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Register a new userدراسة بمطيافية ما تحت الأحمر لمعقدات بعض البوليميرات الحاوية مجموعات فسفورية وكربوكسيلية مع أيونات Eu + ٣ و + ٣ Sm و + ٣ La
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Added by
Damascus University ورقة بحثية
Publication date
1999
fields
Chemistry
and research's language is
العربية
Created by
Shamra Editor
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حضرت البوليميرات الذوابة بالماء بشكلها الحمضي و الملحي انطلاقا من فنيل حمض الفسفور مع حمض الأكريليك ، و حمض ميتا الأكريليك، و بلا ماء حمض المالئيك. حددت هوية المنتجات المحضرة بالطرائق الكيميائية، و الكروماتوغرافية، و مطيافية ما تحت الأحمر.
No English abstract
References used
Y. Sasaki, G. Choppin, Solvent Extraction of Europium , Thorium, Uranium,Neptunium and Americium with N N-dimethyl N Ndihexy l -٣ - Oxapentanediamide and its analogous compounds . J . Anal . Sciences
A .T Kandil, S.M. Elmedani, Lanthanides extraction by ٨-٩ qinolinol by a mixture of quinolinol and trioctylphosphine oxide . J. separation science and technology
N. V. Gehrbehlehu. et al. Synthesis and Infrared and Moessbauer Spectrometric Study of Europium (٣) Complexes with some Derivatives of semi and Thiosemicarazide, J.Inorganic Chemistry
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A product study of the reaction of some five-membered heteroaromatic
primary amines with formalin in Acetonitrile was made: Aminols of general
formula (G-NH-CH٢OH) were identified in most cases at pH (٧،٥-٩) in good
yield. Reaction of ٥-methyl ٣-A
minoisoxazol with formalin under basis media
(pH~٩) give the Aminal (G-NH-CH٢-NH-G).
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.
It is well known that arch is a main part of the historical structures. Therefore, many techniques are used to strengthen these arches. In this paper, Fiber Reinforced Polymer (FRP) is used to reinforce the arch under vertical loads. Materially Non-L
inear Analysis (MNLA) is performed to demonstrate the behavior of the arch with and without the FRP.
On the other hand, the effect of FRP lamina thickness and length is undertaken in this research. This paper shows that a small amount of the FRP to some local areas can enhance the ultimate strength of the arch significantly.
The aim of this study was to control the content of some commercial products containing amino acid (Arginine) available in the local market in addition to other products containing creatine and protein. Three methods were used for quantitative determ
ination of amino acids Kjeldahl method depending on the total content of nitrogen, assay by the visible radiation using Spectrophotometer after ninhydrin derivatization and high performance liquid chromatography with pre-column O-phtadelaldehyde derivatization using fluorescence detector. There were no significant differences in the results obtained by the three used methods. The results revealed that dietary supplements containing creatine and protein were conform to the European pharmacopoeia specifications, regarding products containing arginine used as medication and locally manufactured, they were conform to pharmacopoeia specifications while the illegal dietary supplement containing arginine were not conform.
The evolution of Polymers which are produced by the binding of many
structural units, i.e. monomers in series, has led to one of the most important
revolution in the twentieth century. Besides their resistive and plastic
properties which match tho
se of metals, they are better than those in many
characteristics as they are lighter, cheaper and above all easier to manufacture.
Polymers are in every day life usage, starting from consumptional commedities
(containors) through the most developed applications such as in space sectors
and space navigation, and as molecular lock –and- key elements in medicine
and chemical reaction activation and filtering, in addition to their use in
intercalation chemistry and in biological sensors, biocompatibility and organic
transistors among others.
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