Organic arsenic removal from drinking water

Thirunavukkarasu, O. S.; Viraraghavan, T.; Subramanian, K. S.; Tanjore, S.

doi:10.1016/s1462-0758(02)00029-8

Cited by 93 publications

(55 citation statements)

References 26 publications

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“…The oAs was analyzed after separation by Al2O3 and about 2 -5% of TAs was found in groundwater samples (Table 2), indicated its lower availability. 34 The As III is more toxic and mobile than As V . 35 Because of the variation in toxicity and removal efficiency of As III and As V , knowledge about the speciation distribution in drinking water is important.…”

Section: ×100mentioning

confidence: 99%

“…36 The redox As species are unstable in natural waters, because of the transformation between As III and As V , due to the organic matrices, redox potential (Eh) and pH. 34,37 Therefore, for accurate determination of As species, all water samples were delivered on the same sampling day to laboratory and analysis of As III and As V were accomplished on same day, to avoid risk of transformation of species as has been reported elsewhere. 38 The As III concentrations ranged from 8.90 -43.2 and 6.30 -60.0 μg L -1 in water samples of hand pump and tube well, respectively (Table 2).…”

Section: ×100mentioning

confidence: 99%

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Inorganic Arsenic Speciation in Groundwater Samples Using Electrothermal Atomic Spectrometry Following Selective Separation and Cloud Point Extraction

et al. 2011

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A method has been developed for speciation of total, total inorganic and organic arsenic (As) species in groundwater samples. The inorganic species of As (III,V) were separated from organic forms by adsorbing on alumina (Al2O3) whereas the organic As was eluted out. The retained inorganic As species was eluted by 0.2 M HCl. Then eluent As III and As V were formed as complexes with ammonium pyrrolidinedithiocarbamate (APDC) and molybdate, respectively. Then As III -PDC and As V -molybdate complexes were quantitatively extracted into a non-ionic surfactant Triton X-114. The total As was determined by conventional preconcentration procedures. The resulting solutions of each method were determined by ETAAS with modifier. The main factors affecting the separation and cloud point extraction (CPE) were investigated in detail. The limits of detection values were found as 0.04 and 0.20 μg L -1 for As III and As V , respectively, whereas limits of quantification were observed as 0.13 and 0.33 μg L -1 for As III and As V , respectively. Standard addition method confirmed the accuracy. The recoveries of As III and As V were found in the range of 98 -99%. The proposed method was applied to groundwater samples collected from different areas of Sukkur district.

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Section: ×100mentioning

confidence: 99%

Section: ×100mentioning

confidence: 99%

Inorganic Arsenic Speciation in Groundwater Samples Using Electrothermal Atomic Spectrometry Following Selective Separation and Cloud Point Extraction

et al. 2011

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“…Most previous studies have focused on the removal of either inorganic or methylated As (Edwards, 1994;Thirunavukkarasu et al, 2002;USEPA, 2003;Mohan and Pittman, 2007). Although TiO 2 has been successfully applied in groundwater As(V) removal, limited information is available for simultaneous remediation of four commonly found organic and inorganic As species in contaminated groundwater.…”

mentioning

confidence: 99%

Remediation of organic and inorganic arsenic contaminated groundwater using a nanocrystalline TiO2-based adsorbent

Jing

Meng

Calvache

et al. 2009

Environmental Pollution

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“…The reduction of arsenic levels in contaminated drinking water and soils is one of the priority environmental challenges worldwide (Thirunavkukkarasu et al, 2002). In Mexico, arsenic contamination problems in water and soils have been reported in the following regions: Villa La Paz, San Luis Potosí (Gamiño-Gutiérrez et al, 2013); Matehuala, San Luis Potosí (Martínez-Villegas et al, 2013); Comarca Lagunera in NW Mexico (Ordáz et al, 2013); Zimapán, Hidalgo (Romero et al, 2008); Guanajuato (Arroyo et al, 2013); and Zacatecas and Guadalupe, Zacatecas (Mireles et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Modeling the additive effects of Pb(II) and Cu(II) on the competitive attenuation of As(V) through solid precipitation versus adsorption to goethite

Vaca-Escobar¹,

Villalobos²

2015

BSGM

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Mine-related activities cause widespread contamination of aqueous environments with high concentrations of arsenic and accompanying heavy metals. The natural attenuation of As(V) in soils and groundwater under oxic conditions occurs mainly through sorption processes to iron and aluminum (hydr)oxides; as well as through the formation of highly insoluble heavy metal(II) arsenates.In the present investigation we used thermodynamic modeling to predict the environmental geochemical behavior of As(V) in the presence of Pb(II), Cu(II) and goethite, in an effort to approach the complexity of multi-component real contaminated scenarios. The key to this modeling was the coupling of a highly robust Surface Complexation Model of As(V) adsorption to goethite, which uses combined tenets of the Triple-Layer and CD-MUSIC models, together with appropriate metal(II) arsenate solid formation constants as well as those of all chemical equilibria taking place in the aqueous phase. Mixed-metal arsenates were predicted to form and increase the predominance region of the precipitation reactions for a highly surface-reactive goethite, at the expense of the adsorption mechanism, but the model yielded no aqueous As(V) released at any condition investigated.Keywords: Adsorption, precipitation, arsenate, goethite, lead, copper, Surface Complexation Model, Triple-Layer Model, CD-MUSIC Model. Resumen Las actividades relacionadas con la minería provocan contaminación extendida de ambientes acuosos conjuntamente de arsénico y metales pesados. La atenuación natural de As(V) en suelos y acuíferos en condiciones óxicas ocurre principalmente a través de procesos de adsorción a (hidr)óxidos de hierro y aluminio; así como a través de la formación de arseniatos de metales(II) pesados altamente insolubles. En esta investigación utilizamos modelación termodinámica para predecir el comportamiento geoquímico ambiental del As(V) en presencia de Pb(II), Cu(II) y goetita, tratando de aproximarnos a la complejidad de escenarios multicomponentes de contaminación

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Organic arsenic removal from drinking water

Cited by 93 publications

References 26 publications

Inorganic Arsenic Speciation in Groundwater Samples Using Electrothermal Atomic Spectrometry Following Selective Separation and Cloud Point Extraction

Inorganic Arsenic Speciation in Groundwater Samples Using Electrothermal Atomic Spectrometry Following Selective Separation and Cloud Point Extraction

Remediation of organic and inorganic arsenic contaminated groundwater using a nanocrystalline TiO2-based adsorbent

Modeling the additive effects of Pb(II) and Cu(II) on the competitive attenuation of As(V) through solid precipitation versus adsorption to goethite

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