Development of the continuously variable volume reactor for flow injection analysis: Part 1. Design, capabilities and testing

Linda L. Lipe, Suzanne M. Purinton, Elizabeth Mederios, C. Chad Harrell, Cynthia Efta, Melissa Murray, Meredith Wood, Ray Bernard Portier, Stuart J. Chalk

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

A new apparatus for mixing sample and reagent in flow injection analysis (FIA) is described. The continuously variable volume reactor (CVVR) replaces the conventional mixing coil in a flow injection (FI) manifold to provide mixing and dilution. A linear actuator motor allows control of the chamber volume via LabVIEW software. The chamber volume can be incremented in steps of 1 μl over the range 68-1704 μl. In addition, the chamber has an integral variable-speed stirring unit that is also under computer control. Experiments were performed to evaluate the dispersion characteristics of this new device, evaluate the volume reproducibility, and understand the mixing characteristics. Use of the chamber is shown in the determination of iron(II) in pond water, and in NIST SRM 1643d with excellent results and a detection limit of 3.7 μg/l iron(II). Advantages of the CVVR and future research activities using the device are discussed.

Original languageEnglish (US)
Pages (from-to)287-304
Number of pages18
JournalAnalytica Chimica Acta
Volume455
Issue number2
DOIs
StatePublished - Mar 25 2002

Keywords

  • Automation
  • Flow injection analysis
  • Iron(II) determination
  • Mixing chamber
  • Remote analysis

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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