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Effect of cooking on arsenic concentration in rice

Abstract

This study assessed the effect of rinsing and boiling on total content of As (tAs) and of its inorganic and organic forms in different types of rice (polished and brown) from Spain and Ecuador. Rice was subjected to five different treatments. The results showed that the treatment consisting of three grain rinsing cycles followed by boiling in excess water showed a significant decrease in tAs content compared with raw rice. Regarding As species, it is worth noting that the different treatments significantly reduced the content of the most toxic forms of As. The estimated lifetime health risks indicate that pre-rinsing alone can reduce the risk by 50%, while combining it with discarding excess water can reduce the risk by 83%; therefore, the latter would be the preferable method.

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Acknowledgments

We would like to thank María José Santiso for her assistance with laboratory work.

Funding

This study is part of a research project funded by the Universidad de las Fuerzas Armadas-ESPE through Project 2015-PIC-017, Xunta de Galicia-Consellería de Educación, Universidades e Formación Profesional, Plan Galego IDT, Consolidation of competitive research groups (ref. ED31C2018/12), and Cross-Research in Environmental Technologies (CRETUS, AGRUP2015/02, ref. 2018-PG100). XLOP is grateful for the financial support from the Proyecto PROMETEO (SENESCYT Ecuador).

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Correspondence to Luis M. Nunes.

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Hypothesis

Rice can reach high arsenic concentrations, and the cooking process can substantially reduce its concentration

Responsible editor: Philippe Garrigues

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Atiaga, O., Nunes, L.M. & Otero, X.L. Effect of cooking on arsenic concentration in rice. Environ Sci Pollut Res 27, 10757–10765 (2020). https://doi.org/10.1007/s11356-019-07552-2

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Keywords

  • Arsenic
  • Rice
  • Ecuador
  • Spain
  • Cooking
  • Arsenic species