Abstract
An evaluation of the effect of modulation amplitude ( M) and microwave power ( P) on the peak-to-peak amplitude ( A) of the first derivative e.s.r. signal of each of Mn 2+, VO 2+ and Cu 2+ is described. It is shown that A is not directly proportional to M over all values of M and therefore for optimal precision of measurement, M should be kept constant. A varies with P k, where k is a constant for a particular metal ion-solvent system. Limits of detection and concentration ranges of analytical utility are also reported.
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