Higher zero valent iron soil amendments dosages markedly inhibit accumulation of As in Faya and Kilombero cultivars compared to Cd

Angstone Thembachako Mlangeni; Shaun T. Lancaster; Andrea Raab; Eva M. Krupp; Gareth J. Norton; Joerg Feldmann

doi:10.1016/j.scitotenv.2021.148735

Higher zero valent iron soil amendments dosages markedly inhibit accumulation of As in Faya and Kilombero cultivars compared to Cd

Angstone Thembachako Mlangeni^*, Shaun T. Lancaster, Andrea Raab, Eva M. Krupp, Gareth J. Norton, Joerg Feldmann^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Impact of zero valent iron (Fe°) amendment on grain-yield (GY) and grain-As and Cd accumulation in rice (Oryza sativa L.) cultivars Kilombero and Faya were investigated. Rice plants were amended with Fe° dosages of 0, 3.1, 6.2, and 12.4 g Fe°/kg soil in pots in greenhouse experiments under continuous flooding water regime. GY in each treatment was determined at maturity, grain-As and Cd and arsenic species concentrations were determined using ICP-MS and HPLC tandem ICP-MS respectively. Mean GY in Faya (5.5 ± 1.0 g/plant) and Kilombero (4.2 ± 0.4 g/plant) amended with at least 6.2 g Fe°/kg soil were at least 57% and 22% respectively significantly higher (F = 11; p = 0.003) than that in controls (3.7 ± 0.6 and 3.4 ± 0.4 g/plant). For As bioaccumulation, mean grain-As concentration in Faya T2 (≤227 ± 32 μg/kg) and Kilombero (≤218 ± 25 μg/kg) amended with at least 6.2 g Fe°/kg soil in were at least 83% and 77% respectively significantly lower (F = 7; p = 0.004) than that in controls (973 ± 43 μg/kg and 1278 ± 208 μg/kg). Mean grain-Cd concentrations in Faya (10 ± 2 μg/kg) and Kilombero (13 ± 3 μg/kg) amended with corresponding Fe° dosages were at least 26% and 39% significantly lower (F = 4; p < 0.05) than that in controls (18 ± 3 and 23 ± 1 μg/kg). Results indicated that amending Kilombero with at least 6.2 g/kg Fe° effectively optimally regulated both grain-As and Cd accumulation to values lower than the European Commission's legislated maximum contaminant limits (MCL) of 200 μg/kg without negating grain yield benefits. Our results suggest that bioaccumulation of both As and Cd in rice grains may be completely circumvented by adopting cultivar-specific Fe° amendment dosage.

Original language	English
Article number	148735
Number of pages	12
Journal	Science of the Total Environment
Volume	794
Early online date	3 Jul 2021
DOIs	https://doi.org/10.1016/j.scitotenv.2021.148735
Publication status	Published - 10 Nov 2021

Bibliographical note

Funding Information:
The authors are thankful to the UK Government for providing the Scholarship to Angstone Thembachako Mlangeni (commonwealth scholar: MWCS-2015-334 ) through the Commonwealth Scholarship commission to carry out doctoral research at University of Aberdeen, Scotland. The authors are also grateful to the anonymous reviewers for both their kind comments and generous suggestions for upgrading this paper. ATM also thanks Dr. Magali Perez, Mr. Luke David Harrold and Mr. Michael William McGibbon for technical assistance with instrumentation.

Keywords

Arsenic
Cadmium
Cultivar
Faya
Kilombero
Zero valent iron (Fe°)

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10.1016/j.scitotenv.2021.148735

