Title of article :
A new Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-hydroxy- Phenyl azo) Naphthalene -1- Sulfonic Acid
Author/Authors :
Darweesh, S. A. University of Baghdad - College of Education Ibn -AL- Haitham - Department of Chemistry, Iraq , Hammodi, A. S. University of Baghdad - College of Education Ibn -AL- Haitham - Department of Chemistry, Iraq , Mahmmod, R. M. University of Baghdad - College of Education Ibn -AL- Haitham - Department of Chemistry, Iraq
Abstract :
A simple, rapid and sensitive sp ectrophotometric method has been proposed for the determination of La (III) using 3-hydroxy -4-(2-hydroxy-phenyl azo) naphthalene -1- sulfonic acid as a chromogenic reagent. This method is based on the formation of a red-pink colored complex, upon the reaction of La(III) with the reagent in an alkaline medium (pH= 9.50), having a maximum absorbance at 459 nm. Beer s law is valid in the concentration range 0.5-12 μg.ml-1 with a Sandell s sensitivity value of 0.0188 μg.cm-2 and molar absorptivity of7376.12 L.mol-1.cm-1. The stoichiometric composition of the chelate is 1:3. The effect of the presence of different cations as interferants in the determination of La(III) under the given optimum conditions were investigated
Keywords :
Spectrophotmetric , Determination of La (III) , 3 , Hydroxy , 4 , (2 , hydroxy , Phenyl azo) Naphthalene , 1 , Sulfonic Acid
Journal title :
Ibn Alhaitham Journal For Pure and Applied Science
Journal title :
Ibn Alhaitham Journal For Pure and Applied Science
