Arsenic removal from flooded paddy soil with spontaneous hygrophyte markedly attenuates rice grain arsenic. 2019

Xin Wang, and Rui Huang, and Liang Li, and Sixue He, and Lu Yan, and Hao Wang, and Xin Wu, and Yulong Yin, and Baoshan Xing
College of Resources and Environmental Science, Hunan Normal University, Changsha, Hunan 410081, China. Electronic address: wangxin@hunnu.edu.cn.

China ranks the top in global annual rice output. However, extensive mining and smelting has led to elevated arsenic (As) in paddy soils, potentially imperiling local population health and sustainable rice production in the country. Under flooded condition, reductive As mobilization generally occurs, providing a unique advantage for soil As removal. In this study, we explore the depletion magnitude of labile As from paddy soils through cycling of flooding-drainage with three distinct co-strategies, i.e. (1) no soil disturbance with spontaneously established hygrophyte plants, (2) selective fertilization to enhance soil As release, and (3) soil ploughing following each drainage. After 151 days of flooding with periodic drainage, diffusive gradients in thin film (DGT)-labile As through 0-14 cm soil profile with hygrophyte plants growing decreased from initial 292 μg l-1 to well below the required threshold level (57-77 μg l-1) for safe rice production. Correspondingly, an average of 22.9% of total soil As was removed, with up to 76.7% of As bound to amorphous Fe hydroxides being stripped in this treatment. In the following rice cultivation, inorganic As in the polished rice from the naturally vegetated treatment (0.15 mg kg-1) fell successfully below the Chinese food safety standard (0.2 mg kg-1). The results highlight that As removal from paddy soils with native hygrophyte under shallow flooded condition can decrease soil bioavailable As specifically to safe levels within a relatively short period, and thus provides a novel and quite cost-effective pathway securing rice production.

UI MeSH Term Description Entries
D002523 Edible Grain SEEDS used as a major nutritional source, most often the grain from the POACEAE family. Cereals,Cereal Grain,Cereal,Cereal Grains,Edible Grains,Grain, Cereal,Grain, Edible,Grains, Cereal,Grains, Edible
D002681 China A country spanning from central Asia to the Pacific Ocean. Inner Mongolia,Manchuria,People's Republic of China,Sinkiang,Mainland China
D001151 Arsenic A shiny gray element with atomic symbol As, atomic number 33, and atomic weight 75. It occurs throughout the universe, mostly in the form of metallic arsenides. Most forms are toxic. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985), arsenic and certain arsenic compounds have been listed as known carcinogens. (From Merck Index, 11th ed) Arsenic-75,Arsenic 75
D001152 Arsenicals Inorganic or organic compounds that contain arsenic. Arsenic Compounds,Compounds, Arsenic
D012275 Oryza A genus of grass family (Poaceae) that include several rice species. Oryza sativa,Rice,Rices
D012987 Soil The unconsolidated mineral or organic matter on the surface of the earth that serves as a natural medium for the growth of land plants. Peat,Humus,Soils
D012989 Soil Pollutants Substances which pollute the soil. Use for soil pollutants in general or for which there is no specific heading. Soil Pollutant,Pollutant, Soil,Pollutants, Soil
D055868 Floods Sudden onset water phenomena with different speed of occurrence. These include flash floods, seasonal river floods, and coastal floods, associated with CYCLONIC STORMS; TIDALWAVES; and storm surges. Flooding, Catastrophic,Catastrophic Flooding,Catastrophic Floodings,Floodings, Catastrophic

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