Combined effects of anions on arsenic removal by iron hydroxides

Meng, Xiaoguang; Korfiatis, George P.; Bang, Sunbaek; Bang, Ki Woong

doi:10.1016/s0378-4274(02)00080-2

Cited by 345 publications

(194 citation statements)

References 15 publications

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“…These complex ions may remain strongly bound to goethite up to higher pH ofS.O-S.5 (Davis and Kent, 1990;Smedley and Kinniburgh, 2002). Desorption of arsenic from goethite may occur by competition between negative charges for the positive colloid, a reduction of the iron oxide mineral phase (Meng et al, 2002), or high pH values (>S.5). Given that redox conditions in the calcines must be rather oxidative (as suggested by the very low contents of organic matter; Table 2), reduction does not seem to be a plausible mechanism for As desorption.…”

Section: �Imentioning

confidence: 99%

The Mazarrón Pb–(Ag)–Zn mining district (SE Spain) as a source of heavy metal contamination in a semiarid realm: Geochemical data from mine wastes, soils, and stream sediments

Oyarzún

Lillo

López‐García

et al. 2011

Journal of Geochemical Exploration

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Section: �Imentioning

confidence: 99%

The Mazarrón Pb–(Ag)–Zn mining district (SE Spain) as a source of heavy metal contamination in a semiarid realm: Geochemical data from mine wastes, soils, and stream sediments

Oyarzún

Lillo

López‐García

et al. 2011

Journal of Geochemical Exploration

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“…Ions that compete with arsenic for adsorption sites on similar adsorbents include carbonate [27] , bicarbonate [28] , phosphate [12,[28][29][30][31] , silicate [28,[30][31] , and nitrate [12] . Interestingly, differences in concentrations of competing ions in water samples from diverse locations (i.e.…”

Section: Groundwater In Bangladesh Contains Ions That Likely Compete mentioning

confidence: 99%

Arsenic remediation of drinking water using iron-oxide coated coal bottom ash

Mathieu

Gadgil

Addy

et al. 2010

Journal of Environmental Science and Health, Part A

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We describe laboratory and field results of a novel arsenic removal adsorbent called 'Arsenic Removal Using Bottom Ash' (ARUBA). ARUBA is prepared by coating particles of coal bottom l fired power plants, with iron (hydr)oxide. The coating process is * Address correspondence to Ashok Gadgil, Lawrence Berkeley National Laboratory, 1Cyclotron Rd MS 90R3058, Berkeley, CA 94720, USA; Phone: Email: ajgadgil@lbl.gov. 3 simple and conducted at room temperature and atmospheric pressure. Material costs for ARUBA are estimated to be low (~$0.08 per kg) and arsenic remediation with ARUBA has the potential to be affordable to resource-constrained communities. ARUBA is used for removing arsenic via a dispersal-and-removal process, and we envision that ARUBA would be used in community-scale water treatment centers. We show that ARUBA is able to reduce arsenic concentrations in This makes it easy to determine the amount of ARUBA required to treat a groundwater source when its arsenic concentration is known and less than 1600 ppb. Storing contaminated groundwater for two to three days before treatment is seen to significantly increase ARUBA's AAD. ARUBA can be separated from treated water by coagulation and clarification, which is expected to be less expensive than filtration of micron-scale particles, further contributing to the affordability of a community-scale water treatment center.

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“…Arsenic(III) in water samples was separated in the field immediately following filtration with As-speciation cartridges (Metalsoft Center, Highland Park, NJ) (Meng and Wang, 1998;Meng et al, 2002). Samples for anion analysis were left unacidified.…”

Section: Sample Collectionmentioning

confidence: 99%

Role of colloidal particles for hydrogeochemistry in As-affected aquifers of the Hetao Basin, Inner Mongolia

et al. 2009

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High As groundwater was found in shallow aquifers of the Hetao Basin, Inner Mongolia, which has caused serious chronic arsenism. Groundwater particles are ubiquitous in natural aquifers, and significantly affect As mobilization and transportation. This study has investigated their effect on element hydrogeochemistry. Groundwater samples were filtered in the field through a progressively decreasing pore size (10, 5, 3, 1, 0.8, 0.45 µm). Unfiltered samples were also taken. Chemical analysis of 43 groundwater samples shows concentrations of most elements (Ba, Co, Mn, Mo, Ni, V, Sr, Mg, Ca, Na, K) in unfiltered samples are well correlated with those in <0.45 µm fraction, and the ratios between them are close to 1.00. Those elements are considered to be present in the form of true dissolved group and are not affected by the filtration. Although saturation indices for calcite and dolomite are greater than 0, they could possibly exist as small size colloids (<0.45 µm) in groundwater. Concentrations of Cd, Pb, Fe, and Al in <0.45 µm fraction are mostly less than those in unfiltered fraction, implying that large-size inorganic-rich (Al/Fe complexing) colloids could be possible carrier for Cd and Pb in the groundwaters. Arsenic, Cu, Zn and Cr are fallen into another group. These elements could mainly be associated with organic-complexing colloids with particle size less than 0.45 µm, although As could partially be carried by large-size colloids. In groundwaters saturated with respect to pyrite and siderite, a small proportion of As (about 15%) is associated with large-size Fe complexing particles (>0.45 µm). Larger amounts of As is trapped with small size organic colloids, which has been confirmed by the ultrafiltration. The study suggests that groundwater particles transported in the aquifers could affect element geochemistry, especially for As expected to be associated in small size complexes.

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Combined effects of anions on arsenic removal by iron hydroxides

Cited by 345 publications

References 15 publications

The Mazarrón Pb–(Ag)–Zn mining district (SE Spain) as a source of heavy metal contamination in a semiarid realm: Geochemical data from mine wastes, soils, and stream sediments

The Mazarrón Pb–(Ag)–Zn mining district (SE Spain) as a source of heavy metal contamination in a semiarid realm: Geochemical data from mine wastes, soils, and stream sediments

Arsenic remediation of drinking water using iron-oxide coated coal bottom ash

Role of colloidal particles for hydrogeochemistry in As-affected aquifers of the Hetao Basin, Inner Mongolia

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