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Mercapto-palygorskite efficiently immobilizes cadmium in alkaline soil and reduces its accumulation in wheat plants: A field study.
- Source :
- Ecotoxicology & Environmental Safety; Nov2023, Vol. 266, pN.PAG-N.PAG, 1p
- Publication Year :
- 2023
-
Abstract
- Cadmium (Cd) contamination in wheat fields has become a major environmental issue in many regions of the world. Mercapto-palygorskite (MPAL) is a high-performance amendment that can effectively immobilize Cd in alkaline wheat soil. However, MAPL as an in-situ Cd immobilization strategy for alkaline wheat soil remains to be evaluated on a field-scale and the underlying mechanisms requires further evaluation. Here, MPAL were used as soil amendment to evaluate their immobilization efficiency on Cd-contaminated alkaline soil in the field experiments. The field experiments showed that MPAL application significantly reduced wheat grain Cd concentration from 0.183 mg/kg to 0.056 mg/kg, with Cd concentration in wheat grain treated with MPAL all falling below the limit value of 0.1 mg/kg as defined in China's food safety standard (GB 2762–2022). The maximal immobilization efficiency of MPAL on soil Cd figured out by diethylenetriaminepentaacetic acid (DTPA) extraction was 61.5%. The mechanisms involved in Cd immobilization by MPAL were mainly related to the enhanced sorption of Cd onto Fe oxides, and the removal of amorphous or free Fe oxides from soil had a substantial impact on Cd immobilization efficiency by MPAL. Furthermore, the antagonistic effect between Mn and Cd uptake may also contribute to the reduction of wheat Cd accumulation after MPAL application. The current research can provide theoretical and technical support for the large-scale application of MPAL in Cd-contaminated wheat fields. [Display omitted] • MPAL demonstrated great immobilization efficiency on Cd-contaminated alkaline soil under field conditions. • Wheat grain Cd with MPAL treatment met the national standard. • MPAL significantly increased soil-available Mn and Mn concentration in wheat plants • MPAL enhanced the sorption of soil Cd onto Fe oxides. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01476513
- Volume :
- 266
- Database :
- Supplemental Index
- Journal :
- Ecotoxicology & Environmental Safety
- Publication Type :
- Academic Journal
- Accession number :
- 173319233
- Full Text :
- https://doi.org/10.1016/j.ecoenv.2023.115559