Chemical forms and stability of selenium in soil

Yamada, Hidekazu; Kang, Youngnam; Aso, Tomonori; Uesugi, Hiroshi; Fujimura, Tomokazu; Yonebayashi, Koyo

doi:10.1080/00380768.1998.10414460

Cited by 25 publications

(13 citation statements)

References 10 publications

(19 reference statements)

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“…Our finding that most (67-86%) of soluble Se is colloidal Se is in line with the conclusion of Yamada et al (11) who found that 30-77% of soil soluble Se is organic Se. However, in another study, Zhang et al (12) found that only less than 10% of Se in agriculture drainage water is organic Se and the dominant species is inorganic selenate.…”

Section: Resultssupporting

confidence: 95%

Speciation of Se and DOC in Soil Solution and Their Relation to Se Bioavailability

Weng

Vega

Supriatin

et al. 2010

Environ. Sci. Technol.

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A 0.01 M CaCl(2) extraction is often used to asses the bioavailability of plant nutrients in soils. However, almost no correlation was found between selenium (Se) in the soil extraction and Se content in grass. The recently developed anion Donnan membrane technique was used to analyze chemical speciation of Se in the 0.01 M CaCl(2) extractions of grassland soils and fractionation of DOC (dissolved organic carbon). The results show that most of Se (67-86%) in the extractions (15 samples) are colloidal-sized Se. Only 13-34% of extractable Se are selenate, selenite and small organic Se (<1 nm). Colloidal Se is, most likely, Se bound to or incorporated in colloidal-sized organic matter. The dominant form of small Se compounds (selenate, selenite/small organic compounds) depends on soil. A total of 47-85% of DOC is colloidal-sized and 15-53% are small organic molecules (<1 nm). In combination with soluble S (sulfur) and/or P (phosphor), concentration of small DOC can explain most of the variability of Se content in grass. The results indicate that mineralization of organic Se is the most important factor that controls Se availability in soils. Competition with sulfate and phosphate needs to be taken into account. Further research is needed to verify if concentration of small DOC is a good indicator of mineralization of soil organic matter.

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Section: Resultssupporting

confidence: 95%

Speciation of Se and DOC in Soil Solution and Their Relation to Se Bioavailability

Weng

Vega

Supriatin

et al. 2010

Environ. Sci. Technol.

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“…In this experiment, selenite was selected as the Se source because it was considered to be the major Se form in Japanese soil (Asagawa et al . 1977; Maeta and Mizuno 1993; Yamada et al . 1998).…”

Section: Methodsmentioning

confidence: 99%

Sorption behavior of selenium and antimony in soils as a function of phosphate ion concentration

Nakamaru

Sekine

2008

Soil Science and Plant Nutrition

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Both selenium (Se) and antimony (Sb) are major soil and water pollutants. Their sorption behavior in a soil-plant system was studied. Soil-soil solution distribution coefficients (K d s) for Se and Sb were measured, using a radiotracer, as an indicator of their sorption levels. Both Se and Sb behave as oxoanions ( , and ) in soil; thus, the effects of concentrations of two major oxoanions ( and ) on Se and Sb sorption were also examined. The K d values for Se for Japanese soils significantly correlated with the K d values for Sb (n = 141). The K d s of both Se and Sb similarly decreased with increasing concentration. These results indicated that the sorption of Se and Sb was similarly controlled by a ligandexchange mechanism such as phosphate sorption in soil. However, an increase in the concentration of did not decrease the K d s of Se and Sb. Furthermore, the ligand-exchangeable fractions of stable Se and Sb in major Japanese soils were determined by extraction with 0.1 mol L -1 Na 2 HPO 4 solution. For both Se and Sb, the phosphate-extractable fractions were 10-fold higher for Se and fivefold higher for Sb than their water-soluble fractions. Although the total Se and Sb amounts in soils were the same, their ligandexchangeable fractions were different. Approximately 0.9-12% of total Se and 0.2-1.3% of total Sb were extracted by the phosphate solution. These findings suggested that Se was more likely to be mobilized by the addition of phosphate than Sb. The effect of plant-available phosphate in the soil and the phosphate sorption capacity of soil on Se and Sb availabilities for plants were also examined using a pot experiment with soybean plants. The experimental results suggested that a high content of available phosphate and/or low phosphate sorption capacity of soil increased both Se and Sb availabilities to the plant. However, the results also suggested that the soil Se availability to the plant was higher than that of Sb even though the soil total Se and Sb amounts were the same.

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“…The deposition must be absolutely needed for Se transportation to surface water and aquifer area. In Japan, several studies have reported about Se content in soil (Kang et al, 1990(Kang et al, , 1991(Kang et al, , 1993Yamada et al, 1998). However, the information of Se behavior in vertical range of reservoirs is still limited.…”

Section: Introductionmentioning

confidence: 98%

Selenium Behavior in Open Bulk Precipitation, Soil Solution and Groundwater in Alluvial Fan Area in Tsukui, Central Japan

Ham

Tamiya

2006

Water Air Soil Pollut

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A monitoring study was carried out in an alluvial fan area in Tsukui, Central Japan during the study period of 1999-2003, in order to explain selenium (Se) behaviors in ecosystem combined with air, soil and groundwater. Monthly Se concentrations in open bulk precipitation (rainfall+aerosol, gaseous deposition and etc.), soil solution (collected by porous ceramic-cup) and groundwater ranged from 0.1 to 1.4 μg L −1 (volume-weighted average: 0.34 μg L −1 ), 0.21 to 1.0 μg L −1 (0.48 μg L −1 ) and 1.6 to 2.4 μg L −1 (2.2 μg L −1 ), respectively. Se concentration in open bulk precipitation was negatively correlated with the rainfall amount. Se concentration in soil solution significantly increased with DOC concentration in soil solution. Besides, despite atmospheric Se input and rainfall to the grassland study area, Se concentration in soil solution and groundwater received no significant effect from the rainfall amount, pH, Se, DOC, SO 2− 4 , NO − 3 and EC in rainfall. Even though Se concentrations in groundwater were significantly correlated with soil solution volume, Se, DOC and NO − 3 and groundwater level, the result of multiple regression analyses (MRA) indicated that the groundwater Se was negatively influenced by groundwater level, which depended on groundwater recharge. Se was transported into the groundwater through the groundwater recharge that largely increased in this alluvial fan study area after heavy rain.

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Chemical forms and stability of selenium in soil

Cited by 25 publications

References 10 publications

Speciation of Se and DOC in Soil Solution and Their Relation to Se Bioavailability

Speciation of Se and DOC in Soil Solution and Their Relation to Se Bioavailability

Sorption behavior of selenium and antimony in soils as a function of phosphate ion concentration

Selenium Behavior in Open Bulk Precipitation, Soil Solution and Groundwater in Alluvial Fan Area in Tsukui, Central Japan

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