عنوان المقالة:طریقة طیفیة جدیدة لتقدیر اللانثانوم ( 111 ) باستخدام كاشف 3- هیدر وكسي -2 هیدرروكسي فنیل ازو ) نفثالین - 1- حامض السلفونیك ) -4- A new Spectrophotometric Method For The Determination of La (III) With 3-Hydroxy -4-(2-hydroxy- Phenyl azo) Naphthalene -1- Sulfonic Acid
سمر احمد درویش ، ازهار صادق حمودي ، رؤى مؤید محمود
المؤلفون بالإنجليزي
S. A. Darweesh , A. S. Hammodi , R. M. Mahmmod
الملخص العربي
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 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.
تاريخ النشر
09/11/2010
الناشر
IBN AL- HAITHAM J. FOR PURE & APPL. SCI.
رقم المجلد
24
رقم العدد
1
الكلمات المفتاحية
Spectrophotmetric , Determination of La (III) ,3-Hydroxy -4- (2-hydroxy-Phenyl azo) Naphthalene -1- Sulfonic Acid
رؤى مؤيد محمود | Ruaa Muayad Mahmood | 9699