Open AccessMULTIVARIATE IMAGE ANALYSIS IN CHEMISTRY: pH MEASUREMENTS OF DRINKING WATER
Author(s) -
Deangelis Damasceno,
Thiago Gomes Toledo,
Mariana da Silva Godinho,
Cassiano P. da Silva,
Sérgio Botelho de Oliveira,
Anselmo Elcana de Oliveira
Publication year - 2015
Publication title -
química nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.214
H-Index - 73
eISSN - 1678-7064
pISSN - 0100-4042
DOI - 10.5935/0100-4042.20150082
Subject(s) - multivariate statistics , multivariate analysis , chemistry , environmental chemistry , water chemistry , mathematics , statistics
A Multivariate Image Analysis (MIA) laboratory activity was proposed estimating pH of drinking water samples from its digital images after adding bromothymol blue as a pH indicator, and using the PLS multivariate calibration method. All computational work was done using GNU Octave free software. The MIA-PLS based approach exemplified with drinking water pH estimates is tailored to meet the needs of both students and researchers. MIA-PLS method was statically equivalent to the reference method using a conventional glass pH electrode. This lab activity combines analytical methodology, computing, and chemometrics.