Comparison of methods to determine selenium species in saturation extracts of soils from the western San Joaquin Valley, California

Fio, John L.; Fujii, Roger

doi:10.3133/ofr88458

Cited by 6 publications

(7 citation statements)

References 6 publications

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“…Total Se concentrations in the eluates from both the XAD-8 and ion-exchange columns were within the analytical precision of the measurement techniques, and analysis of the NaOH washes indicated low recovery. This observation is consistent with recent results reported by Fio and Fujii (1988), who reported that organo-Se compounds composed only a small fraction of the total water extractable Se in selected San Joaquin Valley soils. The lack of appreciable organo-Se compounds present in the pore water samples from Pond 1 suggests that the vast majority of the difference between the total Se and the Se(IV), as detennined by the methods described above, is in the Se(VO fonn.…”

Section: Methodssupporting

confidence: 83%

“…Attempts were made to isolate organo-Se compounds from representative samples at 3 sites of the test plots~ Using a modification of the procedure described by Fio and Fujii (1988), 5 ml of acidified field sample (pH 2.2) was passed through a 2-cm long XAD-8 resin column to separate hydrophobic, neutral organo-Se compounds. The sample was followed by.5 ml of0.1 M HCL as the eluate.…”

Section: Methodsmentioning

confidence: 99%

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Selenium Immobilization in a Pond Sediment at Kesterson Reservoir

et al. 1990

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Kesterson Reservoir, Merced County, CA, a disposal facility for agricultural drain water, became the object of intense scientific investigation following discovery in 1983 that Se‐laden agricultural drain water was having serious effects on the reproductive success of waterfowl. A remedial measure involving permanent flooding with low‐Se water, aimed at taking advantage of low Se solubility under reducing conditions, was proposed as a means of limiting Se movement into groundwater and biota. A field experiment was undertaken to evaluate the feasibility of the proposed remedial measure, its impact on the quality of shallow groundwater and for quantifying Se immobilization and transport through a newly flooded pond bottom soil. Extensive soil water and groundwater sampling demonstrated that although initial soluble Se concentrations in the top 1.22 m (4 ft) of soil typically ranged from approximately 1000 to 3000 µg L−1, Se concentrations declined dramatically after flooding and elevated concentrations below 1.22 m were observed at only one of five sampling sites. Analysis of the temporal and spatial changes in the distribution of dissolved Se and Cl− indicated that 66 to 108% of the initial soluble Se present in the top 1.22 m was immobilized shortly after flooding. These estimates were consistent with the low Se concentrations observed in shallow monitoring wells. The extent to which Se immobilization occurred correlated inversely with average pore water velocity. Data presented suggest that reducing conditions in the newly flooded soils lead to the microbially mediated transformation of selenate to less soluble or mobile forms.

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Section: Methodssupporting

confidence: 83%

Section: Methodsmentioning

confidence: 99%

Selenium Immobilization in a Pond Sediment at Kesterson Reservoir

et al. 1990

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“…Acceptably sensitive analytical methods include neutron activation, hydride-generation atomic absorption spectrophotometry, and cathodic stripping voltammetry (McKown and Morris, 1978;Jarzabek and Kublik, 1982;Brooks et al, 1983). Tissue and sediment preparation techniques appropriate for use with these methods are available (e.g., Grant, 1981;May, 1982;Krynitsky, 1987;Fio and Fujii, 1988;Brumbaugh and Walther, 1989). Analytical methods such as inductively-coupled argon plasma spectroscopy (ICAP) should be avoided if possible.…”

Section: Data Requirementsmentioning

confidence: 99%

Assessing the toxic threat of selenium to fish and aquatic birds

Lemly

1996

Environ Monit Assess

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Abstract.A procedure is given for evaluating the toxic threat of selenium to fish and wildlife. Toxic threat is expressed as hazard, and is based on the potential for food-chain bioaccumulation and reproductive impairment in fish and aquatic birds, which are the most sensitive biological responses for estimating ecosystem-level impacts of selenium contamination. Five degrees of hazard are possible depending on the expected environmental concentrations of selenium, exposure of fish and aquatic birds to toxic concentrations, and resultant potential for reproductive impairment. The degree of hazard is given a numerical score: 5 = high hazard, 4 = moderate hazard, 3 = low hazard, 2 = minimal hazard, and 1 = no identifiable hazard. A separate hazard score is given to each of five ecosystem components; water, sediments, benthic macroinvertebrates, fish eggs, and aquatic bird eggs. A final hazard characterization is determined by adding individual scores and comparing the total to the following evaluation criteria: 5 = no hazard, 6-8 = minimal hazard, 9-11 = low hazard, 12-15 = moderate hazard, 16-25 = high hazard. An example is given to illustrate how the procedure is applied to selenium data from a typical contaminant monitoring program.

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“…The analytical method for organic selenium is described in Fio and Fujii (1988). Similar distributions of selenium species also have been found for highly leached soil samples from the 15-year field.…”

Section: Soluble Selenium Species In Unsaturated Soilsmentioning

confidence: 61%

“…Analytical methods are described in Fio and Fujii (1988) . Similar results were found for four soil solutions obtained from the 2-, 3-, 4-, and 5-foot depths using porous ceramic-cup extractors at one site in the field drained for 15 years.…”

Section: Soluble Selenium Species In Unsaturated Soilsmentioning

confidence: 99%

Preliminary assessment of sources, distribution, and mobility of selenium in the San Joaquin Valley, California

Gilliom¹

1989

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Comparison of methods to determine selenium species in saturation extracts of soils from the western San Joaquin Valley, California

Cited by 6 publications

References 6 publications

Selenium Immobilization in a Pond Sediment at Kesterson Reservoir

Selenium Immobilization in a Pond Sediment at Kesterson Reservoir

Assessing the toxic threat of selenium to fish and aquatic birds

Preliminary assessment of sources, distribution, and mobility of selenium in the San Joaquin Valley, California

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