Strength Soxhlet

Analytical Supercritical Fluid Extraction and Chromatography Supercritical fluids, especially CO9, are used widely to extrac t a wide variety of solid and hquid matrices to obtain samples for analysis. Benefits compared with conventional Soxhlet extraction include minimization of solvent waste, faster extraction, tunabihty of solvent strength, and simple solvent removal with minimal solvent contamination in the sample. Compared with high-performance liquid chromatography, the number of theoretical stages is higher in... 

Dissolution of the powder. After homogenising the powder, obtained either directly by drilling or by cmshing core shces, a part is weighed precisely and dissolved in a constant amount of liquid, most frequently in concentrated nitric acid solution with ISA (ionic strength adjuster). In this way the total or acid soluble chloride content is determined. The dissolution process is the most important step determining the reproducibility of the chloride analysis. Alternatively, the Soxhlet extraction technique (reflux of boiling water on the concrete powder for 24 h) is used to dissolve chloride ions. Both methods result in a similar total chloride content. 

The equipment used in this method, for example, Soxhlet and other glassware, requires specific materials of low mechanical strength, with glass with different shapes and protrusions and higher and lower resistance to temperature changes and mechanical shocks ... 

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