Equilibrium Studies of Polyanions. III. Silicate Ions in NaClO4 Medium.

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

doi:10.3891/acta.chem.scand.13-0722

Cited by 102 publications

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“…However, the peaks of NaCl 2 (m/z 93, 95 and 97) interfered with the peak for Si(OH) 3 O at m/z 95, hence the existence of Si(OH) 3 O could not be confirmed.…”

Section: Mass Spectra Of Silica Dissolved In Nacl At Equilibriummentioning

confidence: 92%

“…In 0.1 M NaCl solution, the mass spectra of the apparent peak of Si(OH) 3 O at m/z 95 could not be confirmed.…”

Section: Si(oh) 3 Omentioning

confidence: 99%

“…If Si(OH) 3 O exists stably in the sample solution, the peak for Si(OH) 3 O will be observed at mass number 95. However, the peaks of NaCl 2 (m/z 93, 95 and 97) interfered with the peak for Si(OH) 3 O at m/z 95, hence the existence of Si(OH) 3 O could not be confirmed.…”

Section: Mass Spectra Of Silica Dissolved In Nacl At Equilibriummentioning

confidence: 99%

“…When H C of Si(OH) 3 O exchanges with Na C , the Si(OH) 2 O 2 Na complex will be formed in 0.1 M NaCl solution. As shown in Fig.…”

Section: Si(oh) 3 Omentioning

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%

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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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“…However, the peaks of NaCl 2 (m/z 93, 95 and 97) interfered with the peak for Si(OH) 3 O at m/z 95, hence the existence of Si(OH) 3 O could not be confirmed.…”

Section: Mass Spectra Of Silica Dissolved In Nacl At Equilibriummentioning

confidence: 92%

“…In 0.1 M NaCl solution, the mass spectra of the apparent peak of Si(OH) 3 O at m/z 95 could not be confirmed.…”

Section: Si(oh) 3 Omentioning

confidence: 99%

Section: Mass Spectra Of Silica Dissolved In Nacl At Equilibriummentioning

confidence: 99%

“…When H C of Si(OH) 3 O exchanges with Na C , the Si(OH) 2 O 2 Na complex will be formed in 0.1 M NaCl solution. As shown in Fig.…”

Section: Si(oh) 3 Omentioning

confidence: 99%

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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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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