Studies in absorption phenomena at an electrode surface

Imperial Users onl

The design of Flow Injection manifolds to give the best detection limits for methods involving on-line chemical derivatisation Part 1. Theoretical basis for high sensitivity

The criteria to be considered when designing a flow-injection manifold for the highest sensitivity for a method based on measurement of the peak height corresponding to a derivative formed on-line between the injectate and a reagent. These criteria include the ratio of reagent concentration to determinand concentration at the peak maximum, the concentration of the top standard and the reagent composition. These three parameters can be combined to give a single parameter referred to as the a-value being the ratio of the determinand to reagent dispersion coefficients at the peak maximum for the top standard. It is shown, on the basis of the single, well-stirred tank model that the required dispersion coefficient is (1 + a) for both a single-line and a double-line manifold. It is further shown that the throughput for the former manifold would be higher than that of the latter

Flow Injection Analysis Concepts and Misconceptions

Aspects of definitions of analytical chemistry and flow injection analysis are discussed. The driving force in analytical research of cost-effectiveness is identified and the characteristics of flow injection examined. Basic concepts of fluid flow relevant to flow injection are explained and some common misconceptions concerning the magnitude of various phenomena examined. The implications fa the design of manifolds for high sensitivity are evaluated and some practical problems addressed. Novel features of FI, which take advantages of the kinetic nature of suitable processes, are identified and illustrated by some of Professor Ishibshi\u27s work