanism of Cd mobilization by citric acid was complexing, while the acid-soluble effect mainly contributes to Cd mobilization by oxalic acid. The citric acid with strongest ability to cadmium carbonate mobilization also had strongest ability to mobilize Cd in sewage-irrigated soil, and its mobilized Cd concentration reached the level of food safety risk.
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Mobilization effects of various organic acids on cadmium carbonate in soil

  • Received Date: 25/04/2017
  • Accepted Date: 29/12/2016
  • Available Online: 26/08/2017
Fund Project:

Abstract: This paper investigated the impact of 44 organic acids on mobilization of cadmium carbonate. The impact of five organic acids with best performance on Cd mobilization in garden soil was also examined. The results showed that the mobilization ability of low molecular weight organic acids (LMWOAs), phenolic acids (PAs) and amino acids (AAs) on cadmium carbonate were significantly different. The mobilization ability of LMWOAs was stronger than PAs and AAs. The mobilization rates of oxalic acid and citric acid were 7.48% and 7.06%, respectively. Based on equivalent molarity of organic acid, the mobilized Cd by citric acid was 22.73 mg·L-1, followed by malic acid and cis-aconitic acid, which were 14.55 mg·L-1 and 12.75 mg·L-1, respectively. The effect of PAs mobilization is not obvious. Among AAs, the mobilization effect of aspartic acid, histidine and glutamate was relatively strong and the rest were not significant. The main mechanism of Cd mobilization by citric acid was complexing, while the acid-soluble effect mainly contributes to Cd mobilization by oxalic acid. The citric acid with strongest ability to cadmium carbonate mobilization also had strongest ability to mobilize Cd in sewage-irrigated soil, and its mobilized Cd concentration reached the level of food safety risk.

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