Abstract
A speetrophotometric study of the new tellurium bismuthiol II reaction has been made to ascertain its suitability for the determination of traces of tellurium. The reaction mechanism is discussed. The yellow tellurium compound which is developed at pH 2.0–2.2 is stable, and is quantitatively extracted by chloroform at pH > 5. Addition of ammonium sulphate increases the rate of extraction. Two procedures, using aqueous solution with an absorption maximum at 395mμ, or solvent extraction with an absorption maximum at 335 mμ, are proposed. The extraction procedure makes the method more selective and sensitive. Many common ions do not interfere when EDTA and citrate are used as masking agents. The interferences from mercury, iron, copper, and selenium are serious. Beryllium or selenium may be used as collecting agents in the presence of EDTA for separation of tellurium. Selenium may subsequently be removed by volatilisation with bromine and hydrobromic acid. The absorptivity and sensitivity of the reaction were found to be 28,000 and 0.005 μg tellurium per cm 2, respectively, at 335 mμ.
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