Open AccessDetermination of Ozone or Hypochlorite in Waters Based on Digital Images Analysis Using Same Reagent
Author(s) -
Lorrayne Moreira Zampier,
André Fernando Oliveira,
Fernanda Fernandes Heleno,
Maria Eliana Lopes Ribeiro de Queiroz,
Antônio Augusto Neves,
Sergio L Olivo
Publication year - 2021
Publication title -
journal of the brazilian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.337
H-Index - 70
eISSN - 1678-4790
pISSN - 0103-5053
DOI - 10.21577/0103-5053.20210106
Subject(s) - hypochlorite , reagent , ozone , analyte , chemistry , malachite green , rgb color model , digital image , computer science , chromatography , image (mathematics) , artificial intelligence , image processing , organic chemistry , adsorption
Ozone and hypochlorite are used for the disinfection of water and is essential to monitor these. In this paper, methods based on digital images were developed to determine these analytes in waters using the malachite green dye. The oxidation of the reagent with ozone was very fast and with hypochlorite occurred in 10 min in pseudo-first-order kinetics. New software called ICCA was developed for the capture and processing of red, green and blue (RGB) data, which is planned for digital image analysis. In addition, the recently proposed parameters analytical resolution and N9 were used to define some study conditions. An evaluation of different response functions and white correction of the webcam were done, having thrown some light on the subject to this theme. Their optimization showed a linear range from 0.6 mg L-1 to 5.0/6.0 mg L-1 (O3/Cl, respectively). The figures of merit were similar for both. The methods were validated and the recoveries achieved were between 85.0 and 96.0% (ozone) and 101.0 and 119.0% (hypochlorite).