Simultaneous stimulation of arsenic methylation and inhibition of cadmium bioaccumulation in rice grain using zero valent iron and alternate wetting and drying water management

Angstone Thembachako Mlangeni, Magali Perez, Andrea Raab, Eva M. Krupp, Gareth J. Norton, Joerg Feldmann*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Studies aiming to limit bioaccumulation of arsenic (As) and cadmium (Cd) in rice grain has attracted global attention. In this study, simultaneous impact of zero valent iron (Fe⁰) and various water management regimes (continuous flooding (CF), alternate wetting and drying (AWD) and low water (LW)) on rice grain yield (GYM) and bioaccumulation of As and Cd in unpolished rice grain (URG) were investigated. Compared to respective control treatments, Fe⁰ significantly reduced GYM under LW by 32% (p <0.001) and significantly increased GYM under AWD by 24% (p = 0.009; F = 5.9) but had no significant effect on GYM under CF water management regime (p > 0.05). The grain harvest index was significantly higher in Fe⁰ amended rice under AWD (67%; p <0.001) and CF (35%; p = 0.001) compared to those without Fe⁰ amendment. Fe⁰ significantly reduced tAs in URG under LW by 32% (p <0.017) and significantly increased tAs in URG under AWD by 37% (p = 0.007) but had no significant effect on tAs in URG under CF (p > 0.05). The Cd concentrations were significantly reduced by 51% (p = 0.002) and 61% (p <0.003) in URG under LW and AWD respectively compared to the respective control treatments. The Dimethylarsinic acid (DMA) in unpolished rice (URG) under AWD(+Fe⁰) was significantly higher (p <0.01; F = 11.3) compared to that accumulated in URG under AWD(-Fe°). Despite increasing As accumulation in AWD water management, simultaneous use of AWD water management and Fe° increased grain yield, enhanced accumulation of less toxic methylated As in rice grains and accumulated low Cd concentrations comparable to that attainable with CF water management indicating that simultaneous use AWD and Fe° can be effective in controlling Cd accumulation in paddies highly contaminated with Cd.
Original languageEnglish
JournalScience of the Total Environment
Early online date23 Nov 2019
DOIs
Publication statusE-pub ahead of print - 23 Nov 2019

Fingerprint

Bioaccumulation
Methylation
Water management
methylation
Arsenic
Cadmium
wetting
bioaccumulation
Wetting
water management
arsenic
Drying
cadmium
rice
Iron
iron
Water
flooding
Cacodylic Acid
drying

Keywords

  • Arsenic
  • Cadmium
  • Rice cultivars
  • Zero valent iron (Fe°)
  • Faya cv
  • Continuous flooding
  • Alternate wetting and drying
  • Low water

Cite this

@article{f636629674d44c92b4d70bcaf2b7e786,
title = "Simultaneous stimulation of arsenic methylation and inhibition of cadmium bioaccumulation in rice grain using zero valent iron and alternate wetting and drying water management",
abstract = "Studies aiming to limit bioaccumulation of arsenic (As) and cadmium (Cd) in rice grain has attracted global attention. In this study, simultaneous impact of zero valent iron (Fe⁰) and various water management regimes (continuous flooding (CF), alternate wetting and drying (AWD) and low water (LW)) on rice grain yield (GYM) and bioaccumulation of As and Cd in unpolished rice grain (URG) were investigated. Compared to respective control treatments, Fe⁰ significantly reduced GYM under LW by 32{\%} (p <0.001) and significantly increased GYM under AWD by 24{\%} (p = 0.009; F = 5.9) but had no significant effect on GYM under CF water management regime (p > 0.05). The grain harvest index was significantly higher in Fe⁰ amended rice under AWD (67{\%}; p <0.001) and CF (35{\%}; p = 0.001) compared to those without Fe⁰ amendment. Fe⁰ significantly reduced tAs in URG under LW by 32{\%} (p <0.017) and significantly increased tAs in URG under AWD by 37{\%} (p = 0.007) but had no significant effect on tAs in URG under CF (p > 0.05). The Cd concentrations were significantly reduced by 51{\%} (p = 0.002) and 61{\%} (p <0.003) in URG under LW and AWD respectively compared to the respective control treatments. The Dimethylarsinic acid (DMA) in unpolished rice (URG) under AWD(+Fe⁰) was significantly higher (p <0.01; F = 11.3) compared to that accumulated in URG under AWD(-Fe°). Despite increasing As accumulation in AWD water management, simultaneous use of AWD water management and Fe° increased grain yield, enhanced accumulation of less toxic methylated As in rice grains and accumulated low Cd concentrations comparable to that attainable with CF water management indicating that simultaneous use AWD and Fe° can be effective in controlling Cd accumulation in paddies highly contaminated with Cd.",
keywords = "Arsenic, Cadmium, Rice cultivars, Zero valent iron (Fe°), Faya cv, Continuous flooding, Alternate wetting and drying, Low water",
author = "{Thembachako Mlangeni}, Angstone and Magali Perez and Andrea Raab and Krupp, {Eva M.} and Norton, {Gareth J.} and Joerg Feldmann",
note = "Acknowledgements Authors are grateful to The UK government for supporting this work through the Commonwealth Scholarship awarded to Angstone Thembachako Mlangeni, commonwealth scholar (MWCS-2015-334). ATM further acknowledges technical support from Luke David Harrold, Michael William Mcgibbon and David Robert Galloway. ATM also acknowledges continued family financial support from Lilongwe University of Agriculture and Natural Resources (through the Natural Resources College, Malawi) duration the entire study period in UK.",
year = "2019",
month = "11",
day = "23",
doi = "10.1016/j.scitotenv.2019.134696",
language = "English",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

TY - JOUR

T1 - Simultaneous stimulation of arsenic methylation and inhibition of cadmium bioaccumulation in rice grain using zero valent iron and alternate wetting and drying water management

AU - Thembachako Mlangeni, Angstone

AU - Perez, Magali

AU - Raab, Andrea

AU - Krupp, Eva M.