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@article{5902253fe671464a92c9b3317b10d68a,

title = "Higher zero valent iron soil amendments dosages markedly inhibit accumulation of As in Faya and Kilombero cultivars compared to Cd",

abstract = "Impact of zero valent iron (Fe°) amendment on grain-yield (GY) and grain-As and Cd accumulation in rice (Oryza sativa L.) cultivars Kilombero and Faya were investigated. Rice plants were amended with Fe° dosages of 0, 3.1, 6.2, and 12.4 g Fe°/kg soil in pots in greenhouse experiments under continuous flooding water regime. GY in each treatment was determined at maturity, grain-As and Cd and arsenic species concentrations were determined using ICP-MS and HPLC tandem ICP-MS respectively. Mean GY in Faya (5.5 ± 1.0 g/plant) and Kilombero (4.2 ± 0.4 g/plant) amended with at least 6.2 g Fe°/kg soil were at least 57% and 22% respectively significantly higher (F = 11; p = 0.003) than that in controls (3.7 ± 0.6 and 3.4 ± 0.4 g/plant). For As bioaccumulation, mean grain-As concentration in Faya T2 (≤227 ± 32 μg/kg) and Kilombero (≤218 ± 25 μg/kg) amended with at least 6.2 g Fe°/kg soil in were at least 83% and 77% respectively significantly lower (F = 7; p = 0.004) than that in controls (973 ± 43 μg/kg and 1278 ± 208 μg/kg). Mean grain-Cd concentrations in Faya (10 ± 2 μg/kg) and Kilombero (13 ± 3 μg/kg) amended with corresponding Fe° dosages were at least 26% and 39% significantly lower (F = 4; p < 0.05) than that in controls (18 ± 3 and 23 ± 1 μg/kg). Results indicated that amending Kilombero with at least 6.2 g/kg Fe° effectively optimally regulated both grain-As and Cd accumulation to values lower than the European Commission's legislated maximum contaminant limits (MCL) of 200 μg/kg without negating grain yield benefits. Our results suggest that bioaccumulation of both As and Cd in rice grains may be completely circumvented by adopting cultivar-specific Fe° amendment dosage.",

keywords = "Arsenic, Cadmium, Cultivar, Faya, Kilombero, Zero valent iron (Fe°)",

author = "Mlangeni, {Angstone Thembachako} and Lancaster, {Shaun T.} and Andrea Raab and Krupp, {Eva M.} and Norton, {Gareth J.} and Joerg Feldmann",

note = "Funding Information: The authors are thankful to the UK Government for providing the Scholarship to Angstone Thembachako Mlangeni (commonwealth scholar: MWCS-2015-334 ) through the Commonwealth Scholarship commission to carry out doctoral research at University of Aberdeen, Scotland. The authors are also grateful to the anonymous reviewers for both their kind comments and generous suggestions for upgrading this paper. ATM also thanks Dr. Magali Perez, Mr. Luke David Harrold and Mr. Michael William McGibbon for technical assistance with instrumentation. ",

year = "2021",

month = nov,

day = "10",

doi = "10.1016/j.scitotenv.2021.148735",

language = "English",

volume = "794",

journal = "Science of the Total Environment",

issn = "0048-9697",

publisher = "Elsevier",

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TY - JOUR

T1 - Higher zero valent iron soil amendments dosages markedly inhibit accumulation of As in Faya and Kilombero cultivars compared to Cd

AU - Mlangeni, Angstone Thembachako

AU - Lancaster, Shaun T.

AU - Raab, Andrea

AU - Krupp, Eva M.

AU - Norton, Gareth J.

AU - Feldmann, Joerg

N1 - Funding Information: The authors are thankful to the UK Government for providing the Scholarship to Angstone Thembachako Mlangeni (commonwealth scholar: MWCS-2015-334 ) through the Commonwealth Scholarship commission to carry out doctoral research at University of Aberdeen, Scotland. The authors are also grateful to the anonymous reviewers for both their kind comments and generous suggestions for upgrading this paper. ATM also thanks Dr. Magali Perez, Mr. Luke David Harrold and Mr. Michael William McGibbon for technical assistance with instrumentation.

