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Determination of Hypochlorite in Bleaching Products with Flower Extracts To Demonstrate the Principles of Flow Injection Analysis

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Luiz Antônio Ramos , Kátia Roberta Prieto , Éder Tadeu Gomes Cavalheiro and Carla Cristina Schmitt Cavalheiro

Instituto de Química de São Carlos, Departamento de Química e Física Molecular, Universidade de São Paulo, 13566-950 São Carlos, SP Brazil

J. Chem. Educ., 2005, 82 (12), p 1815

DOI: 10.1021/ed082p1815

Publication Date (Web): December 1, 2005

Section:

History, Education, and Documentation

Abstract

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 extract solution was monitored at 526 nm in pH 2.0 buffer. A typical linear analytical curve was obtained over a hypochlorite concentration of 1.4 to 8.6 x 10^-3 mol L^-1 with a detection limit of 1.5 x 10^-4 mol L^-1. The relative standard deviation was 0.2% for a 2.5 x 10^-2 mol L^-1 hypochlorite solution (n = 10), and 80 determinations per hour were obtained. These parameters could be obtained by the students in a four-hour laboratory.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Dyes / Pigments

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This article has been cited by 1 ACS Journal articles (1 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 ...
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