Studies of the binding between elements and ascorbic acid using differential pulse polarography

العناوين الأخرى

دراسة ارتباط بعض العناصر مع حامض الاسكوربيك باستخدام البولاروغرافي النبض التفاضلي

مقدم أطروحة جامعية

Husayn, Muhammad Abd al-Khaliq

مشرف أطروحة جامعية

al-Rufai, Ilham M.

الجامعة

جامعة بغداد

الكلية

كلية العلوم

القسم الأكاديمي

قسم الكيمياء

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2014

الملخص الإنجليزي

Chapter-one : Is a general introduction to the importance of a polarographic technique and it’s application.

An introduction about ascorbic acid, the studied metal and the molecular binding.

 Chapter-two: Gives an information about the polarographic apparatus, the cell, electrodes used, and some technical points specific for it’s experimental work.

 Chapter-three:  Studies the optimum condition for the polarographic measurement, a pulse amplitude 50 mV, scan rate 10 mV.s-1 and 0.1M KCl as a supporting electrolyte.

 Determination of peak potential for the studied metal (-1.05V for Ni(II), -0.63V for Cd(II), -0.16V for Cu(II), -1.39V for Fe(II) and +0.03V for ascorbic acid), by the use of DPP and DC technique.

 Studies the interaction between concentration on peak current which were linear and obeys Ilkovic equation, that means the waves were diffusion controlled.

 The number of electrons involved in the reduction process at the surface of the electrodes were determined by plotting log i/(id-i) VS E obtained by the DC polarograms.

XVI  Verification of the complexation between metal ions (Ni(II),Cd(II), Cu(II) and Fe(II)) and ascorbic acid were carried out by recording the Dpp of the mixture of these ions with ascorbic acid.

 Study the kinetic of the reactions between metal(II)-ascorbic acid system, by determinate the rate constant(the first and second order rate constants), the half-time, and the activation energy, which was done by following the polarographic wave as a function of time.

 Study the kinetic parameters, such as the rate constant and the transfer coefficient, of the electrode reactions, and determined the reversible and irreversible electrode process by plotting log(i/(id-i)) verses E for the D.C polarographic wave.

Kinetic parameters (K0 fh, αn) were calculated by Meites & Israel’s method and Gaur & Bhargava’s method, then study the temperature effect on these parameters.

 Determined the thermodynamic parameters such as free energy change G, enthalpy change H, and entropy change S, for the interaction between metal(II)-ascorbic acid system.

التخصصات الرئيسية

الكيمياء

الموضوعات

• الكيمياء التحليلية

عدد الصفحات

115

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-599738