Strontium adsorption and penetration in kaolinite at low Sr2+concentration
Abstract
This is an Accepted Manuscript of an article published by Taylor & Francis in Soil Science and Plant Nutrition on 02 Feb 2017, available online: http://www.tandfonline.com/10.1080/00380768.2016.1277435.
ABSTRACT: Behavior of radioactive strontium (Sr2+) in contaminated soils is an important issue in relation to nuclear power plant accidents. The Sr2+adsorption on kaolinite and its migration in a kaolinite soil were investigated because toxic effects of radioactive Sr2+have been found to be very severe for living organisms at low Sr2+concentrations. Adsorption isotherms of Sr2+on kaolinite at different salt (NaCl) concentration and pH were obtained by the batch method. The calculated distribution coefficients (KD) ranged between 600 and 40,000 L kg−1, which showed a strong preference for the adsorbed phase. The results were used to evaluate the ratio (r) of penetration length of Sr2+relative to that of water in a model kaolinite soil. When the Sr2+solution was percolated constantly into the kaolinite soil, the penetration ofSr2+was delayed strongly at low Sr2+concentration due to adsorption. The Sr2+penetration length was only 0.001–0.056 of the water penetration length at pH 6.5 (0.1–10 mmol L−1NaCl). At pH 4.1 (1 mmol L−1NaCl) the effect was about 17 times less than at pH 6.5 (1 mmol L−1NaCl). Under all conditions, the Sr2+penetration increased when the Sr2+concentration increased due to the KD decrease. The Sr2+isothermscould be fitted well to the Langmuir adsorption equation, which indicates that only one site type is involved in the Sr2+adsorption.
Journal
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- Soil Science and Plant Nutrition
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Soil Science and Plant Nutrition 63 (1), 14-17, 2017-02-02
Taylor & Francis Asia Pacific (Singapore)
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Details 詳細情報について
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- CRID
- 1050282813999537408
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- NII Article ID
- 120006401443
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- ISSN
- 17470765
- 00380768
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- HANDLE
- 2115/68411
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles