قمنا في هذا البحث باصطناع كل من مركبي فرات الباريوم وفرات الزنك بلون بني محمر وذلك بطريقة الترسيب المشترك
The spectral characteristics of the iron(III) lactate complexes were examined by the spectrophotometric methode, and the absorbance of these complexes has been studied at diferente wavelengthes .
The stoichiometry of the photoreactive complex formed
in the iron(III)-lactate system has been investigated in aqeuous solution under determinative experimental conditions. Initial concentrations whether of Iron(III) or of lactic acid ranged from to , and -values were belonging to the range .
The results showed, that the ratio of iron(III) to lactate in the photoreactive complex is 1:2, i.e. its formula is .
This complex has a maximum absorption at 365 nm. Its molecular absorption coefficient is about ≈ and its dissociation constant is about .
The tentative mechanism for the photochemical decomposition of the complex has been suggested, in agreement with the reference studys . The suggested mechanism depends on the relationship between the absorbance and the photoreaction kinetics, and it is not based on the qualitative or quantitative analysis of reaction products.
In this work, the UV-Visible photolysis aqueous ferrioxalate
complexes has been studied kinetically and
mechanistically, in the absence and presence of molecular oxygen.
This paper outline a new, simple, selective and sensitive spectrophotometric
procedure for the quantitative determination of iron. The bidentate ligand of 2-
(1-Acetyl-2-oxopropyl)acrylonitrile has been synthesized ,and determined by
elemental ana
lysis and infrared spectroscopy. The compound reacts with
Fe(III) to form a colored complex with an absorption maxima at 400nm and
490nm. The effect of pH, amount of reagent, time, temperature and the
interference of many ions on the Fe (III) determination was also estimated.
Beer's law is obeyed for iron concentration in the range (0.23- 4.48μg/ ml) for
spectrophotometric method and (0.56-8.4) for extraction spectrophotometric
method. The molar absorptivity was in the rang 2.70x104-3.46 x 104 L.mol-1cm-1.
Sandall's sensitivity was found to be 1.61 x 10 -3 – 2.07 x 10-3 μg . cm-2.
The RSDs for both spectrophotometric and extraction spectrophotometric
methods were below 3%. The analytical error SD/√n was within 0.021. The
technique has been applied to the determination of iron in alloys and in
pharmaceutical preparations.