Abstract
As part of a study to evaluate the use of ternary complexes in photometric methods of analysis, three model systems involving titanium(IV) and tiron plus iminodiacetic acid, nitrilotriacetic acid or diethylenetriaminepenta-acetic acid have been investigated. The methods were compared in terms of working range, molar absorptivity, standard deviation, coefficient of variation, slope of calibration line, limit of detection and limit of determination. The extent of interference from 20 other ions was also examined. The nitrilotriacetic acid system was shown to have better selectivity than the other two.
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