Open AccessEXPLORATORY ANALYSIS OF THE CONCENTRATIONS OF METALS Na, Ca, Mg, Sr AND Fe IN AQUEOUS EXTRACT OF CRUDE OIL, DETERMINED BY ICP OES, AFTER OPTIMIZATION BY EXPERIMENTAL DESIGN
Author(s) -
Murilo de Oliveira Souza,
Karla Pereira Rainha,
Eustáquio Vinícius Ribeiro de Castro,
Maria Tereza Weitzel Dias Carneiro,
Rafael de Queiroz Ferreira
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 - 10.5935/0100-4042.20150095
Subject(s) - inductively coupled plasma atomic emission spectroscopy , chemistry , inductively coupled plasma , aqueous solution , environmental chemistry , heavy metals , strontium , analytical chemistry (journal) , chromatography , plasma , physics , quantum mechanics , organic chemistry
The purpose of this study was to evaluate the best operating conditions of ICP OES for the determination of Na, Ca, Mg, Sr and Fe in aqueous extract of crude oil obtained after hot extraction with organic solvents (ASTM D 6470-99 modified). Thus, the full factorial design and central composite design were used to optimize the best conditions for the flow of nebulization gas, the flow of auxiliary gas, and radio frequency power. After optimization of variables, a study to obtain correct classification of the 18 samples of aqueous extract of crude oils (E1 to E18) from three production and refining fields was carried out. Exploratory analysis of these extracts was performed by principal component analysis (PCA), hierarchical cluster analysis (HCA) and linear discriminant analysis (LDA), using the original variables as the concentration of the metals Na, Ca, Mg, Sr and Fe determined by ICP OES