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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F14%3A10286036%21RIV15-MSM-11310___
rdf:type
skos:Concept n10:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.aca.2014.06.022
dcterms:description
An optimized sequential extraction (SE) scheme for mine waste materials has been developed and tested for As partitioning over a range of pure As-bearing mineral phases, their model mixtures, and natural mine waste materials. This optimized SE procedure employs five extraction steps: (1) nitrogen-purged deionized water, 10 h; (2) 0.01 M NH4H2PO4,16 h; (3) 0.2 M NH4-oxalatein the dark, pH3, 2 h; (4) 0.2 M NH4-oxalate, pH3/80 degrees C, 4 h; (5) KClO3/HCl/HNO3 digestion. Selectivity and specificity tests on natural mine wastes and major pure As-bearing mineral phases showed that these As fractions appear to be primarily associated with: (1) readily soluble; (2) adsorbed; (3) amorphous and poorly-crystalline arsenates, oxides and hydroxosulfates of Fe; (4) well-crystalline arsenates, oxides, and hydroxosulfates of Fe; as well as (5) sulfides and arsenides. The specificity and selectivity of extractants, and the reproducibility of the optimized SE procedure were further verified by artificial model mineral mixtures and different natural mine waste materials. Partitioning data for extraction steps 3, 4, and 5 showed good agreement with those calculated in the model mineral mixtures (<15% difference), as well as that expected in different natural mine waste materials. The sum of the As recovered in the different extractant pools was not significantly different (89-112%) than the results for acid digestion. This suggests that the optimized SE scheme can reliably be employed for As partitioning in mine waste materials. An optimized sequential extraction (SE) scheme for mine waste materials has been developed and tested for As partitioning over a range of pure As-bearing mineral phases, their model mixtures, and natural mine waste materials. This optimized SE procedure employs five extraction steps: (1) nitrogen-purged deionized water, 10 h; (2) 0.01 M NH4H2PO4,16 h; (3) 0.2 M NH4-oxalatein the dark, pH3, 2 h; (4) 0.2 M NH4-oxalate, pH3/80 degrees C, 4 h; (5) KClO3/HCl/HNO3 digestion. Selectivity and specificity tests on natural mine wastes and major pure As-bearing mineral phases showed that these As fractions appear to be primarily associated with: (1) readily soluble; (2) adsorbed; (3) amorphous and poorly-crystalline arsenates, oxides and hydroxosulfates of Fe; (4) well-crystalline arsenates, oxides, and hydroxosulfates of Fe; as well as (5) sulfides and arsenides. The specificity and selectivity of extractants, and the reproducibility of the optimized SE procedure were further verified by artificial model mineral mixtures and different natural mine waste materials. Partitioning data for extraction steps 3, 4, and 5 showed good agreement with those calculated in the model mineral mixtures (<15% difference), as well as that expected in different natural mine waste materials. The sum of the As recovered in the different extractant pools was not significantly different (89-112%) than the results for acid digestion. This suggests that the optimized SE scheme can reliably be employed for As partitioning in mine waste materials.
dcterms:title
Selectivity assessment of an arsenic sequential extraction procedure for evaluating mobility in mine wastes Selectivity assessment of an arsenic sequential extraction procedure for evaluating mobility in mine wastes
skos:prefLabel
Selectivity assessment of an arsenic sequential extraction procedure for evaluating mobility in mine wastes Selectivity assessment of an arsenic sequential extraction procedure for evaluating mobility in mine wastes
skos:notation
RIV/00216208:11310/14:10286036!RIV15-MSM-11310___
n3:aktivita
n8:S n8:P n8:I
n3:aktivity
I, P(GC13-01706J), S
n3:cisloPeriodika
AUGUST
n3:dodaniDat
n17:2015
n3:domaciTvurceVysledku
n12:1529129 n12:6830471 n12:6620078
n3:druhVysledku
n4:J
n3:duvernostUdaju
n15:S
n3:entitaPredkladatele
n6:predkladatel
n3:idSjednocenehoVysledku
44303
n3:idVysledku
RIV/00216208:11310/14:10286036
n3:jazykVysledku
n5:eng
n3:klicovaSlova
chemical fractionation; mine waste; arsenic; sequential extraction
n3:klicoveSlovo
n14:sequential%20extraction n14:chemical%20fractionation n14:arsenic n14:mine%20waste
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[C1FAB544C10A]
n3:nazevZdroje
Analytica Chimica Acta
n3:obor
n19:DD
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n20:GC13-01706J
n3:rokUplatneniVysledku
n17:2014
n3:svazekPeriodika
839
n3:tvurceVysledku
Kindlová, Helena Drahota, Petr Grösslová, Zuzana
n3:wos
000339992000005
s:issn
0003-2670
s:numberOfPages
10
n18:doi
10.1016/j.aca.2014.06.022
n16:organizacniJednotka
11310