The combined effect of pH and temperature on smectite dissolution rate under acidic conditions

Amram, Keren; Ganor, Jiwchar

doi:10.1016/j.gca.2004.10.001

Cited by 124 publications

(68 citation statements)

References 32 publications

(87 reference statements)

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“…This suggests that illite and potentially other clay minerals may be an important component of the "slow" Fe pool. This agrees with the results that clay minerals like smectite, illite and kaolinite dissolve at low pH conditions although at a slow rate, i.e., <1 × 10 −12 mol m −2 s −1 (Ganor et al, 1995;Köhler et al, 2003;Amram and Ganor, 2005). On the other hand, at pH 1 and 60 mg L −1 , Fe dissolved from the Beijing dust sample did not reach the value predicted for hematite equilibrium Fe solubility (Fig.…”

Section: Link Between Fe Mineralogy and The Three Fe Poolssupporting

confidence: 90%

Iron dissolution kinetics of mineral dust at low pH during simulated atmospheric processing

et al. 2011

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Section: Link Between Fe Mineralogy and The Three Fe Poolssupporting

confidence: 90%

Iron dissolution kinetics of mineral dust at low pH during simulated atmospheric processing

et al. 2011

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“…7 and A6). A similar effect of pH was observed in earlier dissolution studies on pure phase and soil clay minerals (Amram and Ganor, 2005;Bibi et al, 2011c;Cama et al, 2002;Khawmee et al, 2013;Rozalen et al, 2009b).…”

Section: Effect Of Ph and Ionic Strength On Clay Dissolution Ratesupporting

confidence: 83%

“…The indirect effect of pH on dissolution rate is through its effect on the degree of saturation of the solution which in this case was determined by calculating the value of DG r . The effect of degree of saturation on dissolution rate is minimized by conducting experiments under 'far from equilibrium' conditions (Amram and Ganor, 2005).…”

Section: Effect Of Ph and Ionic Strength On Clay Dissolution Ratementioning

confidence: 99%

“…The reaction of saline-acidic solutions with phyllosilicates is therefore of considerable interest in understanding the acid neutralisation process in inland acid sulfate soils (IASS). Considerable efforts have been devoted to study the dissolution mechanisms of individual phyllosilicates under laboratory conditions (Amram and Ganor, 2005;Bibi et al, 2011c;Brandt et al, 2003;Cama and Ganor, 2006;Cama et al, 2002;Golubev et al, 2006;Kalinowski and Schweda, 2007;Kohler et al, 2003;Lawson et al, 2007;Metz et al, 2005b;Oelkers et al, 2008;Yang and Steefel, 2008;Zysset and Schindler, 1996). Only limited research has been done on the acid dissolution of natural clay samples or phyllosilicates isolated from soils (Jurjovec et al, 2002;Salmon and Malmstrom, 2006;Shaw and Hendry, 2009), particularly with a focus on comparing the neutralisation potential of different mineral groups such as carbonates, oxide minerals and phyllosilicates.…”

Section: Introductionmentioning

confidence: 99%

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Dissolution kinetics of soil clays in sulfuric acid solutions: Ionic strength and temperature effects

Bibi

Singh

Silvester

2014

Applied Geochemistry

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“…1). The steady state dissolution rates for smectite is inversely proportional to solvent pH (Amram and Ganor 2005;Golubev et al 2006). Hence, increased smectite dissolution at lower pH values could yield more silica dissolution, thereby exposing more beryllium for dissolution.…”

Section: Discussionmentioning

confidence: 99%

Release of beryllium from mineral ores in artificial lung and skin surface fluids

Duling

Stefaniak

Lawrence

et al. 2011

Environ Geochem Health

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Exposure to some manufactured beryllium compounds via skin contact or inhalation can cause sensitization. A portion of sensitized persons who inhale beryllium may develop chronic beryllium disease (CBD). Little is understood about exposures to naturally occurring beryllium minerals. The purpose of this study was to assess the bioaccessibility of beryllium from bertrandite ore. Dissolution of bertrandite from two mine pits (Monitor and Blue Chalk) was evaluated for both the dermal and inhalation exposure pathways by determining bioaccessibility in artificial sweat (pH 5.3 and pH 6.5), airway lining fluid (SUF, pH 7.3), and alveolar macrophage phagolysosomal fluid (PSF, pH 4.5). Significantly more beryllium was released from Monitor pit ore than Blue Chalk pit ore in artificial sweat buffered to pH 5.3 (0.88 ± 0.01% vs. 0.36 ± 0.00%) and pH 6.5 (0.09 ± 0.00% vs. 0.03 ± 0.01%). Rates of beryllium released from the ores in artificial sweat were faster than previously measured for manufactured forms of beryllium (e.g., beryllium oxide), known to induce sensitization in mice. In SUF, levels of beryllium were below the analytical limit of detection. In PSF, beryllium dissolution was biphasic (initial rapid diffusion followed by latter slower surface reactions). During the latter phase, dissolution half-times were 1,400 to 2,000 days, and rate constants were ~7 × 10(-10) g/(cm(2)·day), indicating that bertrandite is persistent in the lung. These data indicate that it is prudent to control skin and inhalation exposures to bertrandite dusts.

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The combined effect of pH and temperature on smectite dissolution rate under acidic conditions

Cited by 124 publications

References 32 publications

Iron dissolution kinetics of mineral dust at low pH during simulated atmospheric processing

Iron dissolution kinetics of mineral dust at low pH during simulated atmospheric processing

Dissolution kinetics of soil clays in sulfuric acid solutions: Ionic strength and temperature effects

Release of beryllium from mineral ores in artificial lung and skin surface fluids

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