Dissolved phosphate decreases the stability of amorphous ferric arsenate and nano-crystalline yukonite

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F24%3A10481126" target="_blank" >RIV/00216208:11310/24:10481126 - isvavai.cz</a>

Výsledek na webu

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

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jhazmat.2024.134374" target="_blank" >10.1016/j.jhazmat.2024.134374</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dissolved phosphate decreases the stability of amorphous ferric arsenate and nano-crystalline yukonite

Popis výsledku v původním jazyce

Extensive research has been conducted on the competitive adsorption of arsenate (AsO4(3-)) and phosphate (PO4(3-)) to mineral surfaces, but the stability of ferric arsenate mineral(oid)s under elevated phosphate levels remains poorly understood. Therefore, we investigated the impact of dissolved phosphate (0, 0.5, 50 mM) on the stability of amorphous ferric arsenate (AFA; FeAsO4 &amp; sdot;nH2O) and nano-crystalline yukonite [Ca2Fe3(AsO4)3(OH)4 . 4H2O], both synthetic and contained in natural As-contaminated soil (~16 g/kg As) and mine-waste material (~39 g/kg As) for up to one year. Substantial amounts of As (~45% of total As) were released into solution from AFA and yukonite at high phosphate concentrations due to incongruent dissolution of the solids and substitution of arsenate by phosphate in both mineral(oids). After one year, both solids sequestered ~8 wt% P with approximately 20-30% accounting for adsorbed and precipitated species. This P increase was also observed in the soil and mine-waste samples, where AFA and yukonite comprised up to 4.3 and 4.9 wt% P, respectively. The high reactivity of ferric arsenates with aqueous phosphate may lead to a substantial overestimation of adsorbed As determined by sequential As extractions of materials containing these phases and requires increased caution when applying phosphate to stabilize polymetallic mine wastes. Furthermore, long-term phosphate additions via fertilization of As-contaminated soil or renaturalized mine tailings containing amorphous or nano-crystalline ferric arsenates should be reduced to limit the export of As(V) into surface streams and groundwater.

Název v anglickém jazyce

Dissolved phosphate decreases the stability of amorphous ferric arsenate and nano-crystalline yukonite

Popis výsledku anglicky

Extensive research has been conducted on the competitive adsorption of arsenate (AsO4(3-)) and phosphate (PO4(3-)) to mineral surfaces, but the stability of ferric arsenate mineral(oid)s under elevated phosphate levels remains poorly understood. Therefore, we investigated the impact of dissolved phosphate (0, 0.5, 50 mM) on the stability of amorphous ferric arsenate (AFA; FeAsO4 &amp; sdot;nH2O) and nano-crystalline yukonite [Ca2Fe3(AsO4)3(OH)4 . 4H2O], both synthetic and contained in natural As-contaminated soil (~16 g/kg As) and mine-waste material (~39 g/kg As) for up to one year. Substantial amounts of As (~45% of total As) were released into solution from AFA and yukonite at high phosphate concentrations due to incongruent dissolution of the solids and substitution of arsenate by phosphate in both mineral(oids). After one year, both solids sequestered ~8 wt% P with approximately 20-30% accounting for adsorbed and precipitated species. This P increase was also observed in the soil and mine-waste samples, where AFA and yukonite comprised up to 4.3 and 4.9 wt% P, respectively. The high reactivity of ferric arsenates with aqueous phosphate may lead to a substantial overestimation of adsorbed As determined by sequential As extractions of materials containing these phases and requires increased caution when applying phosphate to stabilize polymetallic mine wastes. Furthermore, long-term phosphate additions via fertilization of As-contaminated soil or renaturalized mine tailings containing amorphous or nano-crystalline ferric arsenates should be reduced to limit the export of As(V) into surface streams and groundwater.

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

2024

Kód důvěrnosti údajů

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

Název periodika

Journal of Hazardous Materials

ISSN

0304-3894

e-ISSN

1873-3336

Svazek periodika

471

Číslo periodika v rámci svazku

June

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

10

Strana od-do

134374

Kód UT WoS článku

001237477200001

EID výsledku v databázi Scopus

2-s2.0-85191479941