Comparison of As accumulation and speciation in water spinach (Ipomoea aquatica Forssk.) grown in As-elevated soils under flooding versus upland conditions.

Autor: Liao YJ; Department of Agricultural Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Rd., Taipei 10617, Taiwan., Syu CH; Division of Agricultural Chemistry, Taiwan Agricultural Research Institute, No.189, Zhongzheng Rd., Wufeng Dist., Taichung City 41362, Taiwan., Lee DY; Department of Agricultural Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Rd., Taipei 10617, Taiwan. Electronic address: dylee@ntu.edu.tw.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2021 Aug 05; Vol. 415, pp. 125711. Date of Electronic Publication: 2021 Mar 23.
DOI: 10.1016/j.jhazmat.2021.125711
Abstrakt: Water spinach (Ipomoea aquatica Forssk.) is a popular semi-aquatic vegetable with high arsenic (As) accumulation capability in tropical and subtropical areas, and it can grow under both flooding and upland conditions. Because only few studies addressed the dietary As risk of vegetable consumption, this study investigated the accumulation and speciation of As in the water spinach, and the human health risk of consuming this crop grown in different water managements. Pot experiments were conducted in two soils with different As levels under both flooded and upland conditions. The results showed that As concentrations, mainly inorganic As, in soil pore water and shoots under flooded conditions increased 2.05- to 5.11-fold and 1.30- to 2.55-fold respectively as compared with upland conditions. Even though Fe plaque formation on the root surface was higher under flooded conditions than under upland conditions, it still cannot act as an effective barrier to sequester As released from flooded soils into plant tissue. The dietary risk of consuming inorganic As through water spinach planted in flooded soils was higher than in upland soils, especially in high-As-level soils. This suggests that in As-elevated soils, water spinach should be planted in upland conditions rather than in flooding conditions.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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