Convection-Diffusion Theory of Sample Dispersion in Flow Injection Analysis System

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (8): 1186.

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Convection-Diffusion Theory of Sample Dispersion in Flow Injection Analysis System

ZOU Gong-Wei, LIU Zhen

Department of Chemistry, Nanjing University, Nanjing, 210093

Received:1994-09-14 Revised:1995-01-15 Online:1995-08-24 Published:1995-08-24

Abstract

Abstract: Two methods were used to solve the convection-diffusion equation which appropriate to straight single-tube Flow Injection Analysis(FIA)system without chemical reaction,and the concentration distribution of the slug-injected sample after dispersing in the tube was obtained.E-Curve was thereby obtained.Effects of inner radius of tube,length ofreaction tube,length of sampling tube,flow rate and diffusion coefficient on peak shape anddispersion were discussed.The relationship between half peak width and diffusion coefficientwas solved by numerical method.Two methods to determine diffusion coefficient by FIA were suggested.This paper offered a theoretical guideline for design of FIA system,selection of indicator and operating condition.

Key words: Flow injection analysis, Sample dispersion, Convection-diffusion

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ZOU Gong-Wei, LIU Zhen . Convection-Diffusion Theory of Sample Dispersion in Flow Injection Analysis System[J]. Chem. J. Chinese Universities, 1995, 16(8): 1186.

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Convection-Diffusion Theory of Sample Dispersion in Flow Injection Analysis System

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