A simple and fairly selective kinetic method has been developed for the determination of manganese(II) based on its catalytic activity on the autoxidation ofo-hydroxyphenylthiourea (ohptu). It is found that the rate of the reaction is proportional to the concentration of manganese(II) ions. The reaction is carried out in a borate buffer of pH 7.5 and determined effectively in the range of 0.05–0.50 μg of manganese per ml. The methods of tangents and of fixed time are employed. The former method is more accurate than the latter. The present method has been applied to foodstuff like cabbage, tomato and potato wherein manganese plays a vital role in various physiological functions. Many associated metal ions do not interfere in the determination.
Volume 134, 2022
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