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Sensitive Flotation-Spectrophotometric Determination of Gold, Based on the gold(I)-iodide-methylene Blue System

Sensitive Flotation-Spectrophotometric Determination of Gold, Based on the gold(I)-iodide-methylene Blue System

Z Marczenko, K Jankowski

Talanta. 1985 Apr;32(4):291-4.

PMID: 18963845

Abstract:

The gold(I)-iodide-Methylene Blue (MB) system is suitable for flotation separation and spectrophotometric determination of gold. Under the optimum conditions [(MB(+))(AuI(2)(-))].3[(MB(+))(I(3)(-))] is formed, and floated with cyclohexane. The product is dissolved in methanol and its absorbance measured. The molar absorptivity is 3.4 x 10(5)1.mole(-1).cm(-1) at 655 nm. The proposed method is more than three times as sensitive as the Rhodamine B method. Pt, Pd, Ag and Hg interfere seriously, and Ir, Rh, Bi and Cd to a smaller extent. Preliminary separation of gold by precipitation with tellurium as a collector is recommended. The method has been applied to determination of gold traces (about 1 x 10(-4)%) in a copper sample.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP10294312	Gold(I) iodide		10294-31-2	Price

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