Quantitative assay of copper, iron, nickel, and zinc in fuel ethanol samples by flame atomic absorption spectrometry - de Oliveira, Marcelo Firmino; Balbo, Valdir Roberto; de Andrade, Jose Fernando; Saczk, Adelir Aparecida; Okumura, Leonardo Luiz; Stradiotto, Nelson Ramos [UNESP] (Springer, 2008)