Near-infrared spectroscopic determination of water species in glasses of the system MAlSi3O8 (M = Li, Na, K) : an interlaboratory study

Behrens, Harald; Romano, Claudia; Nowak, Marcus; Holtz, François; Dingwell, Donald B.

doi:10.1016/0009-2541(95)00162-x

Cited by 194 publications

(99 citation statements)

References 32 publications

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“…Typically, for a measurement time of 12 min and a sample mass of 10 mg, the maximum uncertainty (one sigma) is of ±0.15% relative (Behrens et al 1996). Thus, the analytical error reported for samples for which only one analysis is available is taken to be 0.15% relative.…”

Section: Kft Resultsmentioning

confidence: 99%

“…Reproducible analyses were obtained for samples yielding about 200-500 μg of H 2 O, which required between 4 and 20 mg of glass, depending on its H 2 O content. Following previous works, we assumed that the residual water within the samples after KFT analyses is about 0.10 ± 0.05 wt% (Behrens et al 1996). For each experimental run product, up to three measurements were done whenever enough material was available.…”

Section: Analytical Techniquesmentioning

confidence: 99%

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The H2O solubility of alkali basaltic melts: an experimental study

Lesne

Scaillet

Pichavant

et al. 2010

Contrib Mineral Petrol

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The H2O solubility of alkali basaltic melts: an experimental study. Contributions to Mineralogy and Petrology, Springer Verlag, 2011, 162 (1) Our results show that at pressures above 1 kbar, alkali basalts dissolve more water than typical mid-ocean ridge basalts (MORB). Combination of our data with those from previous studies allows the following simple empirical model for the water solubility of basalts of varying alkalinity and fO 2 to be derived:where H 2 O MORB is the water solubility at the calculated P, using the model of Dixon et al. (1995). This equation reproduces the existing database on water solubilities in basaltic melts to within 5%. Interpretation of the speciation data in the context of the glass transition theory shows that water speciation in basalt melts is severely modified during quench. At magmatic temperatures, more than 90% of dissolved water forms hydroxyl groups at all water contents, whilst in natural or synthetic glasses, the amount of molecular water is much larger. A regular solution model with an explicit temperature dependence reproduces well-observed water species. Derivation of the partial molar volume of molecular water using standard thermodynamic considerations yields values close to previous findings if room temperature water species are used. When high temperature species proportions are used, a negative partial molar volume is obtained for molecular water. Calculation of the partial molar volume of total water using H 2 O solubility data on basaltic melts at pressures above 1 kbar yields a value of 19 cm 3 /mol in reasonable agreement with estimates obtained from density measurements.

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Section: Kft Resultsmentioning

confidence: 99%

Section: Analytical Techniquesmentioning

confidence: 99%

The H2O solubility of alkali basaltic melts: an experimental study

Lesne

Scaillet

Pichavant

et al. 2010

Contrib Mineral Petrol

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“…To check that water did not leak from the capsules, the capsules were weighed before and after being placed in an oven for at least one hour and no weight difference was observed. Homogeneity and absolute water content of the hydrated samples were determined by Karl-Fischer Titration (Hannover University), following the method described by Behrens et al (1996) and Nowak and Behrens (1997). To correct for unextracted water after KFT, a quantity of 0.10 wt% was added to the measured values (Behrens and Stuke, 2003) for AMS-B1, PS and FR samples.…”

Section: Experimental Methods 21 Synthesis Of Hydrous Samplesmentioning

confidence: 99%

Heat capacity, configurational heat capacity and fragility of hydrous magmas

Genova

Romano

Giordano

et al. 2014

Geochimica et Cosmochimica Acta

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International audienceThe glassy and liquid heat capacities of four series of dry and hydrous natural glasses and magma as a function of temperature and water content (up to 19.9 mol%) were investigated using differential scanning calorimetry (DSC). The analyzed compositions are basalt, latite, trachyte and pantellerite. The results of this study indicate that the measured heat capacity of glasses (Cpg) is a linear function of composition and is well reproduced by the empirical model of Richet (1987). For the investigated glasses, the partial molar heat capacity of water can be considered as independent of composition, in agreement with Bouhifd et al. (2006). For hydrous liquids, the heat capacity (Cpliq) decreases nonlinearly with increasing water content. Previously published models, combined with the partial molar heat capacity of water from the literature, are not able to reproduce our experimental data in a satisfactory way. We estimated the partial molar heat capacity of water (CpH2O) in hydrous magma over a broad compositional range. The proposed value is 41 ± 3 J mol-1 K-1. Water strongly affects the configurational heat capacity at the glass transition temperature [Cpconf (Tg)]. An increases of Cpconf (Tg) with water content was measured for the polymerized liquids (trachyte and pantellerite), while the opposite behavior was observed for the most depolymerized liquids (basalt and latite). Structural and rheological implications of this behavior are discussed in light of the presented results

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“…The water contents of the pre-hydrated glasses were determined by Karl Fischer titration (KFT) (for this method, see Behrens et al 1996), and Fourier transform infrared spectroscopy (FTIR). The water contents of experimental glasses were determined by near-infrared (NIR) and mid-infrared (MIR) spectroscopy if a suitable amount of glass was available or was determined with the electron microprobe "by-difference."…”

Section: Analysis Of Water Concentration In Glassesmentioning

confidence: 99%