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A Sensor‐Controlled Flow Apparatus for Fast Online Titrations
Author(s) -
Fais Markus,
Schwarz Christina,
Leinweber Felix C.
Publication year - 2016
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201500083
Subject(s) - titration , potentiometric titration , dilution , mixing (physics) , process (computing) , flow (mathematics) , process control , analytical chemistry (journal) , process engineering , signal (programming language) , gran plot , chemistry , computer science , materials science , electrode , titration curve , chromatography , mechanics , engineering , inorganic chemistry , thermodynamics , physics , quantum mechanics , programming language , operating system
A process‐suitable titration apparatus was developed for fast online titrations. It consists of computer‐controlled gradient pumps, a sample dilution setup, mixing devices and a microfabricated flow cell with potentiometric sensor. The flow control of the pumps is done via the electrode response signal and a control program applying the feedback algorithm. The apparatus allows the conduction of titration experiments in time cycles of 30 – 50 s in a continuously flowing sample stream. It is about ten times faster than classical batch titrations while accuracy and precision remain of similar magnitude. The long‐term stability and the applicability to process control are shown in field tests. The presented increase of speed, decrease of size and explosion proof make titrations suitable as online technique in the process industry.