Arsenic content, fractionation, and ecological risk in the surface sediments of lake

Wang, S. L.; Lin, Chunye; Cao, Xuezhi; Zhong, Xinghua

doi:10.1007/s13762-011-0015-5

Cited by 15 publications

(6 citation statements)

References 30 publications

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“…The reason was that the speciation of metals was influenced not only by its geochemistry characteristics but also by the human activities and the physical and chemical features of the sediments (Feng et al 2009;Wang et al 2012).…”

Section: Speciation Of Heavy Metals and Metalloid In Sedimentsmentioning

confidence: 99%

Speciation and ecological risk of heavy metals and metalloid in the sediments of Zhalong Wetland in China

Zang

Xiao

et al. 2013

Int. J. Environ. Sci. Technol.

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A total of 271 sediments samples from the Zhalong Wetland were analyzed for concentration and distribution of Hg, Cd, As, Cu, Pb, Zn, Cr, and Zn; their speciation according to the modified European Community Bureau of Reference sequential extraction procedures and their ecological risk based on Lars Hakanson's potential ecological risk assessment and risk assessment code were made. The results can be summarized as the followings: (1) Concentrations of all metals measured were above soil background values of Songnen Plain, and their spatial distributions were distinctly different. The concentrations of metals (except Pb) were high in the east, followed by the north, and were relatively low in the core zone and south. The concentration of Pb was high in the north, south, and west, compared with low concentration in the core zone and east. (2) The dominant proportion of Pb, Zn, and Cr was in the residual fraction, suggesting that they were environmental stable. The concentrations of Cu and As in the reducible fraction, the concentration of Cd in the acidsoluble fraction, and the concentration of Hg in the oxidizable fraction were relatively high, indicating they had greater environmental effects. (3) The evaluation of the ecological risk showed that Cd, Hg, and As had relatively high ecological risk index, especially the ecological risk of Cd should be paid attention to. In general, the ecological risk of the heavy metals and metalloid by zone was experimental zone [ buffering zone [ ecological tourism zone [ core zone.

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Section: Speciation Of Heavy Metals and Metalloid In Sedimentsmentioning

confidence: 99%

Speciation and ecological risk of heavy metals and metalloid in the sediments of Zhalong Wetland in China

Zang

Xiao

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Concentrations of K, Na, Ca, Mg, Fe, and Al in the water were measured using inductively coupled plasma mass spectroscopy (ICP-MS, X Series II, Thermo Electon, Waltham, MA, USA). Concentration of As in the water were determined using hydride generation-atomic fluorescence spectrometry (HG-AFS, Haiguang Instruments, Beijing, China) [33,34]. To determine the total As concentration, the water samples were pretreated with thiourea to reduce all As to As(III) prior to hydride generation.…”

Section: Sample Analysismentioning

confidence: 99%

Distribution and Geochemical Processes of Arsenic in Lake Qinghai Basin, China

Cao

Lin

Zhang

2021

Water

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Lake Qinghai in the Qinghai-Tibet plateau is the largest lake in China, but the geochemical understanding of arsenic (As) in the lake is lacking. Water, sediment, and soil samples were collected from Lake Qinghai, rivers flowing into the lake, and lands around the lake. Water samples were analyzed for major ions and As, while sediment and soil samples were analyzed for major elements and As. The average As concentration (25.55 μg L−1) in the lake water was significantly higher than that (1.39 μg L−1) in the river water (p < 0.05), due to the evaporative concentration of lake water. The average As concentration (107.8 μg L−1) in the pore water was significantly higher than that in the lake water, due to its secondary release from sediment solid phases in the reductive condition. The average As/Cl−, As/SO42− and As/Na molar ratios in the lake water were significantly lower than that in the river water, indicating As was partially transferred from dissolved phase to solid phase in the evaporative concentration process of the lake water. The average As/Ca molar ratio in the lake water was significantly higher than that in the river water, indicating more Ca than As precipitated in the lake water. Furthermore, the average As/Ca molar ratio in the lake water was significantly lower than that in the pore water, indicating more As than Ca was secondarily released from sediment solid phases. The average concentration of As(III) and As(V) were 0.35 and 1.04 μg L−1 for the river water, respectively, and 6.99 and 18.56 μg L−1 for the lake water, indicating As(V) was the predominant As form. The average As concentration was 16.75 mg kg−1 for the lake sediment and 13.14 mg kg−1 for the soil around the lake. Arsenic concentration was significantly negatively correlated with S and Ca concentration in the lake sediments, due to solid dilution effect induced by carbonate and sulfate precipitation. The average As/Sc molar ratio in the sediment (2.06) was significantly higher than that in the soil (1.32), indicating that relatively more As was enriched in the lake sediment.

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“…The dominant proportion of As was found in the humic acid and reducible fractions among the non-residual fractions. This may be the result of their great abundance, specific surface area, and stronger binding affinity (Wang et al 2012). A dominant proportion of Pb was found in the F5 fraction, in which Pb existed as oxides and may be released if the sediment was subjected to stronger reducing conditions (Panda et al 1995).…”

Section: Fractionation and Bioavailability Of Heavy Metalsmentioning

confidence: 99%

“…In recent decades, Nansi Lake and its tributaries have been contaminated by the untreated effluents from industrial and municipal activities, runoff from mining sites and agricultural lands, and deposition of air pollutants (Wang et al 2012). Therefore, the present study was conducted to meet the following objectives: (i) to analyze geochemical speciation of heavy metals in surface sediments of Nansi Lake; (ii) to analyze the level of heavy metal pollution in surface sediments using pollution index (P i ) and pollution load index (PLI); and (iii) to explore the spatial distribution of the non-residual fraction of studied heavy metals using principal component analysis.…”

Section: Introductionmentioning

confidence: 99%

Geochemical speciation and pollution assessment of heavy metals in surface sediments from Nansi Lake, China

Yang

Wang

et al. 2015

Environ Monit Assess

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Sixteen surface sediment samples were collected from Nansi Lake to analyze geochemical speciation of heavy metals including Cd, As, Pb, Cr, and Zn, assess their pollution level, and determine the spatial distribution of the non-residual fraction. Results showed that Cd had higher concentrations in water-soluble and exchangeable fractions. As and Pb were mainly observed as humic acid and reducible fractions among the non-residual fractions, while Cr and Zn were mostly locked up in a residual fraction. The mean pollution index (P i ) values revealed that the lower lake generally had a higher enrichment degree than the upper lake. Cd (2.73) and As (2.05) were in moderate level of pollution, while the pollution of Pb (1.80), Cr (1.27), and Zn (1.02) appeared at low-level pollution. The calculated pollution load index (PLI) suggested the upper lake suffered from borderline moderate pollution, while the lower lake showed moderate to heavy pollution. Spatial principle component analysis showed that the first principal component (PC1) including Cd, As, and Pb could explain 56.18 % of the non-residual fraction. High values of PC1 were observed mostly in the southern part of Weishan Lake, which indicated greater bioavailability and toxicity of Cd, As, and Pb in this area.

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Arsenic content, fractionation, and ecological risk in the surface sediments of lake

Cited by 15 publications

References 30 publications

Speciation and ecological risk of heavy metals and metalloid in the sediments of Zhalong Wetland in China

Speciation and ecological risk of heavy metals and metalloid in the sediments of Zhalong Wetland in China

Distribution and Geochemical Processes of Arsenic in Lake Qinghai Basin, China

Geochemical speciation and pollution assessment of heavy metals in surface sediments from Nansi Lake, China

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