title: A novel approach for high precision rapid potentiometric titrations: application to hydrazine assay.
abstract: We propose a high precision rapid personal computer (PC) based potentiometric titration technique using a specially designed mini-cell to carry out redox titrations for assay of chemicals in quality control laboratories attached to industrial, R&D, and nuclear establishments. Using this technique a few microlitre of sample (50-100 μl) in a total volume of ~2 ml solution can be titrated and the waste generated after titration is extremely low comparing to that obtained from the conventional titration technique. The entire titration including online data acquisition followed by immediate offline analysis of data to get information about concentration of unknown sample is completed within a couple of minutes (about 2 min). This facility has been created using a new class of sensors, viz., pulsating sensors developed in-house. The basic concept in designing such instrument and the salient features of the titration device are presented in this paper. The performance of the titration facility was examined by conducting some of the high resolution redox titrations using dilute solutions--hydrazine against KIO(3) in HCl medium, Fe(II) against Ce(IV) and uranium using Davies-Gray method. The precision of titrations using this innovative approach lies between 0.048% and 1.0% relative standard deviation in different redox titrations. With the evolution of this rapid PC based titrator it was possible to develop a simple but high precision potentiometric titration technique for quick determination of hydrazine in nuclear fuel dissolver solution in the context of reprocessing of spent nuclear fuel in fast breeder reactors.
authors: Innovative Instrumentation Section, Real Time Systems Division, Electronics & Instrumentation Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamil Nadu, India. sahoop@igcar.gov.in
authors: P
authors: P
authors: Sahoo
authors: N
authors: N
authors: Malathi
authors: R
authors: R
authors: Ananthanarayanan
authors: K
authors: K
authors: Praveen
authors: N
authors: N
authors: Murali