Ceric sulphate titration methods

PERMANGANATE, DICHROMATE AND CERIC SULPHATE TITRATION METHODS... 

A number of pharmaceutical substances and dosage forms may be determined by the help of ceric sulphate titration methods as given in Table 6.1. 

Table 6.1 Redox Titrations Ceric Sulphate Titration Method...

Discuss the various theoretical aspects involved in the assay of permanganate, dichromate and ceric sulphate titration methods. Give equations to explain your logical stand. 

Some of the volumetric methods described above may also be adapted to the electrometric determination of arsenic. Such methods have been described for titration of arsenites with ceric sulphate,9 iodine in the presence of sodium bicarbonate,10 chloramine (p-toluene-sulphone chloramide),11 alkaline potassium ferricyanide solution,12 potassium bromate13 or potassium iodate14 in the presence of hydrochloric acid, silver nitrate15 (by applying a secondary titration with 01N alkali to maintain the desired low H+-ion concentration), and with... 

Other methods which have been suggested for total penicillins include one in which potassium ferricyanide is used as an oxidising agent, the excess ferricyanide being back-titrated with ceric sulphate and a method in which the /3-lactam structure of penicillin is reacted with an amine dye [AT-(l-naphthyl-4-azobenzene)ethylenediamine] to give a coloured condensation product. ... 

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