Determination of acetate, nitrate, iron(II), iron(III) and copper in fuel ethanol by using ion chromatography

Author(s)

Jailson Cardoso Dias

• Document type: Doctoral Thesis
• Press: Campinas, SP.
• Institution: Universidade Estadual de Campinas (UNICAMP). Instituto de Química
• Defense date: 2010-03-22

Examining board members

Lauro Tatsuo Kubota; Nelson Ramos Stradiotto; Ricardo Erthal Santelli; Paulo de Tarso Vieira e Rosa; Isabel Cristina Sales Fontes Jardim

• Advisor: Lauro Tatsuo Kubota

Abstract

The overall context of this work is in the area of development of analytical methods for the chromatographic separation and detection of ions in biofuels. Several optimization procedures (uni- and multivariate) were performed initially in order to establish the best conditions for an efficient and selective separation of different analytes. Subsequently, the main analytical parameters were investigated to assess the performance and applicability of each method. In all, three methods were optimized, validated and applied to the analysis of fuel ethanol, the first being for the determination of nitrate and acetate and the others for the determination of iron(II), iron(III) and copper (eluents based on dipicolinic and chelidamic acids). The techniques of high performance ion-exchange chromatography with conductivity detection (HPIEC-CD) and high performance chelation ion chromatography with photometric detection (HPCIC-PD) were used for the anionic compounds and metal ions, respectively. Overall, the results showed good analytical performance for the three methods developed. With the exception of the iron(II), all other analytes were detected at mg L levels. Finally, several samples of hydrated fuel ethanol were analyzed with no pretreatment to demonstrate the applicability of each method (AU)

• FAPESP's process: 06/03960-1 - Development and validation of method for the simultaneous determination of copper, iron, sodium, nitrate and acetate ions in fuel ethanol using ion chromatography
• Grantee: Jailson Cardoso Dias
• Support Opportunities: Scholarships in Brazil - Doctorate