M. Mahmmod, R., S. Hammodi, A., A. Darweesh, S. (2011). A new Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-hydroxy-Phenyl azo) Naphthalene -1- Sulfonic Acid. , 24(1), 122-134.
R. M. Mahmmod; A. S. Hammodi; S. A. Darweesh. "A new Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-hydroxy-Phenyl azo) Naphthalene -1- Sulfonic Acid". , 24, 1, 2011, 122-134.
M. Mahmmod, R., S. Hammodi, A., A. Darweesh, S. (2011). 'A new Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-hydroxy-Phenyl azo) Naphthalene -1- Sulfonic Acid', , 24(1), pp. 122-134.
M. Mahmmod, R., S. Hammodi, A., A. Darweesh, S. A new Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-hydroxy-Phenyl azo) Naphthalene -1- Sulfonic Acid. , 2011; 24(1): 122-134.

A new Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-hydroxy-Phenyl azo) Naphthalene -1- Sulfonic Acid

Ibn Al-Haitham Journal For Pure And Applied Science
Article 1, Volume 24, Issue 1, 2011, Pages 122-134
Authors
R. M. Mahmmod; A. S. Hammodi; S. A. Darweesh
Abstract
A simple, rapid and sensitive spectrophotometric 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 of 7376.12 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.
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