AU - Norton, Gareth J.

AU - Feldmann, Joerg

N1 - Acknowledgements Authors are grateful to The UK government for supporting this work through the Commonwealth Scholarship awarded to Angstone Thembachako Mlangeni, commonwealth scholar (MWCS-2015-334). ATM further acknowledges technical support from Luke David Harrold, Michael William Mcgibbon and David Robert Galloway. ATM also acknowledges continued family financial support from Lilongwe University of Agriculture and Natural Resources (through the Natural Resources College, Malawi) duration the entire study period in UK.

PY - 2019/11/23

Y1 - 2019/11/23

N2 - Studies aiming to limit bioaccumulation of arsenic (As) and cadmium (Cd) in rice grain has attracted global attention. In this study, simultaneous impact of zero valent iron (Fe⁰) and various water management regimes (continuous flooding (CF), alternate wetting and drying (AWD) and low water (LW)) on rice grain yield (GYM) and bioaccumulation of As and Cd in unpolished rice grain (URG) were investigated. Compared to respective control treatments, Fe⁰ significantly reduced GYM under LW by 32% (p <0.001) and significantly increased GYM under AWD by 24% (p = 0.009; F = 5.9) but had no significant effect on GYM under CF water management regime (p > 0.05). The grain harvest index was significantly higher in Fe⁰ amended rice under AWD (67%; p <0.001) and CF (35%; p = 0.001) compared to those without Fe⁰ amendment. Fe⁰ significantly reduced tAs in URG under LW by 32% (p <0.017) and significantly increased tAs in URG under AWD by 37% (p = 0.007) but had no significant effect on tAs in URG under CF (p > 0.05). The Cd concentrations were significantly reduced by 51% (p = 0.002) and 61% (p <0.003) in URG under LW and AWD respectively compared to the respective control treatments. The Dimethylarsinic acid (DMA) in unpolished rice (URG) under AWD(+Fe⁰) was significantly higher (p <0.01; F = 11.3) compared to that accumulated in URG under AWD(-Fe°). Despite increasing As accumulation in AWD water management, simultaneous use of AWD water management and Fe° increased grain yield, enhanced accumulation of less toxic methylated As in rice grains and accumulated low Cd concentrations comparable to that attainable with CF water management indicating that simultaneous use AWD and Fe° can be effective in controlling Cd accumulation in paddies highly contaminated with Cd.

AB - Studies aiming to limit bioaccumulation of arsenic (As) and cadmium (Cd) in rice grain has attracted global attention. In this study, simultaneous impact of zero valent iron (Fe⁰) and various water management regimes (continuous flooding (CF), alternate wetting and drying (AWD) and low water (LW)) on rice grain yield (GYM) and bioaccumulation of As and Cd in unpolished rice grain (URG) were investigated. Compared to respective control treatments, Fe⁰ significantly reduced GYM under LW by 32% (p <0.001) and significantly increased GYM under AWD by 24% (p = 0.009; F = 5.9) but had no significant effect on GYM under CF water management regime (p > 0.05). The grain harvest index was significantly higher in Fe⁰ amended rice under AWD (67%; p <0.001) and CF (35%; p = 0.001) compared to those without Fe⁰ amendment. Fe⁰ significantly reduced tAs in URG under LW by 32% (p <0.017) and significantly increased tAs in URG under AWD by 37% (p = 0.007) but had no significant effect on tAs in URG under CF (p > 0.05). The Cd concentrations were significantly reduced by 51% (p = 0.002) and 61% (p <0.003) in URG under LW and AWD respectively compared to the respective control treatments. The Dimethylarsinic acid (DMA) in unpolished rice (URG) under AWD(+Fe⁰) was significantly higher (p <0.01; F = 11.3) compared to that accumulated in URG under AWD(-Fe°). Despite increasing As accumulation in AWD water management, simultaneous use of AWD water management and Fe° increased grain yield, enhanced accumulation of less toxic methylated As in rice grains and accumulated low Cd concentrations comparable to that attainable with CF water management indicating that simultaneous use AWD and Fe° can be effective in controlling Cd accumulation in paddies highly contaminated with Cd.

KW - Arsenic

KW - Cadmium

KW - Rice cultivars

KW - Zero valent iron (Fe°)

KW - Faya cv

KW - Continuous flooding

KW - Alternate wetting and drying

KW - Low water

U2 - 10.1016/j.scitotenv.2019.134696

DO - 10.1016/j.scitotenv.2019.134696

M3 - Article

C2 - 31852588

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -