Mandal, J ORCID: https://orcid.org/0000-0003-0814-0369, Sengupta, S, Sarkar, S, Mukherjee, A, Wood, M
ORCID: https://orcid.org/0000-0002-0635-2387, Hutchinson, SM
ORCID: https://orcid.org/0000-0003-0072-1062 and Mondal, D
ORCID: https://orcid.org/0000-0002-5144-626X
2021,
'Meta-analysis enables prediction of the maximum permissible arsenic concentration in Asian paddy soil'
, Frontiers in Environmental Science, 9
, p. 760125.
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Abstract
It is now well-established that not just drinking water, but irrigation water contaminated with arsenic (As) is an important source of human As exposure through water-soil-rice transfer. While drinking water As has a permissible, or guideline value, quantification of guideline values for soil and irrigation water is limited. Using published data from twenty-six field studies (not pot-based experiments) from Asia, each of which reported irrigation water, soil and rice grain arsenic concentrations from the same site, this meta-analysis quantitatively evaluated the relationship between soil and irrigation water As concentrations and the As concentration in the rice grain. A generalized linear regression model revealed As in soil to be a stronger predictor of As in rice than As in irrigation water (beta of 16.72 and 0.6 respectively, 24 p<0.01). Based on the better performing decision tree model, using soil and irrigation water As as independent variables we determined that Asian paddy soil As concentrations greater than 14 mg kg-1 may result in rice grains exceeding the Codex recommended maximum allowable inorganic As (i-As) concentrations of 0.2 mg kg-1 for polished rice and 0.35 mg kg-1 for husked rice. Both logistic regression and decision tree models, identified soil As as the main determining factor and irrigation water to be a non-significant factor, preventing determination of any guideline value for irrigation water. The seemingly non-significant contribution of irrigation water in predicting grain i-As concentrations below or above the Codex recommendation may be due to the complexity in the relationship between irrigation water As and rice grains. Despite modeling limitations and heterogeneity in meta-data, our findings can inform the maximum permissible As concentrations in Asian paddy soil.
Item Type: | Article |
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Contributors: | Lejano, RP (Editor), Verma, PK (Reviewer) and Singh, S (Reviewer) |
Schools: | Schools > School of Environment and Life Sciences > Ecosystems and Environment Research Centre |
Journal or Publication Title: | Frontiers in Environmental Science |
Publisher: | Frontiers |
ISSN: | 2296-665X |
Related URLs: | |
Depositing User: | USIR Admin |
Date Deposited: | 18 Nov 2021 11:00 |
Last Modified: | 15 Feb 2022 16:56 |
URI: | http://usir.salford.ac.uk/id/eprint/62373 |
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