Spectrophotometric determination of trace cerium in hot-dipping zinc alloy with a new reagent trichloro fluoroarsenazo

A new reagent trichloro fluoroarsenazo(TC-FAsA) is synthesized,and a simple and rapid spectrophotometric method for the determination of trace cerium in hot-dipping zinc alloy with the reagent has been studied.In the strong acid medium,cerium reacts with TC-FAsA to form a stable violet-blue complex,which shows maximum absorption at 620 nm with a apparent molar absorptivity of 1.15×10~5 L·mol~(-1)·cm~(-1).Beer's law is obeyed in the range of 0-25 μg/25 mL for cerium.This method has been used for the determination of trace cerium in zinc alloy with satisfactory results.