The Predominance of Inorganic Arsenic Species in Plants from Yellowknife, Northwest Territories, Canada

Koch, Iris; Wang, Lixia; Ollson, Chris; Cullen, William R.; Reimer, Kenneth J.

doi:10.1021/es9906756

Cited by 159 publications

(89 citation statements)

References 25 publications

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“…Similar to other studies on higher plants (e.g. Koch et al, 2000;Quaghebeur and Rengel, 2003;Raab et al, 2005;Xu et al, 2007), we found arsenite and arsenate to be the dominant forms of As in the two strains of Azolla, with methylated As compounds accounting for <5% of the total As. However, the two Azolla strains showed a significant difference in the proportions of arsenite versus arsenate, with A. filiculoides having a higher percentage of arsenite (55-70%) than A. caroliniana (25-40%) (Fig.…”

Section: Discussionsupporting

confidence: 90%

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Arsenic accumulation by the aquatic fern Azolla: Comparison of arsenate uptake, speciation and efflux by A. caroliniana and A. filiculoides

Zhang

Lin

Zhao

et al. 2008

Environmental Pollution

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Arsenic accumulation and efflux differ between strains of the aquatic fern Azolla. This study investigates As accumulation and tolerance of the aquatic fern Azolla. Fifty strains of Azolla showed a large variation in As accumulation. The highest-and lowest-accumulating ferns among the 50 strains were chosen for further investigations. Azolla caroliniana accumulated two times more As than Azolla filiculoides owing to a higher influx velocity for arsenate. A. filiculoides was more resistant to external arsenate due to a lower uptake. Both strains showed a similar degree of tolerance to internal As. Arsenate and arsenite were the dominant As species in both Azolla strains, with methlyated As species accounting for <5% of the total As. A. filiculoides had a higher proportion of arsenite than A. caroliniana. Both strains effluxed more arsenate than arsenite, and the amount of As efflux was proportional to the amount of As accumulation. The potential of growing Azolla in paddy fields to reduce As transfer from soil and water to rice should be further evaluated. a r t i c l e i n f o

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Section: Discussionsupporting

confidence: 90%

“…A small percentage of As may also be transformed into organic species such as methylated As compounds and arsenosugars (Koch et al, 2000). Similar to other studies on higher plants (e.g.…”

Section: Discussionsupporting

confidence: 89%

Arsenic accumulation by the aquatic fern Azolla: Comparison of arsenate uptake, speciation and efflux by A. caroliniana and A. filiculoides

Zhang

Lin

Zhao

et al. 2008

Environmental Pollution

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“…Arsenic was almost quantitatively extracted from the samples with the lowest total arsenic concentration, whereas in the samples with the highest total arsenic concentration less than 25% was extractable. In the case of aboveground plant biomass, poor extractability of arsenic compounds not exceeding 50% of total arsenic content was observed similarly as in our previous experiments [34] and reported by other authors [44]. Similarly, Ruiz-Chancho et al [45] reported extraction efficiencies ranging from 3.0% to 41.4%, with good agreement between samples from the same plant species where different extraction procedures with different ratios of water and methanol were compared.…”

Section: Contents Of Investigated Elements and Arsenic Compounds In Rsupporting

confidence: 89%

“…Therefore, the abundance and distribution of arsenic compounds within red beet plants did not differ significantly from the behavior of arsenic compounds in other plant species and the results were expectable. Comparable results have been presented by other authors within different plant species [16,19,20,44].…”

