Differential dissolution technique for the geochemical separation of the calcite and dolomite of dolomitic limestones

Toyama, Kotaro; Terakado, Yasutaka

doi:10.2343/geochemj.2.0378

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…We observed a remarkable decrease in pH values when B. thuringiensis NL-11 was incubated with dolostones, suggesting that B. thuringiensis NL-11 produced organic acids to enhance carbonate mineral dissolution and ion release. In the present study, acetic acid was found to be an effective material for mineral dissolution, which is consistent with the findings of previous studies (Toyama & Terakado, 2015).…”

Section: Mineral-weathering Potential Of Strain Nl-11supporting

confidence: 93%

An Indigenous Soil Bacterium Facilitates the Mitigation of Rocky Desertification in Carbonate Mining Areas

Zhang

Guo

2017

Land Degrad Dev

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Carbonate minerals are extensively distributed across China, and their special rock structures make them vulnerable to land damage through mining, leading to rocky desertification. Soil microorganisms play an important role in mineral weathering. However, little is known about the utilization of the mineral‐weathering microorganisms to alleviate the problem of rocky desertification in mines. In the present study, the mineral‐solubilizing bacterium NL‐11 was isolated from soil around weathered dolostones and identified as Bacillus thuringiensis based on the Biolog identification system and 16S rDNA sequence analysis. The mineral dissolution experiments revealed that inoculation with the live bacterium significantly increased the mineral sample dissolution via significantly enhancing Ca and Mg release, with increase values of 303·27 and 50·55 mg L−1 respectively, compared with that with the inactivated bacterium. Moreover, the acetic acid secreted by strain NL‐11 markedly decreased the size of particle diameter (quantified with a laser diffraction particle size analyser) through reducing pH value. The eroded traces were observed by scanning electron microscopy analysis, and the results further verified the erosional effects of this strain. In addition, this bacterium contributed to the establishment and proliferation of plants by providing nutrient elements, such as phosphorus (P) and potassium (K). Our study not only provided an efficient bacterial strain NL‐11 but also enriched the technologies to mitigate problems associated with ecological restorations of carbonate mines. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Mineral-weathering Potential Of Strain Nl-11supporting

confidence: 93%

An Indigenous Soil Bacterium Facilitates the Mitigation of Rocky Desertification in Carbonate Mining Areas

Zhang

Guo

2017

Land Degrad Dev

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“…Hyphae interspersed and penetrated the rock surface via cracks and other weak positions, intruded into the interior, produced mechanical damage, loosened the rock structure, increased the contact area, and formed a hyphaemineral aggregate, making the granite surface rough. This result was previously noted by Lian (2014),Peng et al (2015), andToyama and Terakado (2015).…”

supporting

confidence: 88%

“…Our results show that the most important factor influencing the weathering of A. niger was pH (x2), followed by vaccination quantity (x4), temperature (x1), and the influence of generation cycle (x3). It is clear that acidolysis is one important way to promote the microbial weathering of minerals (Wu et al, 2018;Welch and Ullman, 1993;Toyama and Terakado, 2015), and comprises both inorganic and organic acids (Lian, 2008). Data show that given the same pH conditions, organic acids are more likely to accelerate the dissolution of minerals than their inorganic counterparts because the former can combine proton exchange with ligand complexes in weathering to form a complex enhancing rock dissolution (Štyriaková et al, 2012).…”

Section: The Relationship Between Environmental Factors and A Niger Granite Weatheringmentioning

confidence: 99%

The Influence of Environmental Factors on Aspergillus Niger Granite Weathering

Wu¹,

Hu²

2019

Appl. Ecol. Env. Res.

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In order to explore the effects and influence of environmental factors on microbial restoration of waste rock, an efficient rock-weathering strain Aspergillus niger XF-1 was isolated from a granite face. Concentrations of SiO2 in nutrient solution at different temperatures, pH values, generation cycles, and vaccination quantities were measured using shake flask leaching and inductively coupled plasma optical emission spectrometer (ICP-OES) to analyze the grey correlation degree of weathering. The results reveal that the A. niger XF-1 strain can be used as a good fungal source for the restoration of degraded habitats in abandoned granite areas, and can also be used to promote the release of more Si elements in granite. Moreover, pH is the dominant factor affecting the weathering of granite by A. niger, followed by vaccination quantity and temperature, while generation cycle is the least important factor. The optimum temperature at which granite is weathered by A. niger was 28°C, the most appropriate pH value was 3, the most suitable generation was the fifth, and the optimum vaccination quantity was 10 7 (spore numbers mL -1 ).

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“…Therefore, the main contribution types of carbonate minerals can be distinguished by the comparison of Mg 2+ and Ca 2+ . If the ratio of Mg 2+ /Ca 2+ > 0.50, the weathering process may be controlled by dolomite dissolution; otherwise, it is controlled by calcite dissolution . Most of the Mg 2+ /Ca 2+ values in the Nanming River are less than 0.50, and the highest value is 0.64, suggesting that the riverine solute is mainly controlled by the secondary calcite precipitation.…”

Section: Resultsmentioning

confidence: 99%

Riverine Hydrochemical Characteristics of a Typical Karst Urban Watershed: Major Ion Compositions, Sources, Assessment, and Historical Evolution

Han

2022

ACS Earth Space Chem.

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Urban watersheds suffer from great pressure concerning poor water carrying capacity in the karst area with a fragile ecology system and urbanization disturbance. The hydrochemistry of karst urban rivers plays a vital role in the maintenance of water ecology. This study determined the sources of major ions (Na + , K + , Mg 2+ , Ca 2+ , F − , Cl − , NO 3 − , SO 4 2− , and HCO 3 − ) in the Nanming urban watershed. The ion concentrations were dominated by the HCO 3 − -Ca 2+ •Mg 2+ type and complied with the compoment characteristics of major ions in karst rivers with the order of Ca 2+ (mean: 83.1 mg/L) > Mg 2+ (mean: 17.6 mg/L) > Na 2+ (mean: 15.2 mg/L) > K + (mean: 6.7 mg/ L) and HCO 3 − (mean: 252.7 mg/L) > SO 4 2− (mean: 101.5 mg/L) > Cl − (mean: 17.8 mg/L) > NO 3 − (mean: 17.7 mg/L). The chemical composition of the Nanming River was possibly affected by carbonate weathering (Ca 2+ , Mg 2+ , and HCO 3 − ) and anthropogenic inputs (SO 4 2− , NO 3 − , Cl − , Na + , and K + ) through methods of principal component analysis (PCA) and ion ratios. The irrigation water quality and health risk were evaluated by the calculation of sodium adsorption ratio (SAR), soluble sodium percentage (Na%), residual sodium carbonate (RSC), and hazard quotient (HQ) and the comparison of corresponding guidelines. The results showed that the Nanming River was marginally suitable for agricultural irrigation but dangerous for direct drinking intake, and the noncarcinogenic health risk of riverine ions should also be of concern. The control of urban wastewater discharge should be paid more attention to improve the water quality in such an urban watershed.

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Differential dissolution technique for the geochemical separation of the calcite and dolomite of dolomitic limestones

Cited by 11 publications

References 9 publications

An Indigenous Soil Bacterium Facilitates the Mitigation of Rocky Desertification in Carbonate Mining Areas

An Indigenous Soil Bacterium Facilitates the Mitigation of Rocky Desertification in Carbonate Mining Areas

The Influence of Environmental Factors on Aspergillus Niger Granite Weathering

Riverine Hydrochemical Characteristics of a Typical Karst Urban Watershed: Major Ion Compositions, Sources, Assessment, and Historical Evolution

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