A review of high arsenic groundwater in Mainland and Taiwan, China: Distribution, characteristics and geochemical processes

Guo, Huaming; Wen, Donghui; Liu, Zeyun; Jia, Yongfeng; Guo, Qi

doi:10.1016/j.apgeochem.2013.12.016

Cited by 296 publications

(93 citation statements)

References 106 publications

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“…Relative to FS, decreases in concentrations of Fe, Mn, and As in CS were 26.6, 17.1, and 21.9 %, respectively. It showed that As may be associated with Fe/Mn oxide minerals (Goldberg and Johnstonm 2001;Mohan and Pittman 2007;Guo et al 2014) rather than Al (Kim et al 2014) in the sediment used in this study. The decreases in TIC and Ca were 0.53 and 0.60 mol kg −1 , respectively, which indicated that CaCO 3 was partly present in fine particles (<0.0374 mm).…”

Section: Sediments Characteristicsmentioning

confidence: 99%

“…Iron(III) (hydr)oxides are the main As-bearing minerals in aquifer sediments, which are predominantly positively charged at pH 3.0-7.0 and predominantly negatively charged at pH 8.0-10.0 (Guo et al 2014). Therefore, an increase in pH to >8.2 will drastically decrease the amount of As adsorbed onto Fe (hydr)oxides (Qiao et al 2012;Mamindy-Pajany et al 2011) due to the electrostatic repulsion.…”

Section: Introductionmentioning

confidence: 99%

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Arsenic Adsorption and its Fractions on Aquifer Sediment: Effect of pH, Arsenic Species, and Iron/Manganese Minerals

Guo

Lei

et al. 2015

Water Air Soil Pollut

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Effects of pH, As species, and Fe/Mn minerals on the fractions of adsorbed As in aquifer sediments were evaluated. Kinetic data showed that As adsorption was controlled by diffusion through the external film. Isothermal data of both As(III) and As(V) fitted the Langmuir isotherm well, revealing a monolayer adsorption process. Sequential extraction demonstrated that water-soluble As and non-specifically sorbed As were the major fractions of adsorbed As. Assessing the relationship between the Freundlich K F and the increases in the amounts of As fractions showed that the pH played a key role in weakly adsorbed As, especially water-soluble As. Although inorganic As species converted each other during the adsorption processes, more non-specifically sorbed As was adsorbed in As(V)-treated sediment than in As(III)-treated sediment, showing that the electrostatic selectivity controlled the non-specific adsorption.Additionally, specifically sorbed As and As associated with the amorphous phases were predominated by Fe/ Mn minerals, especially Fe(III) (hydr)oxides. These results suggested that pH, As species, and Fe/Mn minerals would regulate the As fractions in aquifer sediments, and therefore control As cycling in aquifer systems.

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Section: Sediments Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Arsenic Adsorption and its Fractions on Aquifer Sediment: Effect of pH, Arsenic Species, and Iron/Manganese Minerals

Guo

Lei

et al. 2015

Water Air Soil Pollut

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“…Elevated As levels in groundwater were found in two neighboring catchments including the Chianan Plain and the southern Choushui River alluvial fan in Taiwan [21,67,137,162,176]. The reduction potential in the Chianan Plain is stronger than that of the Choushui River alluvial fan, and the difference in reduction potentials between these two vicinal areas is believed to be the cause of the exceptional concentrations of As in groundwaters [177,178].…”

Section: Taiwanmentioning

confidence: 99%

“…An analysis of groundwaters from 20 of 34 provinces revealed high levels of As contamination [161][162][163], and most of the As-contaminated groundwater systems are located in the arid to semiarid inland basins as well as river deltas [161,[164][165][166]. Shallow groundwaters, distributed mostly in northwestern China, contain high As concentrations in alluvial-lacustrine or lacustrine sediment aquifers while the fluvialmarine sedimentary aquifers in the river deltas mostly are responsible for the highest As contamination of groundwaters in China [48,[165][166][167][168][169][170][171].…”

