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Influence of soil physicochemical properties,particle size fractions and mineralogy on the leaching potentials of arsenic and antimony in abandoned mine soils

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Pedosphere 2023年第5期33卷 744-753页

作者： A.S.M.Fazle BARI Dane LAMB Geoff R.MACFARLANE Mohammad Mahmudur RAHMAN Global Centre for Environmental Remediation(GCER) College of EngineeringScience and EnvironmentThe University of NewcastleCallaghanNSW 2308Australia Department of Soil Science Sher-e-Bangla Agricultural UniversityDhaka 1207Bangladesh Chemical and Environmental Engineering School of EngineeringRMIT UniversityMelbourneVictoria 3000Australia School of Environmental and Life Sciences The University of NewcastleCallaghanNSW 2308Australia

At abandoned mine sites,arsenic(As)-and antimony(Sb)-enriched soils are often disposed of through onsite burial or *** highly weathered mine sites,the mobility of As and Sb is typically controlled by iron(Fe)(III)/Fe(II)phases;thus,the suitability of such disposal methods and appropriate testing techniques are *** the present study,leaching potentials of As and Sb were examined using the toxicity characteristic leaching procedure(TCLP),waste extraction test(WET),and WET-extended procedure(WET-EXT)at three abandoned mine site soils in *** leached concentration of As regularly exceeded USEPA criteria(5 mg L^(-1)).The highest leached concentrations of As and Sb were observed in the finest particle size fraction(extraction data clearly indicate the dominant role of Fe geochemistry in controlling leachability of As and *** TCLP method was unlikely to be suitable for assessing leachability,as it exhibited no relationship with leachable Fe and substantially lower leached As and Sb than the other two *** the high to extremely high leachable As and Sb concentrations,most of the soil samples would not be recommended for placement in capping works,old shafts,or reduction systems(e.g.,collection in drainage basins).

关键词： particle size fraction sequential extraction toxic element toxicity characteristic leaching procedure waste extraction test

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