Effect of applying calcium peroxide on the accumulation of arsenic in rice plants grown in arsenic-elevated paddy soils.

Autor: Syu CH; Division of Agricultural Chemistry, Taiwan Agricultural Research Institute, Taichung City 41362, Taiwan., Yu CH; Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan., Lee DY; Department of Agricultural Chemistry, National Taiwan University, Taipei 10617, Taiwan. Electronic address: dylee@ntu.edu.tw.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2020 Nov; Vol. 266 (Pt 2), pp. 115140. Date of Electronic Publication: 2020 Jul 04.
DOI: 10.1016/j.envpol.2020.115140
Abstrakt: Water management such as drainage for creating aerobic conditions is considered to be an adequate method for reducing the accumulation of arsenic (As) in rice grains; however, it is difficult to conduct drainage operations in some areas that experience a lengthy rainy season as well as in soils with poor drainage. In this regard, application of oxygen-releasing compounds (ORCs) may be an alternative method for maintaining aerobic conditions even under flooding in paddy soils. Therefore, a pot experiment was conducted to investigate the effects of application of an ORC, calcium peroxide (CaO 2 ), on the growth and accumulation of As in rice plants grown in As-contaminated paddy soils. The rice plants were grown in two soils with different characteristics and As levels, and all of the tested soils were treated with 0, 5, 10, and 20 g CaO 2 kg -1 . Results revealed that the concentration of As and the distribution of arsenite in the pore water of all tested soils was reduced by CaO 2 application. In addition, the grain yields increased and the concentration of inorganic As in brown rice decreased by 25-45% upon CaO 2 treatment of low-As-level soils (<16 mg kg -1 ). However, the effect of CaO 2 application on the accumulation of inorganic As in brown rice in As-enriched soils (>78 mg kg -1 ) could not found in this study, due to the rice plant suffered from serious As phytotoxicity. It suggests that CaO 2 amendment may be suitable for reducing the As concentration of rice grains grown in low-As-level paddy soils, but for As-enriched soils, the proposed CaO 2 application method is not feasible.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: