Arsenic release from iron rich mineral processing waste: Influence of pH and redox potential

Al-Abed, Souhail R.; Jegadeesan, Gautham B.; Purandare, Jaydeep; Allen, D.V.

doi:10.1016/j.chemosphere.2006.07.045

Cited by 177 publications

(83 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The study also showed that Fe-bearing minerals strongly affected As release from hydrothermally altered rock. Al-Abed et al [12] and Igarashi et al [13] reported similar observations regarding the pH dependence of As leached from Fe-rich mineral processing waste and various rocks, respectively. The previous papers of the authors [11,13], however, used rock samples containing only As.…”

Section: Introductionsupporting

confidence: 64%

See 1 more Smart Citation

Mechanisms of arsenic and lead release from hydrothermally altered rock

Tabelin

Igarashi

2009

Journal of Hazardous Materials

116

View full text Add to dashboard Cite

This paper describes the effects of pH, dissolved oxygen (DO), redox conditions, and mixing ratio of different rocks on the leaching behaviors of As and Pb from hydrothermally altered rock as well as the functional groups incorporating As and Pb in the rock. Most of As and Pb were incorporated in the residual or crystalline phase although significant amounts were also determined to be exchangeable, with carbonates and with FeMn oxides. Under oxic conditions, As and Pb showed similar leaching behaviors at similar pH values, a higher mobilization in the acidic and alkaline regions and a minimum at circumneutral pH. The absence of DO restricted the oxidation of sulfide minerals that also contained significant quantities of As resulting in a lower As release under these conditions. Strongly reducing conditions favored the release of As by the reductive dissolution of FeMn oxides and prevention of carbonate precipitation while the same conditions immobilized Pb because of its re-precipitation under reducing conditions. In general, depending on the pH, DO, and redox conditions, the major modes of As and Pb release from these sources could be either one or more of the following mechanisms: acid dissolution, reductive dissolution, ion exchange, desorption and sulfide oxidation processes.

show abstract

Section: Introductionsupporting

confidence: 64%

“…[11] and Al-Abeid et al [12] observed a similar behavior of As as a function of pH. Most of the samples containing pyrite had higher amount of As leached in the alkaline region between pH 9 and 12 at ca.…”

Section: Effects Of Ph and Dissolved Oxygen (Do) On As And Pb Leachingsupporting

confidence: 52%

Mechanisms of arsenic and lead release from hydrothermally altered rock

Tabelin

Igarashi

2009

Journal of Hazardous Materials

116

View full text Add to dashboard Cite

show abstract

“…Arsenic is an element that naturally occurring in the environment of high mobility. Its mobility depends on various factors such as the oxidation state, the parent mineral form and mobilization mechanisms [6]. Arsenic can exist in four oxidation forms, these are arsenite (As(III)), arsenate (As(V)), arsenic (As(0)), and arsine (As(III)).…”

Section: Introductionmentioning

confidence: 99%

Characterization of ZrO2 Nano Particles Prepared by Glycothermal Method and their Efficiency as Adsorbent of As(III) and As(V) from Waste Water

Al–Farhan¹

2017

J Environ Anal Toxicol

View full text Add to dashboard Cite

“…Iron deposits, sedimentary iron ores, and manganese nodules are considered As-rich minerals [41]. Important minerals are rich in As, including arsenolite (As 2 O 3 ), olivenite (Cu 2 OHAsO 4 ), cobaltite (CoAsS), proustite (Ag 3 AsS 3 ), enargite (Cu 3 AsS 4 ), orpiment (As 2 S 3 ), realgar (As 4 S 4 ), and tennantite (Cu 6 [Cu 4 (Fe,Zn) 2 ]As 4 S 13 ), and FeAsS is the most abundant As-bearing mineral species found in nature [31,43].…”

Section: Occurrence Of Arsenic In Mineralsmentioning

confidence: 99%

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

et al. 2016

View full text Add to dashboard Cite

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.

show abstract

Arsenic release from iron rich mineral processing waste: Influence of pH and redox potential

Cited by 177 publications

References 30 publications

Mechanisms of arsenic and lead release from hydrothermally altered rock

Mechanisms of arsenic and lead release from hydrothermally altered rock

Characterization of ZrO2 Nano Particles Prepared by Glycothermal Method and their Efficiency as Adsorbent of As(III) and As(V) from Waste Water

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

Contact Info

Product

Resources

About