Speciation and mobility of arsenic and antimony in soils and mining wastes from an abandoned Sb–Au mining area

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10468338" target="_blank" >RIV/00216208:11310/23:10468338 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=_RdaDXkuUZ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=_RdaDXkuUZ</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apgeochem.2023.105665" target="_blank" >10.1016/j.apgeochem.2023.105665</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Speciation and mobility of arsenic and antimony in soils and mining wastes from an abandoned Sb–Au mining area

Popis výsledku v původním jazyce

Gold mining activities have long been recognized as one of the most important local sources of arsenic (As) and antimony (Sb). While the environmental impact of As is documented in the literature from many mining regions worldwide, still little data is available concerning the environmental chemistry and associations of Sb. Here, we used bulk analyses, selective extractions, X-ray diffraction, electron microprobe, and Raman microspectrometry to determine and compare the distribution, speciation, and mobility of As and Sb in three historical mining wastes and two soil profiles at the Krasna Hora-Mile.sov and Pricovy Sb-Au ore districts (Czech Republic). The mining wastes were slightly alkaline, with both high and variable concentrations of As (318-1360 mg/kg) and Sb (214-8740 mg/kg). The naturally developed soils were acidic to neutral and enriched in As (up to 208 mg/kg) as well as in Sb (up to 255 mg/kg), with the highest concentrations in the arable topsoil (&lt;40 cm). In the mining wastes, the primary ore minerals (arsenopyrite, pyrite, and stibnite) have been substantially oxidized and replaced by secondary As and Sb mineral phases such as Fe (hydr)oxides, Ca-Fe-Sb (hydr)oxides, as well as the less common Ca-Sb (hydr)oxides and Ca-Fe arsenates. The primary sulfide minerals were absent in the soils, and both As and Sb were particularly bound to crystalline Fe (hydr)oxides (goethite and hematite) and clay minerals (especially true for Sb). The leaching of As and Sb from all the samples with water was pH-dependent and relatively low, as less than 2.1% of the total As and Sb contents in the samples had been released. Water-extractable concentrations were usually below 30 μg/L for As and 450 μg/L for Sb, except for an alkaline and As- and Sb-rich mining wastes, which released up to 1500 μg/L of As and 5400 μg/L of Sb. Interaction of agricultural soils with low PO4(3-) indicated that As was more likely mobilized by the addition of low PO4(3-) (0.1 mM) than Sb was. Although the water extraction data mostly documented the higher mobility of Sb compared to As, the addition of low PO4(3-) into agricultural soils strongly increases As mobility. Based on the results of this study, leaching of As and Sb from mining wastes by rainwater can contribute to the dispersion of these metalloids and a potential hazard for the surrounding environments.

Název v anglickém jazyce

Speciation and mobility of arsenic and antimony in soils and mining wastes from an abandoned Sb–Au mining area

Popis výsledku anglicky

Gold mining activities have long been recognized as one of the most important local sources of arsenic (As) and antimony (Sb). While the environmental impact of As is documented in the literature from many mining regions worldwide, still little data is available concerning the environmental chemistry and associations of Sb. Here, we used bulk analyses, selective extractions, X-ray diffraction, electron microprobe, and Raman microspectrometry to determine and compare the distribution, speciation, and mobility of As and Sb in three historical mining wastes and two soil profiles at the Krasna Hora-Mile.sov and Pricovy Sb-Au ore districts (Czech Republic). The mining wastes were slightly alkaline, with both high and variable concentrations of As (318-1360 mg/kg) and Sb (214-8740 mg/kg). The naturally developed soils were acidic to neutral and enriched in As (up to 208 mg/kg) as well as in Sb (up to 255 mg/kg), with the highest concentrations in the arable topsoil (&lt;40 cm). In the mining wastes, the primary ore minerals (arsenopyrite, pyrite, and stibnite) have been substantially oxidized and replaced by secondary As and Sb mineral phases such as Fe (hydr)oxides, Ca-Fe-Sb (hydr)oxides, as well as the less common Ca-Sb (hydr)oxides and Ca-Fe arsenates. The primary sulfide minerals were absent in the soils, and both As and Sb were particularly bound to crystalline Fe (hydr)oxides (goethite and hematite) and clay minerals (especially true for Sb). The leaching of As and Sb from all the samples with water was pH-dependent and relatively low, as less than 2.1% of the total As and Sb contents in the samples had been released. Water-extractable concentrations were usually below 30 μg/L for As and 450 μg/L for Sb, except for an alkaline and As- and Sb-rich mining wastes, which released up to 1500 μg/L of As and 5400 μg/L of Sb. Interaction of agricultural soils with low PO4(3-) indicated that As was more likely mobilized by the addition of low PO4(3-) (0.1 mM) than Sb was. Although the water extraction data mostly documented the higher mobility of Sb compared to As, the addition of low PO4(3-) into agricultural soils strongly increases As mobility. Based on the results of this study, leaching of As and Sb from mining wastes by rainwater can contribute to the dispersion of these metalloids and a potential hazard for the surrounding environments.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA22-27939S" target="_blank" >GA22-27939S: Vliv půdní geochemie a mineralogie na mobilitu a biodosažitelnost arzenu v půdách s různým obsahem fosforečnanu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Geochemistry

ISSN

0883-2927

e-ISSN

1872-9134

Svazek periodika

152

Číslo periodika v rámci svazku

May

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

105665

Kód UT WoS článku

000985883200001

EID výsledku v databázi Scopus

2-s2.0-85152591578