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Zhou T.-H.,Zhanjiang Entry Exit Inspection and Quarantine Bureau | Huang J.,Zhanjiang Entry Exit Inspection and Quarantine Bureau | Tian Q.,Zhanjiang Entry Exit Inspection and Quarantine Bureau | Wang W.,Tianjin Agela Technologies Co.
Yejin Fenxi/Metallurgical Analysis

The solid phase extraction column was prepared using novel anion exchange resins. After washed with diluted hydrochloric acid, it was applied to the separation and enrichment of gold in gold-containing sample solution. The separation and enrichment conditions were studied. The results showed that, when 25 mL of 10% (V/V) hydrochloric acid solution passed through the extraction column at 2 mL/min, and the gold in column was eluted with 30 g/L thiourea hydrochloric acid solution, 0.1-5.0 μg/mL gold in sample solution could be enriched and eluted. The eluted gold was determined with inductively coupled plasma atomic emission spectrometer and flame atomic absorption spectrophotometer. Most volatile elements, common metal ions and much Pt(IV), Pd2+, Ir(IV), Rh(III), Ru(III), W(VI) and Mo(VI) had no interference in the determination. The proposed method was applied to the determination of gold in copper concentrate and blister copper. The results were consistent with the fire assaying method. The relative standard deviations (RSD, n=5) were all smaller than 3.5%, and the recoveries were higher than 95%. Source

Liu Y.-F.,Zhanjiang Entry Exit Inspection and Quarantine Bureau | Feng J.-H.,Zhanjiang Entry Exit Inspection and Quarantine Bureau | Li Z.-J.,Zhanjiang Entry Exit Inspection and Quarantine Bureau | Shi Y.-X.,Zhanjiang Entry Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis

Blister copper sample were dissolved in mixed acid of hydrochloric acid and nitric acid. Gold and silver content was determined directly by inductively coupled plasma optical emission spectrometry (ICP-OES) by using 242.794 nm and 328.068 nm as analyzing spectral line. Investigation of the effects of matrix and co-existing ions were studied. It was shown that copper had certain effect on the determination, but can be removed by matrix-matching, while other impurity elements had no influence. The method has been applied to the blister copper and the results are consistent with the results by the method of YS/T521.2-2009, with the relative standard deviations of gold and silver (RSD, n=12) smaller than 1.9% and 1.1% respectively. In addition, the recoveries of testing elements were between 95% and 105%. Source

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