Equilibrium Studies of Polyanions. IV. Silicate Ions in NaCl Medium.

Ingri, Nils; Takki-Luukkainen, I.-T.; Smith-Kielland, I.; Sömme, R.; Stenhagen, Einar; Palmstierna, H.

doi:10.3891/acta.chem.scand.13-0758

Cited by 85 publications

(23 citation statements)

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“…One possible explanation is the presence of dissolved silica from weathering of silicate minerals as described in literature [11][12][13]. The solubility of amorphous silica is known to be 2 × 10 −3 M at pH < 9, dominated by monosilicic acid and increases rapidly with pH via deprotonation and through formation of polysilicic acid [14][15][16]. The different Si species may be involved in various reactions like complexation [17], formation of colloids [18,19] and precipitation [13].…”

Section: Introductionmentioning

confidence: 98%

Immobilization of trivalent actinides by sorption onto quartz and incorporation into siliceous bulk: Investigations by TRLFS

Stumpf

Lützenkirchen

et al. 2008

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 98%

Immobilization of trivalent actinides by sorption onto quartz and incorporation into siliceous bulk: Investigations by TRLFS

Stumpf

Lützenkirchen

et al. 2008

Journal of Colloid and Interface Science

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“…2. When H C of Si 2 (OH) 5 O 2 exchanges with Na C , the peak corresponding to Si 2 (OH) 4 O 3 Na will be observed at m/z 195. Actually, an apparent peak is observed at m/z 195, as shown in Fig.…”

Section: Si 2 (Oh) 5 Omentioning

confidence: 99%

“…For example, the chemical species for a high concentration of silica in KOH solution have been investigated by 29 Si NMR spectroscopy. 4,6 It has been reported that four kinds of monomer silica and seven kinds of silicate complexes exist, such as dimer, cyclic trimer, linear trimer and linear tetramer. 7 Eleven kinds of silicate complexes have been identified in KOH solution in the pH range 10-13.…”

Section: Introductionmentioning

confidence: 99%

“…3 In sodium chloride (NaCl) solution of pH ranging from 10 to 13, silica does not form a polymer complex as easily as in NaClO 4 solution. 4 Generally, orthosilica is considered to exist in the form of a monomer in solution, and as the pH of the solution increases, the more kinds of chemical species could be dissolved.…”

Section: Introductionmentioning

confidence: 99%

“…The silica in the solution is considered to exist in various forms. The basic unit of silica is Si(OH) 4 [ Fig. 1(a Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of silica dissolved in sodium chloride solution using fast atom bombardment mass spectrometry

Tanaka

Takahashi

2000

J. Mass Spectrom.

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The chemical species of silica dissolved in sodium chloride (NaCl) solution were identified by means of fast atom bombardment mass spectrometry (negative ion mode). The concentration of silica in 0.1 M NaCl solution is < 0.6 mmol dm(-3) (mM) and application to the identification of the silicate species at low concentrations such as in natural waters level is also possible. An apparent peak at m/z 95, which corresponds to SiO(OH)(3)(-) in 0.1 M NaCl solution, was not confirmed owing to the interference of the peaks corresponding to NaCl(2)(-); however, peaks for complexes such as Si(OH)(2)O(2)Na(-), Si(2)(OH)(5)O(2)(-), Si(2)(OH)(4)O(3)Na(-), Si(2)(OH)(3)O(4)Na(2)(-), Si(2)(OH)(2)O(5)Na(3)(-), Si(4)(OH)(7)O(5)(-), Si(4)(OH)(6)O(6)Na(-) and Si(4)(OH)(5)O(7)Na(2)(-) were detected. The existence of the trimer and its Na(+) complexes such as Si(3)(OH)(7)O(3)(-), Si(3)(OH)(6)O(4)Na(-) and Si(3)(OH)(5)O(5)Na(2)(-) was not clearly shown. These complexes can be confirmed not only in the form of the anion itself (e.g. Si(2)(OH)(5)O(2)(-)), but also in the form of some complexes with sodium ions, such as Si(2)(OH)(4)O(2)Na(-). Copyright 2000 John Wiley & Sons, Ltd.

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Diffusivity of dissolved silica in rock pore water at 25°C as characterized by through-diffusion experiments

Yokoyama

2013

Water Resour. Res.

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[1] The diffusivity of dissolved Si in rock pore water at 25 C was evaluated by throughdiffusion experiments for three types of rock (Fontainebleau sandstone, Berea sandstone, and Tenjyosan rhyolite). Comparisons of the effective diffusion coefficients of Si, K 1 , and Cl 2 (D e;Si , D e;K 1 , and D e;Cl 2 ) at neutral pH (unbuffered) showed that the D e;Si values obtained for the three rocks were 2.3-3.0 times smaller than those of D e;K 1 and D e;Cl 2 . The small value of D e;Si compared with D e;K 1 and D e;Cl 2 is primarily attributed to the difference in the diffusion coefficients of K 1 , Cl 2 , and Si in free water (a factor of 1.7) but might be also partly due to the precipitation of Si in the pores. The chemical form of the dissolved Si is altered depending on the solution pH. To examine how the diffusivity of Si is affected by its chemical form, the D e;Si values were also determined at pH 6 and pH 11 (buffered solutions containing 0.5 M NaCl) using a Fontainebleau sandstone sample. The dominant chemical forms of Si predicted from thermodynamic calculations are an electrically neutral monomer (Si(OH) 4 ) at pH 6 and an anionic monomer (SiO(OH) 32 ) with a certain amount of anionic multimers (e.g., dimer, trimer, tetramer) at pH 11 (total Si concentration 20.4 mM). The values of D e;Si obtained at pH 6 and pH 11 were quite similar (1.94 3 10 27 to 1.97 3 10 27 cm 2 s 21 ), and D e;Si was hardly affected by the change in the charge state and the presence of multimeric species.

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Equilibrium Studies of Polyanions. IV. Silicate Ions in NaCl Medium.

Cited by 85 publications

References 0 publications

Immobilization of trivalent actinides by sorption onto quartz and incorporation into siliceous bulk: Investigations by TRLFS

Immobilization of trivalent actinides by sorption onto quartz and incorporation into siliceous bulk: Investigations by TRLFS

Characterization of silica dissolved in sodium chloride solution using fast atom bombardment mass spectrometry

Diffusivity of dissolved silica in rock pore water at 25°C as characterized by through-diffusion experiments

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