Reducing the arsenic (As) concentration in rice grains is of great interest from a human health perspective. Iron (Fe) materials immobilize As in soils, thereby effectively reducing the As concentration in rice grains. We investigated the effect of by-product Fe materials obtained from the casting industry on the As mobility in two soils (soil A and soil B) by a long-term (approximately 100 days) flooded soil incubation experiment. The examined Fe materials were spent steel shot (SSS), fine spent casting sand (SCS) containing steel shot, and two kinds of residual Fe materials (RIMs) from steel shot production. Commercial Fe materials used to immobilize As (zero-valent Fe and ferrihydrite) were tested for comparison. The dissolved As in soil solution of controls for soil A and soil B reached approximately 100 and 800 μg L‒1, respectively. The effect on As immobilization of all the by-product Fe materials increased with time and was comparable to or greater than that of commercial ferrihydrite, except for SCS. The additions of SSS and RIMs decreased by more than 90% of the dissolved As in soil A and decreased by more than 50% in soil B after 100 days incubation. Overall, the effect of the by-product Fe materials on the solubility of silicon and phosphorus was much less than that of the commercial Fe materials. Considering the cost advantage over commercial Fe materials, the Fe materials obtained from the casting industry as by-products are promising amendments for the immobilization of As in paddy soils.
雑誌名
Soil Science and Plant Nutrition
雑誌名(英)
Soil Science and Plant Nutrition
巻
64
号
2
ページ
210 - 217
発行年
2018-01-18
出版者
Taylor & Francis
ISSN
0038-0768
DOI
10.1080/00380768.2017.1385371
情報源
SC10201811010029
NARO成果DBa
author manuscript /This journal has an embargo period of 12 months.
This is an [Accepted Manuscript] of an article published by Taylor & Francis in [Soil Science and Plant Nutrition] on [Jan, 2018], available at http://wwww.tandfonline.com/10.1080/00380768.2017.1385371
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Arsenic immobilization in anaerobic soils by the application of by-product iron materials obtained from the casting industry
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