تحديد الحديد الثنائي باستخدام الكاشف العضوي - 4 [(4-أمينو-3-هيدروكسي فينيل) ديازينيل]-3-هيدروكسي نفتالين-1- حمض السلفون بالطريقة الطيفية اللونية
Keywords:
4-[(4-amino-3-hydroxyphenyl) diazenyl]-3-hydroxynaphthalene-1-sulfonic acid, Direct Spectrophotometric Method, Determination of Iron (II) by Visible spectrophotometric range.Abstract
The possibility of formatting a colored complex between Fe2+ ions and 3-Hydroxy-4-[ (2-hydroxy benzylidene) amino] naphthalene-1- Sulphonic Acid was studied by spectrophotometric method for determination of Iron in aqueous solutions. The reagent reacts in aqueous medium in presence Britton buffer (pH=5) to give a Yellow-Orange complex with maximum absorbance at λmax=415nm. The stoichiometric composition of complex is (1:2). The molar absorptivity and complex constant formation were found to be ε=2.664×104l. mol-1.cm-1 and βk =4.608×103. We have studied all factors which affect the complex formation. Beer-Lambert was obeyed within the range (0.2-6) mg/l with a detection limit of 0.052 mg/l. The developed method was examined on Iron standard solutions, and the Relative Standard Deviation is (RSD%≤4.76), and the recovery ( 98.3-105 )%. All results showed the accuracy, reliability and confirming the possibility of using the reagent to determination of Iron
