الفهرس 
Chapter I
I.1 : IntroductionOnly 14 pages are availabe for public view
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Abstract
This thesis comprises two chapters: /) Chapter 1: deals with the kinetic spectrophotometric determination of oxalate. A new kinetic spectrophotometric methods for the determination of oxalate has been described, based on its enhancing effect on the oxidation of Mn(II) to Mno4- by potassium periodate measured at 525 nm in phosphoric acid medium in the presence of sodium acetate as activator. Under the optimum conditions of 20 ug/ml Mn(II) in MnSo4.H2O/0.015 mol/1 H3PO4-/0.013 mol/1 sodium acetate/0.003 mol/1 KI04 at 35°C for a fixed time 18 min . A calibration graph from 0.05 to 1.25ug/ml oxalate and a detection limit of 27 ng/ml were obtained. No serious interference was identified. The new method is simple, inexpensive, sensitive and accurate. The applicability of the method was demonstrated by the determination of the oxalate in spinach and urine samples, with the satisfactory results. 2) Chapter 2; deals with the simultaneous determination of some veterinary pharmaceutical, namely, Amprolium-HCl (AMP), Ethopabate (ETH), Sulfaquinoxaline (SQX) in binary mixtures by derivative spectrophotometry. The two components have been determined in presence of each other by the zero-crossing method of the first derivative of the UV absorption spectra of the mixture. Zero-crossing points of SOX-AMP mixture are at 268.2 nm. for SQX and at 253.3 nm for AMP. The corresponding points for the AMP-ETH mixture are at 288.8 nm for AMP and at 320.6 nm for ETH. At the previously fixed points, the respective component can be accurately determined without any interference of the other ones. The method was applied for the determination of authentic mixtures, besides real batches of pharmaceutical formulations. Recoveries are in the range 93.1-101.03 for AMP, 97.4-109 for ETH and 97.2-100.6 for SQX were obtained. Good concordance has been realized for the results obtained by the proposed methods and those obtained by the officially ones.