Influence of phosphorus levels and pH on arsenate adsorption on Gray Lowland soil
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- Sato Kenji
- Graduate School of Agriculture, Kyoto University
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- Hama Takehide
- Graduate School of Agriculture, Kyoto University
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- Tanaka Rina
- Graduate School of Agriculture, Kyoto University
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- Wakita Risa
- Graduate School of Agriculture, Kyoto University
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- Nakamura Kimihito
- Graduate School of Agriculture, Kyoto University
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- Ito Hiroaki
- Center for Water Cycle, Marine Environment and Disaster Management, Kumamoto University
Bibliographic Information
- Other Title
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- 灰色低地土におけるヒ酸の吸着に与えるリン競合とpHの影響
Description
<p>There are limited studies that investigate the competitive adsorption between arsenate and phosphate and the impact of pH on arsenate adsorption on Gray Lowland soil, a common paddy soil in Japan. Furthermore, the effect of the native soil phosphorus on arsenate adsorption warrants evaluation. This study aims to 1) assess the characteristics of arsenate adsorption on Gray Lowland soil by comparing it with that on Andosols, which was reported in a previous study and 2) assess the dissolution of native soil phosphorus and its impact on arsenate adsorption. The findings revealed that the amount of arsenate adsorption on Gray Lowland soil was approximately 10% of that on Andosols. The maximum arsenate adsorption on Andosols and Gray Lowland soil was observed at an equilibrium pH of ~3.8 and ~3.0, respectively. Moreover, competitive adsorption between arsenate and phosphate was observed on Gray Lowland soil. The fraction of weakly adsorbed arsenate accounted for 32% of the total adsorbed arsenate, despite adding only arsenate to the soil. It is suggested that arsenate competed with phosphorus, which was released from phosphorous bound to calcium and/or unstable iron contained in soil, in the adsorption on Gray Lowland soil. Native soil phosphorus in Gray Lowland soil continued to be released following repeated input of distilled water. These findings demonstrate that arsenate is not retained for extended periods by the topsoil, which has a low adsorption capacity of arsenate and whose adsorption sites are already saturated with phosphorous. This is because the added arsenate is either weakly or hardly adsorbed to the soil.</p>
Journal
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- Japanese Journal of Soil Science and Plant Nutrition
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Japanese Journal of Soil Science and Plant Nutrition 95 (1), 30-37, 2024-02-05
Japanese Society of Soil Science and Plant Nutrition
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Keywords
Details 詳細情報について
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- CRID
- 1390580793825465088
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- ISSN
- 24240583
- 00290610
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- Text Lang
- ja
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- Data Source
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- JaLC
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- Abstract License Flag
- Disallowed