2000•Chinese Rare EarthsRequires access

Catalytic Spectrophotometric Determination of Trace Lanthanum(III) Using Oxidation of Neutral Red with H_2O_2

Rui Chen

Abstract

A kinetic spectrophotometric method for the determination of trace lanthannum(Ⅲ) was established.It was based on the La(Ⅲ) catalyzed the discoloring reaction of neutral red (NR)by hydrogen peroxide(H 2O 2)in HCl medium.The optimum reaction conditions and some kinetic parameters were studied.The determination range of iridium is 0~0.8μg/25mL and the detection limit is 2.6×10 -9 g/mL.This method has been applied to the determination of La(Ⅲ)in simulated samples with satisfactory results.

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Key concepts: Hydrogen peroxide, Chemistry, Detection limit, Iridium, Lanthanum, Catalysis, Neutral red, Kinetic energy