Selenium Speciation Methods and Application to Soil Saturation Extracts from San Joaquin Valley, California

Fio, John L.; Fujii, Roger

doi:10.2136/sssaj1990.03615995005400020011x

Cited by 69 publications

(34 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water Extraction. Low levels of Se +IV species (<2% of Se inventory) in seleniferous soils are present in a water-extractable form (31). Results from a waterextraction (5 g of soil, 2 g of fly ash material; 25 mL of water) step before the use of the P-buffer indicated that 3.3, 1.0, 1.4, and 7.0% of the Se inventory was water-soluble Se +IV in the Peck, Kesterson ponds 4 and 7 soils, and NIST fly ash 1633b, respectively.…”

Section: Resultsmentioning

confidence: 99%

Selenium Speciation of Soil/Sediment Determined with Sequential Extractions and Hydride Generation Atomic Absorption Spectrophotometry

Martens

Suarez

1996

Environ. Sci. Technol.

166

109

View full text Add to dashboard Cite

Understanding the speciation of the multioxidation states of selenium is vital to predicting the mineralization, mobilization, and toxicity of the trace element in natural systems. A sequential extraction scheme (SES) was developed for identification of Se oxidation states that first employed 0.1 M (pH 7.0) K 2 HPO 4 -KH 2 PO 4 (P-buffer) to release soluble selenate (Se +VI ) and selenide (Se -II ) and ligandexchangeable selenite (Se +IV ). The second step involved oxidation of organic materials with 0.1 M K 2 S 2 O 8 (90°C) to release Se -II and Se +IV associated or occluded with organic matter. The final step used HNO 3 (90°C) to solubilize insoluble Se remaining in the sample. The solubilized Se compounds were speciated by a selective hydride generation atomic absorption spectrophotometry technique. Accuracy of the developed SES method (96-103% recovery) was verified by use of prepared Se compounds of known speciation, NIST standard reference materials, and existing seleniferous soils. The average precision (relative standard deviation) for the P-buffer extraction ranged from 5.5 to 7.7% (n ) 12); the precision of the persulfate extraction ranged from 2.6 to 8.4% (n ) 12); and the precision of the nitric acid extraction ranged from 2.8 to 7.4% (n ) 12) for three soils extracted at four different time periods.The method was applied to analyze Se species in seleniferous plant, soil, and sediment samples.

show abstract

Section: Resultsmentioning

confidence: 99%

Selenium Speciation of Soil/Sediment Determined with Sequential Extractions and Hydride Generation Atomic Absorption Spectrophotometry

Martens

Suarez

1996

Environ. Sci. Technol.

166

109

View full text Add to dashboard Cite

show abstract

“…The content of soil Se is an important environmental factor controlling the Se nutrient status of animals through plants and water (Kang 1989;Fio and Fujii 1990). Generally soil contains Se at the ppm level (Kang et al 1990), and it is assumed that Se occurs in inorganic (--II, 0, IV, and VI) and organic forms in soil.…”

mentioning

confidence: 99%

Speciation of selenium in soil

Kang¹,

Yamada²,

Kyuma³

et al. 1993

Soil Science and Plant Nutrition

View full text Add to dashboard Cite

“…Stable isotopes of hydrogen and oxygen were analyzed using methods described by Epstein and Mayeda (1953) and Kendall and Coplen (1985). Selenium-speciation analyses of water samples were done by HGAAS (Fio and Fujii, 1990). The selenium-speciation analyses were done by the USGS in Sacramento, Calif. (R.F.…”

Section: Sample Collection and Analytical Methodsmentioning

confidence: 99%

“…The KC1 extract was considered an approximation of soluble selenium, and the K2HPO4 extract an approximation of the adsorbed selenium on the sediment. Selenite concentrations were determined in each extract by methods described by Fio and Fujii (1990). Most of the selenate selenium probably was extracted by KC1; therefore, the nonselenite fraction in the KC1 extract was assumed to be selenate.…”

Section: Sample Collection and Analytical Methodsmentioning

confidence: 99%

“…Selected sediment-core, bedrock-core, and topical samples were analyzed for (1) major and trace constituents by ICP-AES (Crock and others, 1983); (2) selenium and arsenic by continuous-flow HGAAS (Crock and Lichte, 1982;Sanzolone and Chao, 1987); (3) uranium and thorium by delayed neutron-activation counting (McKown and Mallard, 1987); and (4) total organic carbon by combustioninfrared detection (Jackson and others, 1987). Sequential extractions were performed on selected sediment-core samples (Fio and Fujii, 1990), and selenium speciation of the extraction fluids was performed by column chromatography and HGAAS (Makita and Fujii, 1992). X-ray diffraction (XRD) analyses were performed on bedrock, shale residuum, alluvium, and ground-water-filter residuum samples by L.M.…”

Section: Ground-water Investigations 23 Sample Collection and Analytimentioning

confidence: 99%

See 1 more Smart Citation

Detailed study of selenium and other constituents in water, bottom sediment, soil, alfalfa, and biota associated with irrigation drainage in the Uncompahgre Project area and in the Grand Valley, west-central Colorado, 1991-93

Butler¹,

Wright²,

Stewart³

et al. 1996

View full text Add to dashboard Cite

Selenium Speciation Methods and Application to Soil Saturation Extracts from San Joaquin Valley, California

Cited by 69 publications

References 0 publications

Selenium Speciation of Soil/Sediment Determined with Sequential Extractions and Hydride Generation Atomic Absorption Spectrophotometry

Selenium Speciation of Soil/Sediment Determined with Sequential Extractions and Hydride Generation Atomic Absorption Spectrophotometry

Speciation of selenium in soil

Detailed study of selenium and other constituents in water, bottom sediment, soil, alfalfa, and biota associated with irrigation drainage in the Uncompahgre Project area and in the Grand Valley, west-central Colorado, 1991-93

Contact Info

Product

Resources

About