Nano Precipitates Formed during the Dissolution of Calcite Incorporated with Cu and Mn
Open accessAbstract
Calcite is often doped with impurity ions that affect its dissolution behavior. In the present investigation, solid solutions of (Ca, Mn)CO3 and (Ca, Cu)CO3 were synthesized by coprecipitation to study their dissolution in an acidic solution (pH = 5) at 25 °C. The solution chemical analysis results showed that the concentrations of aqueous Cu2+ and Mn2+ first increased and then decreased with the extension of dissolution time. Scanning electron microscope (SEM) and transmission electron microscope (TEM) observations revealed that rhodochrosite (MnCO3) and malachite (Cu2(OH)2CO3) formed during the dissolution. This suggested that the impurities in calcite might impact the dissolution and precipitation of carbonates in the environment.
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During dissolution of four (Ca1-xMnx)CO3 solids (x = 0-0.12) in acidic solutions, the aqueous Mn2+ concentrations first increased and then decreased with the formation of rhodochrosite (MnCO3).
“During the dissolution of four (Ca1-xMnx)CO3 solids (x = 0–0.12) in acidic solutions, the aqueous Mn2+ concentrations first increased and then decreased with the formation of rhodochrosite (MnCO3)”
From Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C (2021) · cites this paper as [20]
The Abstract reports that aqueous Mn²⁺ first increased and then decreased during acidic dissolution and that rhodochrosite formed; the Release of Metals section gives this trend for Mn-02, Mn-04, and Mn-10. The paper includes a fourth, Mn-free calcite sample, but does not report an aqueous Mn trend for it. Its Coprecipitation Procedures give a highest nominal Mn/Ca ratio of 0.1, not an x value of 0.12. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThe dissolution/precipitation of carbonates might be impacted by impurities in calcite.
“indicating that the dissolution/precipitation of carbonates might be impacted by impurities in calcite [20].”
From Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C (2021) · cites this paper as [20]
The initial dissolution was pH-controlled.
“The notable pH variation showed that the initial dissolution was pH-controlled [20, 32].”
From Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C (2021) · cites this paper as [20]
Manganese more favorably nucleated on crystal surfaces to form new precipitates.
“More calcium was dissolved than manganese, indicating that the (Ca1-xMnx)CO3 solid solutions dissolved nonstoichiometrically [20] and suggesting the existence of an interfacial dissolution–precipitation process; thus, manganese more favorably nucleated on the crystal surfaces to form new precipitates [20, 33].”
From Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C (2021) · cites this paper as [20]
The (Ca1-xMnx)CO3 solid solutions dissolved nonstoichiometrically, releasing Mn and Ca nonstoichiometrically.
“indicating a nonstoichiometric release of Mn and Ca (Additional file 1: Appendix S6 and S8).”
From Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C (2021) · cites this paper as [20]
An interfacial dissolution-precipitation process existed.
“More calcium was dissolved than manganese, indicating that the (Ca1-xMnx)CO3 solid solutions dissolved nonstoichiometrically [20] and suggesting the existence of an interfacial dissolution–precipitation process; thus, manganese more favorably nucleated on the crystal surfaces to form new precipitates [20, 33].”
From Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C (2021) · cites this paper as [20]
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Dissolution and solubility of calcite-rhodochrosite solid solutions [(Ca1-xMnx)CO3] at 25 °C
Zhu, Y., Nong, P., Mo, N., Zhu, Z., Deng, H., Tang, S., Yang, H., Zhang, L., & Wang, X. (2021) · Geochemical Transactions · doi:10.1186/s12932-021-00075-1 · Cited by 11 · see citing works
Zhang, S., Liang, W., Wu, M., Zhong, Q., & Fan, D. (2024) · Physics and Chemistry of Minerals · doi:10.1007/s00269-024-01269-6 · Cited by 3 · see citing works
- Authors
- Zhang, X., Wu, S., & Chen, F.
- Affiliations
- Chinese Academy of Sciences (CN)
- Corresponding author
- Wu, Shijun
- Venue
- Minerals
- Publisher
- MDPI AG
- Published
- 2018-10-25
- Volume
- 8
- Issue
- 11
- Pages
- 484
- ISSN
- 2075-163X (ISSN-L)
- OpenAlex
- W2898289165
- Cited by
- 20
- References
- 1
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 5 · 2023: 2 · 2022: 4 · 2021: 4 · 2020: 1
- FWCI
- 0.63
- Type
- journal article
- Language
- en
- Open access
- gold
- dx.doi.org
- Licence
- Locations
- Minerals (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- National Natural Science Foundation of China (41573098, 41877135)
- Natural Science Foundation of Guangdong Province (2017A030313223)
- Topics
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- calcite dissolution, manganese, impurity ions, solid solutions, co-precipitation, rhodochrosite, malachite, carbonate precipitation, acidic media, carbonate weathering
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