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Showing content from https://link.springer.com/doi/10.1007/s00244-009-9363-2 below:

Comparison of Phosphate Materials for Immobilizing Cadmium in Soil

Abstract

A study was conducted to compare the effects of phosphate (P) materials in reducing cadmium extractability. Seven P materials (commercial P fertilizers—fused phosphate (FP), ‘fused and superphosphate’ [FSP], and rock phosphate [RP]; P chemicals—Ca[H2PO4]2·H2O, [NH4]2HPO4, KH2PO4, and K2HPO4) were selected for the test. The selected P source was mixed with Cd-contaminated soil at the rate of 0, 200, 400, 800, and 1,600 mg P kg−1 under controlled moisture conditions at 70% of water holding capacity, then incubated for 8 weeks. FP, Ca(H2PO4)2 ∙ H2O, KH2PO4, and K2HPO4 significantly decreased NH4OAc-extractable Cd (plant-available form) concentrations with increasing application rates. Compared to other phosphate materials used, K2HPO4 was found to be the most effective in reducing the plant-available Cd concentration in soil, mainly due to the negative charge increase caused by soil pH and phosphate adsorption. Contrary to the general information, FSP and (NH4)2HPO4 increased Cd extractability at low levels of P application (<400 mg kg−1), and thereafter Cd extractability decreased significantly with increasing application rate. RP scarcely had an effect on reducing Cd extractability. Ion activity products of CdHPO4, Cd(OH)2, and CdCO3 analyzed by the MINTEQ program were significantly increased by K2HPO4 addition, but the effect of Cd-P compound formation on reducing Cd extractability was negligible. Conclusively, the P-induced alleviation of Cd extractability can be attributed primarily to Cd immobilization due to the increase in soil pH and negative charge rather than Cd-P precipitation, and therefore, alkaline P materials such as K2HPO4 are effective for immobilizing soil Cd.

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Acknowledgment

This study was carried out with the support of the On-Site Cooperative Agriculture Research Project (20070401-080-100-001-01-00), RDA, Republic of Korea.

Author information Authors and Affiliations
  1. Plant Science Department, South Dakota State University, 1110 Rotunda Lane North, Brookings, SD, 57007, USA

    Chang Oh Hong

  2. Department of Bioenvironmental Chemistry, Chungnam National University, 220 Kung-dong, Yousung-ku, Daejeon, 305-764, South Korea

    Doug Young Chung

  3. Department of Crop Sciences, University of Illinois, 1102 S. Goodwin Avenue, Urbana, IL, 61801, USA

    Do Kyoung Lee

  4. Division of Applied Life Science (BK21), Graduate School, Gyeongsang National University, 900, Kaswa-dong, Jinju, 660-701, South Korea

    Pil Joo Kim

  5. Institute of Agriculture and Life Sciences, Gyeongsang National University, 900, Kaswa-dong, Jinju, 660-701, South Korea

    Pil Joo Kim

Authors
  1. Chang Oh Hong
  2. Doug Young Chung
  3. Do Kyoung Lee
  4. Pil Joo Kim
Corresponding author

Correspondence to Pil Joo Kim.

About this article Cite this article

Hong, C.O., Chung, D.Y., Lee, D.K. et al. Comparison of Phosphate Materials for Immobilizing Cadmium in Soil. Arch Environ Contam Toxicol 58, 268–274 (2010). https://doi.org/10.1007/s00244-009-9363-2

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