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Advisor(s)
Abstract(s)
A sequential injection analysis system for the turbidimetric determination of chloride in different types of
water is proposed. The determination is based on the reaction of chloride with silver ions and the subsequent
measurement of the turbidity caused by silver chloride precipitation. In this method, the use of toxic reagents,
such as mercury thiocyanate, commonly employed in most spectrophotometric techniques for chloride
determination, is avoided. The main feature of the developed system is the use of a single configuration to
carry out the determination over a wide concentration range (2–400 mg L21) by changing only the aspirated
sample volume. This characteristic allows the determination of chloride in ground, surface and wastewaters
using the same manifold. In addition, a considerable saving of precipitating reagent is achieved due to noncontinuous
consumption. The results obtained with the developed system were statistically indistinguishable
from those of the potentiometric titration reference method. Relative standard deviations for ten consecutive
injections were lower than 3.7%, with a sampling frequency of between 55 and 57 determinations per hour.
Description
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Pedagogical Context
Citation
MESQUITA, Raquel B. R.; FERNANDES, Sílvia M. V.; RANGEL, António O. S.S. - water using a single sequential injection analysis system. journal of environmental monitoring. ISSN 1464-0325. Vol. 4 (2002), p. 458–461
