Determination of gold in geological materials by atomic absorption spectrometry after bromine and hydrochloric acid extraction at room temperature
✍ Scribed by G.S. Reddi; S. Ganesh; C.R.M. Rao; V. Ramanan
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 309 KB
- Volume
- 260
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
AbStM!t
An acid decomposition procedure at room temperature for the determination of gold in geological materials is described. Sample decomposition is effected by treatment with hydrochloric acid and bromine for 24 h. From the resulting bromine extract the noble metal is coprecipitated with tellurium. The precipitated tellurium metal is collected in toluene. The noble metal, together with tellurium, is then re-extracted into aqua regia for determination by atomic absorption spectrometry. Accurate results were obtained for reference materials and internal standard materials. The precision for a 40-g sample weight was good. The method was found to be ideal for the determination of gold in rocks and placer samples. Large sample weights could be processed, thereby minimizing sampling errors. As no heating is involved, minimum supervision is required during the sample decomposition. The method suits batch analysis, resulting in a high throughput.