Determination of tin in ores, steel and alloys with gallein after extraction as the iodide / Elsie M. Donaldson, Mineral Sciences Division. : M34-20/195E-PDF

“A method for determining up to about 3.5% of tin in ores and mill products is described. After sample decomposition, tin is separated from the matrix elements by toluene extraction of tin(IV) iodide from a 2M sulphuric acid - 1.5M potassium iodide-tartaric acid medium, then back-extracted into 2% sodium hydroxide solution. The red complex formed between tin(IV) and gallein is extracted into n-amyl alcohol from a monochloroacetic acid-ascorbic acid medium, and the absorbance of the extract is determined at 496 nm. Arsenic, antimony, germanium, and thallium are partly extracted as iodides under the proposed conditions, but large amounts of arsenic and moderate amounts of antimony, germanium, and thallium may be present in the sample solution without causing error in the results. The proposed method is also applicable to steel and copper-, aluminum-, zinc-, and zirconium-base alloys"--Abstract, p. i.

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