By Dan P. Manka
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Additional resources for Automated Stream Analysis for Process Control. Volume 1
And Miller, T. , Jr. (1980). Anal. Chem. 52(13), 2023-2026. Stevens, T. , and Small, H. (1978). S. Patent 3,966,596. Stevens, T. , Turkelson, V. , and Albe, W. R. (1977). Anal. Chem. 49(8), 1176-1178. Wheaton, R. M . , and Seamster, A. H. (1966). Kirk-Othmer Encycl. Chem. , 1963-1971 11, 875. A U T O M A T E D STREAM ANALYSIS FOR PROCESS CONTROL, VOL. 1 2 Flow-Injection Analysis: A New Approach to Near-Real-Time Process Monitoring CRAIG B. RANGER QuikChem™ Systems Division Lachat Chemicals, Inc.
T o r e m o v e m o s t of the chloride before the injected s a m p l e e n c o u n t e r s the ion exclusion separator, a ' b r i n e s t r i p p i n g " c o l u m n (Small and S t e v e n s , 1975b) is p a c k e d with a n o t h e r h i g h - c a p a c i t y cation e x c h a n g e resin in the silver ion form and arranged in the s y s t e m as s h o w n in F i g . 16. T h e stripper c o l u m n e x c h a n g e s s a m p l e c a t i o n s , m a i n l y s o d i u m , for silver i o n s , which i m m e d i a t e l y form a silver chloride precipitate that r e m a i n s b e h i n d in the stripper c o l u m n .
N o t e that certain sequential e v e n t s m u s t b e p e r f o r m e d by the analyzer, i . e . , (a) (b) (c) s t r e a m selection, s a m p l e injection, stripper c o l u m n alternation, and (d) s e q u e n c i n g three r e g e n e r a t i o n solutions to the off-line spent stripper column. T. E. MILLER, JR. 28 A s portrayed in F i g . 16, c h r o m a t o g r a p h i c valve switching accomplishes each of the a b o v e steps by m e a n s of p n e u m a t i c actuation through pilot solenoid v a l v e s .