Section: Chinamentioning

confidence: 99%

Natural Arsenic in Global Groundwaters: Distribution and Geochemical Triggers for Mobilization

et al. 2016

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The elevated concentration of arsenic (As) in the groundwaters of many countries worldwide has received much attention during recent decades. This article presents an overview of the natural geochemical processes that mobilize As from aquifer sediments into groundwater and provides a concise description of the distribution of As in different global groundwater systems, with an emphasis on the highly vulnerable regions of Southeast Asia, the USA, Latin America, and Europe. Natural biogeochemical processes and anthropogenic activities may lead to the contamination of groundwaters by increased As concentrations. The primary source of As in groundwater is predominantly natural (geogenic) and mobilized through complex biogeochemical interactions within various aquifer solids and water. Sulfide minerals such as arsenopyrite and As-substituted pyrite, as well as other sulfide minerals, are susceptible to oxidation in the near-surface environment and quantitatively release significant quantities of As in the sediments. The geochemistry of As generally is a function of its multiple oxidation states, speciation, and redox transformation. The reductive dissolution of As-bearing Fe(III) oxides and sulfide oxidation are the most common and significant geochemical triggers that release As from aquifer sediments into groundwaters. The mobilization of As in groundwater is controlled by adsorption onto metal oxyhydroxides and clay minerals. According to recent estimates, more than 130 million people worldwide potentially are exposed to As in drinking water at levels above the World Health Organization's (WHO's) guideline value of 10 μg/L. Hence, community education to strengthen public awareness, the involvement and capacity building of local stakeholders in targeting As-safe aquifers, and direct action and implementation of best practices in identifying safe groundwater sources for the installation of safe drinking water wells through action and enforcement by local governments and international water sector professionals are urgent necessities for sustainable As mitigation on a global scale.

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“…Both processes are to a great extent influenced by coexisting substances such as natural organic matters (NOM) and anions. It has been well documented that such substances may reduce arsenic adsorption and enhance arsenic transport through adsorption competition, complexation reactions, anion exchange and electrostatic repulsion (Barringer et al, 2011;Dias et al, 2009;Garcia-Sanchez et al, 2010;Garcia et al, 2007;Guo et al, 2014;He et al, 2010;Radloff et al, 2007;Reza et al, 2010;Serfes et al, 2003;Zheng et al, 2004). Thus, through such mechanisms, surfactant molecules may potentially influence arsenic adsorption and transport behavior in the environment.…”

Section: Introductionmentioning

confidence: 99%

Arsenic retention and transport behavior in the presence of typical anionic and nonionic surfactants

Liang

Wang

Peng

2016

Journal of Environmental Sciences

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The massive production and wide use of surfactants have resulted in a large amount of surfactant residuals being discharged into the environment, which could have an impact on arsenic behavior. In the present study, the influence of the anionic surfactant sodium dodecyl benzene sulfonate (SDBS) and nonionic surfactant polyethylene glycol octylphenyl ether (Triton X-100) on arsenic behavior was investigated in batch and column tests. The presence of SDBS and Triton X-100 reduced arsenic retention onto ferrihydrite (FH), enhanced arsenic transport through FH coated sand (FH-sand) columns and promoted arsenic release from the FH surface. With coexisting surfactants in solution, the equilibrium adsorbed amount of arsenic on FH decreased by up to 29.7% and the adsorption rate decreased by up to 52.3%.Pre-coating with surfactants caused a decrease in the adsorbed amount and adsorption rate of arsenic by up to 15.1% and 58.3%, respectively. Because of the adsorption attenuation caused by surfactants, breakthrough of As(V) and As(III) with SDBS in columns packed with FH-sand was 23.8% and 14.3% faster than that in those without SDBS, respectively. In columns packed with SDBS-coated FH-sand, transport of arsenic was enhanced to a greater extent.Breakthrough of As(V) and As(III) was 52.4% and 43.8% faster and the cumulative retention amount was 44.5% and 57.3% less than that in pure FH-sand column systems, respectively.Mobilization of arsenic by surfactants increased with the increase of the initial adsorbed amount of arsenic. The cumulative release amount of As(V) and As(III) from the packed column reached 10.8% and 36.0%, respectively.

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A review of high arsenic groundwater in Mainland and Taiwan, China: Distribution, characteristics and geochemical processes

Cited by 296 publications

References 106 publications

Arsenic Adsorption and its Fractions on Aquifer Sediment: Effect of pH, Arsenic Species, and Iron/Manganese Minerals

Arsenic Adsorption and its Fractions on Aquifer Sediment: Effect of pH, Arsenic Species, and Iron/Manganese Minerals

Natural Arsenic in Global Groundwaters: Distribution and Geochemical Triggers for Mobilization

Arsenic retention and transport behavior in the presence of typical anionic and nonionic surfactants

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