Spectrophotometric determination of thallium in zinc and zinc-base alloys with iodoacetic acid and hexamethylenetetramine.
Thallium(III) forms a ternary complex of yellow colour with iodoacetic acid and organic bases, especially hexamethylenetetramine. The complex is soluble in water and various organic solvents. Zinc, copper, cadmium and iron do not form complexes with these reagents, so that a spectrophotometric determination of thallium in zinc and its alloys is possible. The limit of detection is 15 microg g(-1), the molar absorption coefficient about 2000 mol(-1) l(-1) cm(-1).
Mihajlović
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Technical Control Department, Iron and Steel Work "Skopje", 91000, Skopje, Macedonia.
Stafilov
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