Irrigation‐Induced Contamination: How Real a Problem?

Deason, Jonathan P.

doi:10.1061/(asce)0733-9437(1989)115:1(9)

Cited by 16 publications

(6 citation statements)

References 7 publications

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“…In the western United States, discharge of saline agricultural drainage water into surface impoundments and wetlands has led to increasing concern about ecotoxicological effects of a number of trace elements [10]. Although of natural geochemical occurrence, these trace elements are progressively concentrated because of high evaporative water losses, first from agricultural soils, then from evaporation ponds or wetlands into which drainage water is discharged.…”

Section: Introductionmentioning

confidence: 99%

“…Although of natural geochemical occurrence, these trace elements are progressively concentrated because of high evaporative water losses, first from agricultural soils, then from evaporation ponds or wetlands into which drainage water is discharged. Included are trace elements such as AsO 4 , MoO 4 , SeO 4 , and HVO 4 , which normally exist as oxyanions in oxic waters and may pose food‐chain transfer hazards to wildlife, livestock, or humans [10,11]. As part of a larger study of vegetation management options for dewatered and exposed sediments at Kesterson National Wildlife Refuge and other sites in California [11], we have been examining how soil solution composition affects plant uptake of trace elements, particularly Se [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Effects of ion pairing with calcium and magnesium on selenate availability to higher plants

Parker

Tice

Thomason

1997

Enviro Toxic and Chemistry

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Abstract-The effects of solution speciation on the bioavailability of trace metals are well documented, but the role of speciation in the bioavailability of oxyanionic trace elements that may form significant ion pairs with Ca and Mg in saline media has not been investigated. We assessed the effects of such ion pairing on the availability of selenate to representative monocotyledonous and dicotyledonous higher plants. Formation constants for the and ion pairs were experimentally determined using 0 0CaSO CaSeO 4 4 a Ca 2ϩ ion-selective electrode. The published value of 10 2.3 for formation was confirmed, but the value of 10 2.7 for 0 CaSO 4 was found to be in error; a value of 10 2.0 is proposed here as the correct formation constant. Five solution culture experiments 0 CaSeO 4 were conducted using alfalfa (Medicago sativa L.) or tall wheatgrass (Elytrigia pontica [Podp.] Holub) with treatments consisting of NaSeO 4 levels in combination with various levels of MgCl 2 or CaCl 2 . Both shoot Se concentrations and whole-plant Se contents were highly correlated with the free activity but were poorly correlated with the sum of the free ion plus Ca and Mg ion 2ϪSeO 4 pair species. Thus, we have shown, for the first time, that the free ion model of trace metal bioavailability is also valid for oxyanions that form complexes with Ca and Mg in saline media but that this conclusion hinges critically on the accuracy of the pertinent formation constants.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of ion pairing with calcium and magnesium on selenate availability to higher plants

Parker

Tice

Thomason

1997

Enviro Toxic and Chemistry

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“…As a result of man's activities, selenium has been found to be an environmental problem in a number of terrestrial and freshwater systems in recent years. Power generation [1,2] and agricultural subsurface drainage water [3,4] have been implicated in the release of harmful levels of selenium to the environment. Sewage sludge and petrochemical refining are also significant sources of selenium [5,6].…”

Section: Introductionmentioning

confidence: 99%

THE INFLUENCE OF pH AND MEDIA COMPOSITION ON THE UPTAKE OF INORGANIC SELENIUM BY CHLAMYDOMONAS REINHARDTII

Riedel¹,

Sanders²

1996

Environ Toxicol Chem

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Abstract-The uptake of inorganic selenium species, selenate and selenite, by the green alga Chlamydomonas reinhardtii Dang was examined as a function of pH over the range 5 to 9 and in media with varying concentrations of major ions and nutrients using 75 Se as a radiotracer. Little difference was noted in the uptake of selenate as a function of pH, with the maximum uptake occurring at pH 8; however, selenite uptake increased substantially at the lower pH values. Selenate uptake was significantly decreased by higher sulfate concentrations and increased significantly by calcium, magnesium, and ammonium. Selenite uptake was significantly increased when the phosphate concentrations in the media were reduced. The results of these experiments demonstrate that varying water chemistry may significantly affect the uptake of inorganic selenium by phytoplankton and the subsequent transfer of the selenium to higher trophic levels.

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“…About 600 irrigation projects and major wildlife resource areas have been constructed or are managed in 17 Western States by DOI bureaus. The program evolved into five phases (Deason, 1986): (1) Site identification, (2) reconnaissance investigations, (3) detailed studies, (4) planning, and (5) remediation. Activities in the first three phases are conducted by study teams consisting of scientists from the U.S. Geological Survey (USGS), the FWS, the Bureau of Reclamation (BOR), and the Bureau of Indian Affairs.…”

Section: Introductionmentioning

confidence: 99%

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

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Irrigation‐Induced Contamination: How Real a Problem?

Cited by 16 publications

References 7 publications

Effects of ion pairing with calcium and magnesium on selenate availability to higher plants

Effects of ion pairing with calcium and magnesium on selenate availability to higher plants

THE INFLUENCE OF pH AND MEDIA COMPOSITION ON THE UPTAKE OF INORGANIC SELENIUM BY CHLAMYDOMONAS REINHARDTII

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

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