Dissolved ferrous iron concentration optimal for simultaneous reduction of arsenic and cadmium concentrations in rice grain

T. Honma, T. Tsuchida, H. Ohba, T. Makino, K. Nakamura, H. Katou

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Arsenic (As) and cadmium (Cd) in rice grain pose threats to human health. Their concentrations in rice grain are sensitive to water managements such as flooding and drainage, and resultant changes in the soil redox potential. However, there has been a paucity of reports on the soil redox conditions under which uptake of As and Cd by rice and their concentrations in grain may be simultaneously suppressed. We carried out field experiments to find the optimal water management and soil conditions, in terms of dissolved ferrous iron (Fe(II)) concentration, for simultaneous reduction of As and Cd in the soil solution and rice grain. Dissolved As and Cd concentrations during pre-heading 3 weeks and post-heading 3 weeks, which exerted strong influence on the As and Cd concentrations in grain, showed distinct relationships with the dissolved Fe(II) concentration. In a given paddy field, the dissolved Fe(II) serves as an indicator of the soil redox condition, and the concentration within the range of 20–30 mg/L was found to be optimum for simultaneous reduction of dissolved As and Cd concentrations in the paddy field tested.

Original languageEnglish
Title of host publicationArsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016
EditorsProsun Bhattacharya, Gunnar Jacks, Jochen Bundschuh, Prosun Bhattacharya, Marie Vahter, Jerker Jarsjo, Jerker Jarsjo, Jurate Kumpiene, Arslan Ahmad, Charlotte Sparrenbom, Marinus Eric Donselaar, Jochen Bundschuh, Ravi Naidu, Ravi Naidu
PublisherCRC Press/Balkema
Pages287-288
Number of pages2
ISBN (Print)9781138029415
DOIs
Publication statusPublished - 2016 Jan 1
Externally publishedYes
Event6th International Congress on Arsenic in the Environment, AS 2016 - Stockholm, Sweden
Duration: 2016 Jun 192016 Jun 23

Publication series

NameArsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016

Other

Other6th International Congress on Arsenic in the Environment, AS 2016
CountrySweden
CityStockholm
Period16/6/1916/6/23

ASJC Scopus subject areas

  • Pollution
  • Environmental Chemistry

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