2006•Metallurgical AnalysisRequires access

Spectrophotometric determination of trace iron in Fe(III)-potassium thiocyanate-methyl violet-polyvinyl alcohol system

Sun Wei

Abstract

A new spectrophotometric method for the determination of trace iron? was developed.In the sulfuric acid medium of pH 2 and in the presence of polyvinyl alcohol,Fe? reacts with potassium thiocyanate and methyl violet to form a complex compound with the composition of 1∶4∶1.The maximum absorption wavelength of the complex is located at 500 nm and the apparent molar absorptivity is e=3.65×10~5 L·mol~-1·cm~-1.Beer's law is obeyed in the range of 0.027-6 μg /50 mL.RSD is 2.48% for 2 μg Fe?(n=6).The method has been used to the determination of trace iron in water.

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Key concepts: Molar absorptivity, Potassium thiocyanate, Chemistry, Polyvinyl alcohol, Spectrophotometry, Sulfuric acid, Thiocyanate, Alcohol