Synthesis of protodolomite from sea water containing dioxane
Open accessAbstract
Protodolomite was synthesized from sea water containing dioxane by adding 0.4M Na2CO3 solution at 40°C. The presence of dioxane in moderate concentrations (3 to 8vol%) in a parent solution favors the formation of CaCO3(calcite)-MgCO3 solid solution. Optimal condition for protodolomite synthesis was established. The mineral synthesized from sea water containing dioxane was very superior in size and crystallinity as compared to that from highly saline but dioxane-free solutions.
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Many successful attempts at low-temperature disordered dolomite precipitation have been demonstrated with the presence of catalysts.
“Many successful attempts at low-temperature disordered dolomite precipitation have been demonstrated in the past years with the presence of catalysts.33−38”
From Low-Temperature Synthesis of Disordered Dolomite and High-Magnesium Calcite in Ethanol–Water Solutions: The Solvation Effect and Implications (2022) · cites this paper as [33]
The experimental procedures report synthesis at 40°C, and the section on dioxane's effect reports that mineralogically pure protodolomite formed in seawater containing 5 vol% dioxane. This supports one successful low-temperature precipitation attempt. The paper describes dioxane as a solvent additive, not a catalyst, and does not establish that the product was disordered. (LLM, conf=0.85)
Experimental — accuracy not yet measuredPrevious experiments demonstrated that catalysts such as dioxane, carboxylated polystyrene, dissolved silica, ethanol, hydrogen sulfide, polysaccharide, and EPS could promote the Mg-water complex to dehydrate at ambient conditions and allow Mg to incorporate into the calcite structure.
“Previous experiments demonstrated that catalysts such as dioxane,56 carboxylated polystyrene,57 dissolved silica,18 ethanol,16 hydrogen sulfide,19 polysaccharide,20 and exopolymeric substances (EPS; 21) could promote the Mg–water complex to dehydrate at ambient conditions and allow for Mg to incorporate into the calcite structure.”
From Organic Controls over Biomineral Ca-Mg Carbonate Compositions and Morphologies (2023) · cites this paper as [57]
Split into 2 atoms — 0 confirmed, 2 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredWater activity and desolvation energy of cations can be reduced by adding a component with a low dielectric constant.
“It has been well-known that both water activity and desolvation energy of cations can be reduced by adding a component with a lowdielectric constant (Oomori and Kitano, 1987;Zhang et al., 2012a, b).”
From Catalytic effect of microbially-derived carboxylic acids on the precipitation of Mg-calcite and disordered dolomite: Implications for sedimentary dolomite formation (2020) · cites this paper as Oomori and Kitano, 1987
The Introduction (p. 59) says that adding low-dielectric dioxane to seawater can lower water activity. The section on dioxane’s effect on precipitates says it modifies ion hydration, but does not state that it reduces cation desolvation energy; that part of the claim is not established by our copy. (LLM, conf=0.84)
Experimental — accuracy not yet measuredSeveral studies show enhancement of Mg levels in growing Mg-calcite or disordered dolomite by organic additives that exhibit low Mg-binding affinity, such as methanol, alcohol, propanol, dioxane, methane, acetate and agar.
“Furthermore, there have been several studies showing the enhancement of Mg levels in growing Mgcalcite or disordered dolomite by some organic additives that exhibit a low Mg-binding affinity, such as methanol, alcohol, propanol, dioxane, methane, acetate and agar (Oomori and Kitano, 1987;Falini et al., 1996;Xu et al., 2010;Zhang et al., 2010;Zhang et al., 2012a).”
From Catalytic effect of microbially-derived carboxylic acids on the precipitation of Mg-calcite and disordered dolomite: Implications for sedimentary dolomite formation (2020) · cites this paper as Oomori and Kitano, 1987
The ‘Effect of dioxane on the mineralogy of precipitates’ section reports that dioxane favors formation of Mg-bearing calcite–MgCO3 solid solutions and forms no stable complexes with magnesium ions. But it also reports that MgCO3 content decreases as dioxane concentration rises, so this paper does not support an unqualified claim that dioxane enhances Mg levels in the growing solids. The other listed additives are not findings attributed specifically to this paper. (LLM, conf=0.88)
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- Authors
- Oomori, T., & Kitano, Y.
- Affiliations
- University of the Ryukyus (JP)
- Nagoya University (JP)
- Venue
- GEOCHEMICAL JOURNAL
- Publisher
- Geochemical Society of Japan
- Published
- 1987
- Volume
- 21
- Issue
- 2
- Pages
- 59-65
- ISSN
- 0016-7002 (ISSN-L)
- OpenAlex
- W2095537174
- Semantic Scholar
- d431684a32202842c5fe49df55cd76b8057ff8a2
- Cited by
- 38
- References
- 19
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 1 · 2023: 4 · 2022: 2 · 2021: 4 · 2020: 5 · 2019: 2 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 1 · 2014: 1 · 2013: 1 · 2012: 4
- FWCI
- 1.16
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Locations
- GEOCHEMICAL JOURNAL (publishedVersion)
- Topics
- Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
- Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Keywords
- protodolomite, seawater, 1,4-dioxane, calcium carbonate, magnesium carbonate, sodium carbonate, crystallinity, saline solution
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