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An Inexpensive Detector for Absorbance Measurements in Flow-Injection Analysis

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Peter C. Hauser and Norman E. Cates

University of Auckland, Chemistry Department, Private Bag 92019, Auckland, New Zealand

J. Chem. Educ., 1996, 73 (2), p 191

DOI: 10.1021/ed073p191

Publication Date (Web): February 1, 1996

Section:

History, Education, and Documentation

Abstract

A photometric transducer for peak detection in flow-injection analysis is described. It relies on a light-emitting diode as the light source and a photodiode as the detector. A logarithmic amplifier is used in order to emulate Beer-Lambert's Law and to directly obtain absorbance readings. The performance has been tested with two commonly employed flow-injection procedures, but the device should be suitable for most methods that may be used in the teaching lab.

Keywords (Audience):

Second-Year Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Subject):

Electrolytic / Galvanic Cells / Potentials

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This article has been cited by 3 ACS Journal articles (3 most recent appear below).

An Open-Ended Experiment: Development from Batch to Automated Flow Injection Analysis for Phenolics Determination
Sergio Petrozzi
Journal of Chemical Education2009 86 (11), 1311
- An Open-Ended Experiment: Development from Batch to Automated Flow Injection Analysis for Phenolics Determination
  Sergio Petrozzi
  Journal of Chemical Education2009 86 (11), 1311
  This student-design project, consisting of three types of experiments, involves the development of a continuous colorimetric method for analyzing phenol. With the goal of enhancing student motivation, this open-ended experiment is presented as a ...
  Abstract | Hi-Res PDF | PDF w/ Links
Determination of Hypochlorite in Bleaching Products with Flower Extracts To Demonstrate the Principles of Flow Injection Analysis
Luiz Antônio Ramos , Kátia Roberta Prieto , Éder Tadeu Gomes Cavalheiro and Carla Cristina Schmitt Cavalheiro
Journal of Chemical Education2005 82 (12), 1815
- Determination of Hypochlorite in Bleaching Products with Flower Extracts To Demonstrate the Principles of Flow Injection Analysis
  Luiz Antônio Ramos , Kátia Roberta Prieto , Éder Tadeu Gomes Cavalheiro and Carla Cristina Schmitt Cavalheiro
  Journal of Chemical Education2005 82 (12), 1815
  The use of crude flower extracts is proposed to teach the principles of flow injection procedures. In this experiment a bleaching reaction between hypochlorite and the anthocyanins contained in the flower extracts is examined. The bleaching of the crude ...
  Abstract | Hi-Res PDF | PDF w/ Links
A Low-Cost Device for Automatic Photometric Titrations
Fábio R. P. Rocha , Boaventura F. Reis
Journal of Chemical Education2000 77 (2), 258
- A Low-Cost Device for Automatic Photometric Titrations
  Fábio R. P. Rocha , Boaventura F. Reis
  Journal of Chemical Education2000 77 (2), 258
  Electronics is an important topic in chemistry courses. However, the introduction of basic concepts is often difficult and the lab instruments are frequently seen as "black boxes". To address this problem, we propose the construction of a simple, low-cost ...
  Abstract | Hi-Res PDF | PDF w/ Links