pHstatvs. single extraction tests to evaluate heavy metals and arsenic leachability in environmental samples

Rigol, Anna; Mateu, Javier; González-Núñez, R.; Rauret, G.; Vidal, Miquel

doi:10.1016/j.aca.2008.10.066

Cited by 36 publications

(26 citation statements)

References 22 publications

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“…For instance, a distinctive pattern in the mineral samples with soluble contamination was detected with respect to the samples from the accidental spill of pyritic sludge. The increase in the As leaching rate at acid pH in the latter samples is attributed to the solubilization of the sludge itself and related minerals (e.g.,As-jarosite), rather than to the variation of the surface charge as a function of pH [16][17][18][19][20][21][22][23]. The above study suggests lime amendment to be used with caution.…”

Section: Introductionmentioning

confidence: 97%

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Moghal

Reddy²,

Mohammed³

et al. 2017

geomate

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ABSTRACT:In this study, locally available semi-arid soils (Al-Ghat and Al-Qatif) having different chemical and mineralogical characteristics are considered as barrier materials, and their response to arsenic adsorption at varying initial concentrations, pH conditions, temperature and dilution ratios is studied. Empirical models (Langmuir and Freundlich) are applied to ascertain monolayer or heterogeneous adsorption. Lime is added to these soils in order to enhance their geotechnical properties. Kinetic models are employed to validate the type and nature of arsenic sorption onto these soils (whether pseudo first-order or second-order). Also Elovich and intraparticle diffusion models revealed that along with surface adsorption, chemisorptions and diffusion are the other processes occurring concurrently in the system, but it was not able to identify the dominant phenomenon among these models. It was concluded that both Al-Ghat and Al-Qatif soils when amended with lime can attenuate arsenic, and the experimental results correlate well with selected empirical models.

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Section: Introductionmentioning

confidence: 97%

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Moghal

Reddy²,

Mohammed³

et al. 2017

geomate

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“…Only the content of Cu was higher than As in the top soils compared with collection and transportation sites, it may be due to the lower pH and As existing as anion [37]. The mobility of Cu was powerful than As under low pH in soil of the tailing ore [38]. The pH of soil in this site was lowest, because sulfide minerals were oxidated and formed acids in soils.…”

Section: Resultsmentioning

confidence: 99%

Distribution of Heavy Metals, Chemical Fractions and Ecological Risks around a Molybdenum Mine in Liaoning Province, China

Qu¹,

Yuan²,

Wang³

et al. 2012

VTE

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The total contents of lead, arsenic, mercury, chromium, cadmium, zinc, copper, molybdenum and nickel were determined in soils collected from mining and agricultural areas around the molybdenum mine in Liaoning Province, China. The distribution, chemical fractions and ecological risks of heavy metals in soils were investigated and assessed. It was found that: the degrees of warning for all soils, both mining industry areas and agricultural areas, were serious warning. The results meant that all soils were contaminated seriously by heavy metals. The observed scheme of chemical fractions for heavy metals in soils of different sites was as follows commonly: residual>oxidable> reducible>acid soluble. The sources of heavy metals in top soils around the mine were as follows: dust fall, residue in the open air, higher background in soil-forming process, accompaniment element, automobile exhaust, wear of tires and brakes, release of heavy metals from ore tailing, the application of pesticides and irrigation with wastewater.

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“…Mg values ranged from 28.74 to 357.8 mg/l. The leaching of Ca and Mg can be assumed to be controlled by the dissolution of Ca and Mg-bearing silicates and gypsum (Rigol et al 2009;Silva et al 2011a). Iron concentrations of AMLs ranged between 7.7 and 329.7 mg/l.…”

Section: Hydrogeochemistry Of Amlsmentioning

confidence: 99%

Generation of Acid Mine Lakes Associated with Abandoned Coal Mines in Northwest Turkey

Yücel

Balcı

Baba

2016

Arch Environ Contam Toxicol

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A total of five acid mine lakes (AMLs) located in northwest Turkey were investigated using combined isotope, molecular, and geochemical techniques to identify geochemical processes controlling and promoting acid formation. All of the investigated lakes showed typical characteristics of an AML with low pH (2.59-3.79) and high electrical conductivity values (1040-6430 lS/cm), in addition to high sulfate (594-5370 mg/l) and metal (aluminum [Al], iron [Fe], manganese [Mn], nickel [Ni], and zinc [Zn]) concentrations. Geochemical and isotope results showed that the acid-generation mechanism and source of sulfate in the lakes can change and depends on the age of the lakes. In the relatively older lakes (AMLs 1 through 3), biogeochemical Fe cycles seem to be the dominant process controlling metal concentration and pH of the water unlike in the younger lakes (AMLs 4 and 5). Bacterial species determined in an older lake (AML 2) indicate that biological oxidation and reduction of Fe and S are the dominant processes in the lakes. Furthermore, O and S isotopes of sulfate indicate that sulfate in the older mine lakes may be a product of much more complex oxidation/dissolution reactions. However, the major source of sulfate in the younger mine lakes is in situ pyrite oxidation catalyzed by Fe(III) produced by way of oxidation of Fe(II). Consistent with this, insignificant fractionation between d 34 S SO 4 and d 34 S FeS 2 values indicated that the oxidation of pyrite, along with dissolution and precipitation reactions of Fe(III) minerals, is the main reason for acid formation in the region. Overall, the results showed that acid generation during early stage formation of an AML associated with pyrite-rich mine waste is primarily controlled by the oxidation of pyrite with Fe cycles becoming the dominant processes regulating pH and metal cycles in the later stages of mine lake development.Acidic and highly metal-loaded effluents (acid mine drainage [AMD]) resulting from the exposure of pyrite and other metal sulfide minerals to weathering conditions are the principal environmental problems faced by the mining industry today (Dold and Spangerberg 2005).The formation mechanisms of AMD (e.g., oxidation of pyrite and other sulfide minerals) has been extensively studied

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pHstatvs. single extraction tests to evaluate heavy metals and arsenic leachability in environmental samples

Cited by 36 publications

References 22 publications

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Retention Studies on Arsenic From Aqueous Solutions by Lime Treated Semi Arid Soils

Distribution of Heavy Metals, Chemical Fractions and Ecological Risks around a Molybdenum Mine in Liaoning Province, China

Generation of Acid Mine Lakes Associated with Abandoned Coal Mines in Northwest Turkey

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