Determination of zinc in trace-element superphosphate by A.C. polarography

Abstract

Zinc has been effectively determined in “trace-element superphosphate” with an a.c. polarographic technique. This technique is both rapid and accurate and compares favourably with the atomic-absorption method. The zinc is maintained in solution by polarographing in an acid electrolyte of M hydrochloric acid at a pH of less than 1. The method eliminates the time-consuming process of separation from interfering ions.

The presence of the hydrogen reduction wave does not materially interfere with the zinc reduction wave as happens in conventional d.c. polarography.