PY - 2021/11/10

Y1 - 2021/11/10

N2 - Impact of zero valent iron (Fe°) amendment on grain-yield (GY) and grain-As and Cd accumulation in rice (Oryza sativa L.) cultivars Kilombero and Faya were investigated. Rice plants were amended with Fe° dosages of 0, 3.1, 6.2, and 12.4 g Fe°/kg soil in pots in greenhouse experiments under continuous flooding water regime. GY in each treatment was determined at maturity, grain-As and Cd and arsenic species concentrations were determined using ICP-MS and HPLC tandem ICP-MS respectively. Mean GY in Faya (5.5 ± 1.0 g/plant) and Kilombero (4.2 ± 0.4 g/plant) amended with at least 6.2 g Fe°/kg soil were at least 57% and 22% respectively significantly higher (F = 11; p = 0.003) than that in controls (3.7 ± 0.6 and 3.4 ± 0.4 g/plant). For As bioaccumulation, mean grain-As concentration in Faya T2 (≤227 ± 32 μg/kg) and Kilombero (≤218 ± 25 μg/kg) amended with at least 6.2 g Fe°/kg soil in were at least 83% and 77% respectively significantly lower (F = 7; p = 0.004) than that in controls (973 ± 43 μg/kg and 1278 ± 208 μg/kg). Mean grain-Cd concentrations in Faya (10 ± 2 μg/kg) and Kilombero (13 ± 3 μg/kg) amended with corresponding Fe° dosages were at least 26% and 39% significantly lower (F = 4; p < 0.05) than that in controls (18 ± 3 and 23 ± 1 μg/kg). Results indicated that amending Kilombero with at least 6.2 g/kg Fe° effectively optimally regulated both grain-As and Cd accumulation to values lower than the European Commission's legislated maximum contaminant limits (MCL) of 200 μg/kg without negating grain yield benefits. Our results suggest that bioaccumulation of both As and Cd in rice grains may be completely circumvented by adopting cultivar-specific Fe° amendment dosage.

AB - Impact of zero valent iron (Fe°) amendment on grain-yield (GY) and grain-As and Cd accumulation in rice (Oryza sativa L.) cultivars Kilombero and Faya were investigated. Rice plants were amended with Fe° dosages of 0, 3.1, 6.2, and 12.4 g Fe°/kg soil in pots in greenhouse experiments under continuous flooding water regime. GY in each treatment was determined at maturity, grain-As and Cd and arsenic species concentrations were determined using ICP-MS and HPLC tandem ICP-MS respectively. Mean GY in Faya (5.5 ± 1.0 g/plant) and Kilombero (4.2 ± 0.4 g/plant) amended with at least 6.2 g Fe°/kg soil were at least 57% and 22% respectively significantly higher (F = 11; p = 0.003) than that in controls (3.7 ± 0.6 and 3.4 ± 0.4 g/plant). For As bioaccumulation, mean grain-As concentration in Faya T2 (≤227 ± 32 μg/kg) and Kilombero (≤218 ± 25 μg/kg) amended with at least 6.2 g Fe°/kg soil in were at least 83% and 77% respectively significantly lower (F = 7; p = 0.004) than that in controls (973 ± 43 μg/kg and 1278 ± 208 μg/kg). Mean grain-Cd concentrations in Faya (10 ± 2 μg/kg) and Kilombero (13 ± 3 μg/kg) amended with corresponding Fe° dosages were at least 26% and 39% significantly lower (F = 4; p < 0.05) than that in controls (18 ± 3 and 23 ± 1 μg/kg). Results indicated that amending Kilombero with at least 6.2 g/kg Fe° effectively optimally regulated both grain-As and Cd accumulation to values lower than the European Commission's legislated maximum contaminant limits (MCL) of 200 μg/kg without negating grain yield benefits. Our results suggest that bioaccumulation of both As and Cd in rice grains may be completely circumvented by adopting cultivar-specific Fe° amendment dosage.

KW - Arsenic

KW - Cadmium

KW - Cultivar

KW - Faya

KW - Kilombero

KW - Zero valent iron (Fe°)

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U2 - 10.1016/j.scitotenv.2021.148735

DO - 10.1016/j.scitotenv.2021.148735

M3 - Article

C2 - 34323768

AN - SCOPUS:85109046448

SN - 0048-9697

VL - 794

JO - Science of the Total Environment

JF - Science of the Total Environment

M1 - 148735

ER -

Higher zero valent iron soil amendments dosages markedly inhibit accumulation of As in Faya and Kilombero cultivars compared to Cd

Abstract

Bibliographical note

Keywords

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