Determination of manganese in grain by potential titration with catalytic end-point indication

A method of catalytic potential titration for the determination of trace ma nganese by using crystal violet ion selective electrode is reported in this paper. It is based on the catalytic effect of manganese (II) on the oxidat ion of crystal violet by potassium periodate in the presence of nitrilotria cetic acid (NTA). The experiments indicated that this technique showed high sensitivity and high accuracy. The results of determination of trace manga nese in grain could be compared with the results obtained by means of atomi c absorption spectrometry. (C) 1999 Elsevier Science B.V. All rights reserv ed.