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Fire Assay - Gold
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an assay method using fire assay fluxes to decompose the sample and collect Au. After cupelation to produce a prill, Au is parted nitric acid digestion. The remaining Au flake may be weighed - gravimetric determination - or dissolved in Aqua Regia for determination by AAS or ICP. This is the most suitable method for determination of ore-grade concentrations of Au in rocks and drill core. www.acmelab.com
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