Thermodynamic properties of mansfieldite (AlAsO4.2H2O), angelellite (Fe-4(AsO4)2O3) and kamarizaite (Fe3(AsO4)2(OH)3.3H2O

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F18%3A10134523" target="_blank" >RIV/00023272:_____/18:10134523 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/18:10397321

Výsledek na webu

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/thermodynamic-properties-of-mansfieldite-alaso42h2o-angelellite-fe4aso42o3-and-kamarizaite-fe3aso42oh33h2o/0AC611975D855B843B2798C79ED89BDA" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/thermodynamic-properties-of-mansfieldite-alaso42h2o-angelellite-fe4aso42o3-and-kamarizaite-fe3aso42oh33h2o/0AC611975D855B843B2798C79ED89BDA</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2018.107" target="_blank" >10.1180/mgm.2018.107</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermodynamic properties of mansfieldite (AlAsO4.2H2O), angelellite (Fe-4(AsO4)2O3) and kamarizaite (Fe3(AsO4)2(OH)3.3H2O

Popis výsledku v původním jazyce

Thermodynamic data for the arsenates of various metals are necessary to calculate their solubilities and to evaluate their potential as arsenic storage media. If some of the less common arsenate minerals have been shown to be less soluble than the currently used options for arsenic disposal (especially scorodite and arsenical iron oxides), they should be further investigated as promising storage media. Furthermore, the health risk associated with arsenic minerals is a function of their solubility and bioavailability, not merely their presence. For all these purposes, solubilities of such minerals need to be known. In this work, a complete set of thennodynamic data has been determined for mansfieldite, AlAsO4.2H(2)O; angelellite. Fe4(AsO4)2O3; and kamarizaite, Fe3(AsO4)(OH)3.3H2O, using a combination of high-temperature oxide-melt calorimetry, relaxation calorimetry, solubility measurements, and estimates where possible and appropriate. Available, but limited, chemical data for the natural scorodite-mansfieldite solid-solution series hint at a miscibility gap; hence the non-ideal nature of the series. However, no mixing parameters were derived because more data are needed. The solubility of mansfieldite is several orders of magnitude higher than that of scorodite. The solubility of kamarizaite, on the other hand, is comparable to that of scorodite, and kamarizaite even has a small stability field in a pH-pc diagram. It is predicted to form under mildly acidic conditions in acid drainage systems that are not subject to rapid neutralization and sudden strong supersaturation. The solubility of angelellite is high, and the mineral is obviously restricted to unusual environments, such as fumaroles.

Název v anglickém jazyce

Thermodynamic properties of mansfieldite (AlAsO4.2H2O), angelellite (Fe-4(AsO4)2O3) and kamarizaite (Fe3(AsO4)2(OH)3.3H2O

Popis výsledku anglicky

Thermodynamic data for the arsenates of various metals are necessary to calculate their solubilities and to evaluate their potential as arsenic storage media. If some of the less common arsenate minerals have been shown to be less soluble than the currently used options for arsenic disposal (especially scorodite and arsenical iron oxides), they should be further investigated as promising storage media. Furthermore, the health risk associated with arsenic minerals is a function of their solubility and bioavailability, not merely their presence. For all these purposes, solubilities of such minerals need to be known. In this work, a complete set of thennodynamic data has been determined for mansfieldite, AlAsO4.2H(2)O; angelellite. Fe4(AsO4)2O3; and kamarizaite, Fe3(AsO4)(OH)3.3H2O, using a combination of high-temperature oxide-melt calorimetry, relaxation calorimetry, solubility measurements, and estimates where possible and appropriate. Available, but limited, chemical data for the natural scorodite-mansfieldite solid-solution series hint at a miscibility gap; hence the non-ideal nature of the series. However, no mixing parameters were derived because more data are needed. The solubility of mansfieldite is several orders of magnitude higher than that of scorodite. The solubility of kamarizaite, on the other hand, is comparable to that of scorodite, and kamarizaite even has a small stability field in a pH-pc diagram. It is predicted to form under mildly acidic conditions in acid drainage systems that are not subject to rapid neutralization and sudden strong supersaturation. The solubility of angelellite is high, and the mineral is obviously restricted to unusual environments, such as fumaroles.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

—

Svazek periodika

82

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

22

Strana od-do

1333-1354

Kód UT WoS článku

000456950000009

EID výsledku v databázi Scopus

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