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DIN EN ISO 17993:2004
Water quality - Determination of 15 polycyclic aromatic hydrocarbons (PAH) in water by HPLC with fluorescence detection after liquid-liquid extraction (ISO 17993:2002); German version EN ISO 17993:2003
With a scope of describing a manual method of making measurements for the determination of volume fraction of major phases in advanced technical ceramics using micrographs of polished and etched sections, overlaying a square grid of lines, and counting the number of intersection lying other each phase.
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Deutsches Institut für Normung [din]