This certified reference material is intended to be used in the analysis of geological materials -rocks, soils and sediments -or other materials that have a silicate matrix.A unit of OU-6 includes approximately 35 g of pulverised material (98.33% of material < 63 µm and 0.03% > 125 µm) and is packaged in a plastic envelope.
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Potts et al. (2005) studied this question.
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