Section: Contents Of Investigated Elements and Arsenic Compounds In Rsupporting

confidence: 85%

The contents of risk elements, arsenic speciation, and possible interactions of elements and betalains in beetroot (Beta vulgaris, L.) growing in contaminated soil

et al. 2010

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Abstract:The effect of enhanced soil risk element contents on the uptake of As, Cd, Pb, and Zn was determined in two pot experiments.Simultaneously, transformation of arsenic and its compounds in beetroot (Beta vulgaris L.) plants was investigated. The mobile fractions of elements were determined in 0.05 mol L -1 (NH 4 ) 2 SO 4 extracts and did not exceed 2% of total soil arsenic, 9% of total cadmium, 3% of total lead, and 8% of total zinc, respectively. Although the soils were extremely contaminated the mobile portions of the elements represented only a small fragment of the total element content. Arsenic contents in beet plants reached up to 25 mg As kg -1 in roots and 48 mg As kg -1 in leaves in the soil characterized by the highest mobile arsenic portion. Arsenic portions extractable with water and phosphate buffer from the beetroot samples did not show significant differences between the extraction agents but the extractability was affected by the arsenic concentration. Arsenic was almost quantitatively extractable from the samples with the lowest total arsenic concentration, whereas in the samples with the highest total arsenic concentration less than 25% was extractable. Arsenate was the dominant arsenic compound in the extracts (70% in phosphate buffer, 50% in water extracts). A small portion of dimethylarsinic acid, not exceeding 0.5%, was detected only in the sample growing in the soil with the highest arsenic concentration. The role of betalains (betanin, isobetanin, vulgaxanthin I and vulgaxanthin II) in transformation/detoxification of arsenic in plants was not confirmed in this experiment because the plants were able to grow in the contaminated soil without any symptoms of arsenic toxicity.

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“…A small percentage of organic compounds of As have been reported, for example in stems and leaves of pepper plants [20], and have been described by other authors in many different plant species [29,30], but were not detected in the mint samples. In the case of aboveground plant biomass, poor extractability of As compounds (not exceeding 50% of total As concentration) has been reported previously [20,31]. The results can be affected by the presence of As-phytochelatin complexes found in various plant species [6,32,33].…”

Section: C) Standard Deviation Was Not Calculated Because Of Low Numbmentioning

confidence: 84%

A comparison of arsenic mobility in Phaseolus vulgaris, Mentha aquatica, and Pteris cretica rhizosphere

et al. 2009

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The ability of Phaseolus vulgaris, Mentha aquatica, and Pteris cretica to release arsenic (As) species from contaminated soil was tested in rhizobox experiments in three soils differing in their physicochemical parameters and total and mobile As concentration. Relatively low uptake of arsenic by P. vulgaris and M. aquatica resulted in very low and ambiguous changes in rhizosphere soil compared to bulk soil. However, there were observed differences in the distribution of the mobile As portion in soil to individual As species as affected by plant species and/or plantation conditions of these plants. Higher percentage of mobile arsenite in mint rhizosphere seems to be related to more reducing conditions during cultivation of these wetland plants. P. cretica planted in the soils containing between 36 and 1436 mg As kg−1 was able to accumulate between 80 and 500 mg As kg−1 in aboveground biomass. The extractable concentrations of As compounds in rhizosphere soil of P. cretica showed a clear depletion of arsenate (representing more than 90% of extractable arsenic) with the distance from plant roots. However, the As uptake mechanisms, as well as As transformation within hyperaccumulating fern plants, differ substantially from those in higher plants. Therefore the finding of suitable higher plant tolerant to the As soil contamination with good ability to accumulate As in aboveground biomass remains for the further research.

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The Predominance of Inorganic Arsenic Species in Plants from Yellowknife, Northwest Territories, Canada

Cited by 159 publications

References 25 publications

Arsenic accumulation by the aquatic fern Azolla: Comparison of arsenate uptake, speciation and efflux by A. caroliniana and A. filiculoides

Arsenic accumulation by the aquatic fern Azolla: Comparison of arsenate uptake, speciation and efflux by A. caroliniana and A. filiculoides

The contents of risk elements, arsenic speciation, and possible interactions of elements and betalains in beetroot (Beta vulgaris, L.) growing in contaminated soil

A comparison of arsenic mobility in Phaseolus vulgaris, Mentha aquatica, and Pteris cretica rhizosphere

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