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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Geographical variations in arsenic contents in rice plants from Latin America and the Iberian Peninsula in relation to soil conditions

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Author(s):
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Otero, X. L. [1] ; Atiaga, O. [2, 1] ; Estrella, R. [2] ; Tierra, W. [3] ; Ruales, J. [3] ; Zayas, L. [4] ; Souza, V. Jr Jr ; Ferreira, T. O. [4] ; Nobrega, G. N. [5] ; Oliveira, D. P. ; Queiroz, H. M. [4] ; Nunes, L. M.
Total Authors: 12
Affiliation:
[1] Univ Santiago de Compostela, CRETUS Inst, Fac Bioloxia, Dept Edafoloxia & Quim Agr, Campus Sur, Santiago De Compostela 15782 - Spain
[2] Univ Fuerzas Armadas ESPE, Dept Ciencias Tierra & Construcc, Av Gen Ruminahui S-N, POB 171-5-231B, Sangolqui - Ecuador
[3] Escuela Politec Nacl, Dept Ciencia Alimentos & Biotecnol, Quito - Ecuador
[4] Univ Sao Paulo, ESALQ, Dept Ciencia Solo, Piracicaba - Brazil
[5] Univ Fed Fluminense, Dept Geoqufm, Outeiro Sao Joao Batista S-N, Campus Valonguinho, Niteroi 2402014, RJ - Brazil
Total Affiliations: 5
Document type: Journal article
Source: ENVIRONMENTAL GEOCHEMISTRY AND HEALTH; v. 42, n. 10 APR 2020.
Web of Science Citations: 1
Abstract

Arsenic is a ubiquitous, toxic element that is efficiently accumulated by rice plants. This study assessed the spatial variability in the total As (tAs) contents and organic and inorganic forms in different types of rice, plant parts (husk, stem, leaves and phytoliths) and residues. Samples were collected in different countries in Latin America (Ecuador, Brazil and Peru) and the Iberian Peninsula (Spain and Portugal). The tAs content in commercial polished rice from the Latin American countries was similar (0.130-0.166 mg kg(-1)) and significantly lower than in the rice from the Iberian countries (0.191 +/- 0.066 mg kg(-1)), and together, the tAs concentration in brown rice (236 +/- 0.093 mg kg(-1)) was significantly higher than in polished and parboiled rice. The inorganic As (iAs) content in rice was similar in both geographical regions, and the aforementioned difference was attributed to dimethylarsinic acid (DMA). The relative abundance of organic species increased as the tAs content in rice grain increased. A meta-analysis of our and previously reported data confirmed the negative correlation between iAs/tAs and tAs. At low tAs concentrations, inorganic forms are dominant, while at higher values (tAs > 0.300 mg kg(-1)) the concentration of organic As increases substantially and DMA becomes the dominant form in rice grain. On the contrary, inorganic arsenic was always the dominant form, mainly as arsenate {[}As(V)], in leaves and stems. The presence in soils of high concentrations of amorphous Fe and Al oxides and hydroxides, which are capable of strongly adsorbing oxyanions (i.e. arsenate), was associated with low concentrations of As in rice plants. In addition, the presence of high concentrations of As(V) in stems and leaves, low concentration of As in phytoliths, and the As associated with organic matter in stems and husk, together suggest that rice plants take up more As(V) than As(III). (AU)

FAPESP's process: 18/04259-2 - Iron biogeochemistry and its control on dynamics of trace metals in the soils of Doce River estuary after the "Mariana disaster"
Grantee:Hermano Melo Queiroz
Support Opportunities: Scholarships in Brazil - Doctorate