Journal ArticleDOI
Optimal Soil Eh, pH, and Water Management for Simultaneously Minimizing Arsenic and Cadmium Concentrations in Rice Grains
Toshimitsu Honma,Hirotomo Ohba,Ayako Kaneko-Kadokura,Tomoyuki Makino,Ken Nakamura,Hidetaka Katou +5 more
TLDR
For minimizing the trade-off relationship between As and Cd in rice grains in the field investigated, water management strategies should target the realization of optimal soil Eh of -73 mV and pH of 6.2 during the 3 weeks after heading.Abstract:
Arsenic (As) and cadmium (Cd) concentrations in rice grains are a human health concern. We conducted field experiments to investigate optimal conditions of Eh and pH in soil for simultaneously decreasing As and Cd accumulation in rice. Water managements in the experiments, which included continuous flooding and intermittent irrigation with different intervals after midseason drainage, exerted striking effects on the dissolved As and Cd concentrations in soil through changes in Eh, pH, and dissolved Fe(II) concentrations in the soil. Intermittent irrigation with three-day flooding and five-day drainage was found to be effective for simultaneously decreasing the accumulation of As and Cd in grain. The grain As and Cd concentrations were, respectively, linearly related to the average dissolved As and Cd concentrations during the 3 weeks after heading. We propose a new indicator for expressing the degree to which a decrease in the dissolved As or Cd concentration is compromised by the increase in the other. F...read more
Citations
More filters
Journal ArticleDOI
Cadmium contamination in agricultural soils of China and the impact on food safety.
TL;DR: A number of countermeasures to address soil Cd contamination are proposed, including i) mitigation of Cd transfer from paddy soils to rice grain, and ii) intervention in those farmers who consume home-grown Cd-contaminated rice.
Journal ArticleDOI
Cadmium in rice: Transport mechanisms, influencing factors, and minimizing measures.
TL;DR: Efficient measures to immobilize Cd in soil and reduce Cd uptake by rice are discussed (including agronomic practices, bioremediation and molecular biology techniques) to contribute to ensuring food safety, and reducing Cd risk on human beings.
Journal ArticleDOI
Remediation of Heavy Metal-Polluted Agricultural Soils Using Clay Minerals: A Review
TL;DR: In this paper, the application of clay minerals for the remediation of heavy metal-polluted agricultural soils is summarized, in terms of their remediation effects and mechanisms, influencing factors, and future focus.
Journal ArticleDOI
Dietary cadmium intake from rice and vegetables and potential health risk: A case study in Xiangtan, southern China.
TL;DR: There is an urgent need to reduce the transfer of Cd from soil to the food chain in the investigated region, with children (4-11 years) exhibiting the highest intake.
Journal ArticleDOI
Metal(loid)s (As, Hg, Se, Pb and Cd) in paddy soil: Bioavailability and potential risk to human health.
Rubina Khanam,Anjani Kumar,Amaresh Kumar Nayak,Shahid,Rahul Tripathi,Subramaniyan Vijayakumar,Debarati Bhaduri,Upendra Kumar,Sangita Mohanty,Periyasamy Panneerselvam,Dibyendu Chatterjee,B.S. Satapathy,H Pathak +12 more
TL;DR: This review summarizes mobilization, translocation and speciation mechanism of these metal(loids) in soil-plant continuum as well as available cost-effective remediation measures and future research needs to eliminate the long-term risk to human health.
References
More filters
Journal ArticleDOI
Transporters of arsenite in rice and their role in arsenic accumulation in rice grain
Jian Feng Ma,Naoki Yamaji,Namiki Mitani,Xiao-Yan Xu,Yu-Hong Su,Steve P. McGrath,Fang-Jie Zhao +6 more
TL;DR: It is reported that two different types of transporters mediate transport of arsenite, the predominant form of arsenic in paddy soil, from the external medium to the xylem, which explains why rice is efficient in arsenic accumulation.
Journal ArticleDOI
Greatly enhanced arsenic shoot assimilation in rice leads to elevated grain levels compared to wheat and barley
Paul N. Williams,Antia Villada,Claire Deacon,Andrea Raab,Jordi Figuerola,Andy J. Green,Joerg Feldmann,Andrew A. Meharg +7 more
TL;DR: Investigation of variation in the assimilation and translocation of arsenic in commercially farmed temperate rice, wheat, and barley found that the risk posed by As in the human food-chain needs to be considered in the context of anaerobic verses aerobic ecosystems.
Book ChapterDOI
Reactions controlling heavy metal solubility in soils
TL;DR: In this paper, a more fundamental understanding of the soil processes controlling metal solubility is proposed to prevent practices that could have deleterious effects on soil productivity and environmental quality.
Journal ArticleDOI
Growing Rice Aerobically Markedly Decreases Arsenic Accumulation
TL;DR: It is demonstrated that a greatly increased bioavailability of As under the flooded conditions is the main reason for an enhanced As accumulation by flooded rice, and growing rice aerobically can dramatically decrease the As transfer from soil to grain.
Journal ArticleDOI
Arsenic Behavior in Paddy Fields during the Cycle of Flooded and Non-flooded Periods
Yoshio Takahashi,Reiko Minamikawa,Keiko Hattori,Katsuaki Kurishima,Nobuharu Kihou,Kouichi Yuita +5 more
TL;DR: This work, primarily based on data from an actual paddy field, suggests that rice plants are enriched in As because the rice grows in flooded paddy fields when mobile As(III) is released to soil water.