Organo-arsenic complexation studies explaining the reduction of uptake of arsenic in wheat grown with contaminated irrigation water and organic amendments

Kumar, SN; Mishra, BB; Kumar, S; Mandal, J

Abstract

Application of organics in soil can reduce uptake of arsenic (As) in food crops grown on soil spiked with As. However, the results may be different if the crop is grown with As-contaminated irrigation water. In this study, a modest initiative has been under- taken to assess the organo-arsenic equilibria using the fulvic and humic extracted from paddy husk (PH), vermicompost (VC), and soil. The fulvic and humic acids were found to be polyprotic in nature. Fulvic acid extracted from paddy husk have the highest mole ratio or combining ability of 1.88 ± 0.59 and stability con- stant (log K) of 8.96 ± 0.21. Based on the above find- ings, a greenhouse experiment with wheat crop was conducted using different concentrations of As in irri- gation water (1, 2, 4, and 8 mg L−1), irrigated 5 times throughout the crop growth period and 3 levels of amendments (No amendment, VC and PH @ 10 t ha−1 each). Paddy husk and also vermicompost can be effec- tively used as an amendment to trim down the bioavail- ability of arsenic in the wheat grain provided the As content in irrigation water is < 2 mg L−1. Risk assess- ment of As spiked soils was carried out and expressed in hazard quotient as per USEPA guideline. Solubility freeion activity model was also used to forecast the transfer of As from As spiked soil to wheat grain.

Citation

Kumar, S., Mishra, B., Kumar, S., & Mandal, J. (2021). Organo-arsenic complexation studies explaining the reduction of uptake of arsenic in wheat grown with contaminated irrigation water and organic amendments. Water, Air, and Soil Pollution, 232(3), 118. https://doi.org/10.1007/s11270-021-05065-8

• Journal Article Type: Article
• Acceptance Date: Feb 24, 2021
• Publication Date: Mar 9, 2021
• Deposit Date: May 10, 2021
• Publicly Available Date: Mar 9, 2022
• Journal: Water, Air, & Soil Pollution
• Print ISSN: 0049-6979
• Electronic ISSN: 1573-2932
• Publisher: Springer Verlag
• Volume: 232
• Issue: 3
• Pages: 118
• DOI: https://doi.org/10.1007/s11270-021-05065-8
• Publisher URL: https://doi.org/10.1007/s11270-021-05065-8
• Related Public URLs: https://www.springer.com/journal/11270
• Additional Information: Access Information : This is a post-peer-review, pre-copyedit version of an article published in Water, Air, & Soil Pollution. The final authenticated version is available online at: http://dx.doi.org/10.1007/s11270-021-05065-8