Determination of phosphorus in zircons by inductively coupled plasma atomic emission spectrometry

Fariñas, Juan C.

doi:10.1021/ac00199a003

Cited by 7 publications

(1 citation statement)

References 27 publications

(22 reference statements)

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“…Further details on the recalcification procedure can be found elsewhere [57]. For most determinations of Ca/Si ratio, the solid was decomposed with LiBO 3 at 1000 ºC to form a glass soluble in weakly acidic solution, which was then analyzed for Ca and Si by ICP-AES [59]. In the several cases where the Ca/Si ratio was not directly determined, values were calculated from differences in the initial and final concentrations of Ca and Si in solution; measured and calculated values of Ca/Si ratio generally agreed to within 2%.…”

Section: Solubility Measurementsmentioning

confidence: 99%

Solubility and structure of calcium silicate hydrate

Chen

Thomas

Taylor³

et al. 2004

Cement and Concrete Research

725

414

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C-S-H, the poorly crystalline calcium silicate hydrate formed in cement paste and aqueous suspension, is characterized by extensive disorder and structural variations at the nanometer scale. An analysis of new and published solubility data for C-S-H formed by different preparation methods and with a broad range of compositions illustrates a previously unrecognized family of solubility curves in the CaO-SiO 2 -H 2 O system at room temperature. As demonstrated by 29 Si magic-angle spinning (MAS) NMR data and by charge balance calculations, the observed differences in solubility arise from systematic variations in Ca/Si ratio, silicate structure, and Ca-OH content. Based on this evidence, the family of solubility curves are interpreted to represent a spectrum of metastable C-S-H phases whose structures range from purely tobermorite-like to largely jennite-like. These findings give an improved understanding of the structure of these phases and reconcile some of the discrepancies in the literature regarding the structure of C-S-H at high Ca/Si ratios.

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Section: Solubility Measurementsmentioning

confidence: 99%