A method of quality apprarisal for gold products was introduced and several useful formulas for purity calculation, impurity element-estimation and temperature effects have been also deduced.
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杨清秀.金品纯度的比重法测定[J].稀有金属材料与工程,1993,(6):63~66.[Yang Qingxiu. Quality Appraisal of Gold Products by Density[J]. Rare Metal Materials and Engineering,1993,(6):63~66.] DOI：[doi]