Determining selenium in plant tissue with optimal digestion conditions

Bañuelos, Gary S.; Pflaum, T.

doi:10.1080/00103629009368335

Cited by 21 publications

(13 citation statements)

References 10 publications

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“…Plants were oven-dried at 45°C in a forced draft oven for 7 days and ground in a stainless steel Wiley mill equipped with a 2-mesh (850-m) sieve. Selenium in plant tissues was determined by atomic absorption with continuous hydride generation after wet acid digestion as described by Bañuelos and Pflaum (1990). The NIST wheat flour (SRM 1567; Se content of 1.1 ± 0.2 mg kg −1 ) was used as a quality control standard for plant Se analyses.…”

Section: Methodsmentioning

confidence: 99%

Selenium-Induced Growth Reduction inBrassicaLand Races Considered for Phytoremediation

Bañuelos

Ajwa

et al. 1997

Ecotoxicology and Environmental Safety

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Section: Methodsmentioning

confidence: 99%

Selenium-Induced Growth Reduction inBrassicaLand Races Considered for Phytoremediation

Bañuelos

Ajwa

et al. 1997

Ecotoxicology and Environmental Safety

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“…1987 data are for period from planting to harvest. (Banuelos and Pflaum 1990). Only ECe, C1, SO4, Se and B analyses will be reported in this paper.…”

Section: Field Experiments Descriptionmentioning

confidence: 99%

Long term use of saline water for irrigation

Ayars¹,

Hutmacher²,

Schoneman³

et al. 1993

Irrig Sci

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Use of saline drainage water in irrigated agriculture, as a means of its disposal, was evaluated on a 60 ha site on the west side of the San Joaquin Valley. In the drip irrigation treatments, 50 to 59 % of the irrigation water applied during the six-year rotation was saline with an ECw ranging from 7 to 8 dS/m, and containing 5 to 7 mg/L boron and 220 to 310 gg/L total selenium. Low salinity water with an ECw of 0.4 to 0.5 dS/m and B ~ 0.4 mg/1 was used to irrigate the furrow plots from 1982 to 1985 after which a blend of good quality water and saline drainage water was used. A six-year rotation of cotton, cotton, cotton, wheat, sugar beet and cotton was used. While the cotton and sugar beet yields were not affected during the initial six years, the levels of boron (B) in the soil became quite high and were accumulated in plant tissue to near toxic levels. During the six year period, for treatments surface irrigated with saline drainage water or a blend of saline and low salinity water, the B concentration in the soil increased throughout the 1.5 m soil profile while the electrical conductivity (ECe) increased primarily in the upper 1 m of the profile. Increases in soil ECe during the entire rotation occurred on plots where minimal leaching was practiced. Potential problems with germination and seedling establishment associated with increased surface soil salinity were avoided by leaching with rainfall and low-salinity pre-plant irrigations of 150 mm or more. Accumulation of boron and selenium poses a major threat to the sustainability of agriculture if drainage volumes are to be reduced by using drainage water for irrigation. This is particularly true in areas where toxic materials (salt, boron, other toxic minor elements) cannot be removed from the irrigated area. Continual storage within the root zone of the cropped soil is not sustainable.

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“…After measuring Se volatilization for 5 d, the Indian mustard or muskgrass was washed thoroughly in running water to remove any Se adhering to the tissue, and was dried at 55°C for 3 d. Roots and shoots of Indian mustard and whole tissue of muskgrass were weighed and ground separately using a Wiley mill. The tissues were digested by stepwise additions of 70% (w/v) nitric acid, 30% (w/v) hydrogen peroxide, and concentrated HCl at 95°C in a modification of EPA protocols 3052 B and 7742 (Bañ uelos and Pflaum 1990). A wheat flour standard (National Institute of Science and Technology, 1.1 mg of Se kg Ϫ1 ) and a blank were used with all digestions.…”

Section: Methodsmentioning

confidence: 99%

Selenium Assimilation and Volatilization from Selenocyanate-Treated Indian Mustard and Muskgrass

et al. 2002

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Selenocyanate (SeCN−) is a major contaminant in the effluents from some oil refineries, power plants, and in mine drainage water. In this study, we determined the potential of Indian mustard (Brassica juncea) and muskgrass (a macroalga,Chara canescens) for SeCN− phytoremediation in upland and wetland situations, respectively. The tolerance of Indian mustard to toxic levels of SeCN− was similar to or higher than other toxic forms of Se. Indian mustard treated with 20 μm SeCN− removed 30% (w/v) of the Se supplied in 5 d, accumulating 554 and 86 μg of Se g−1 dry weight in roots and shoots, respectively. Under similar conditions, muskgrass removed approximately 9% (w/v) of the Se supplied as SeCN− and accumulated 27 μg of Se g−1 dry weight. A biochemical pathway for SeCN− degradation was proposed for Indian mustard. Indian mustard and muskgrass efficiently degraded SeCN− as none of the Se accumulated by either organism remained in this form. Indian mustard accumulated predominantly organic Se, whereas muskgrass contained Se mainly as selenite and organic Se forms. Indian mustard produced volatile Se from SeCN− in the form of less toxic dimethylselenide. Se volatilization by Indian mustard accounted for only 0.7% (w/v) of the SeCN− removed, likely because the biochemical steps in the production of dimethylselenide from organic Se were rate limiting. Indian mustard is promising for the phytoremediation of SeCN−-contaminated soil and water because of its remarkable abilities to phytoextract SeCN−and degrade all the accumulated SeCN− to other Se forms.

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Determining selenium in plant tissue with optimal digestion conditions

Cited by 21 publications

References 10 publications

Selenium-Induced Growth Reduction inBrassicaLand Races Considered for Phytoremediation

Selenium-Induced Growth Reduction inBrassicaLand Races Considered for Phytoremediation

Long term use of saline water for irrigation

Selenium Assimilation and Volatilization from Selenocyanate-Treated Indian Mustard and Muskgrass

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