SYMPOSIA PAPER Published: 01 January 2011
STP49342S

Water Content Determination in Biodiesel: Optimization of Methodology in Coulometric Karl Fischer Titration

Source

Coulometric Karl Fischer (KF) titration is a highly accurate technique employed for moisture determination in non-aqueous solvents. Methodology for coulometric titration in a KF apparatus coupled to an autosampler oven was optimized in order to improve the accuracy of moisture determination in biodiesel derived from soybean. Several parameters were investigated, and three of them were optimized according to a central composite 23 star experimental design. The highest accuracy for moisture determinations corresponded to a relative standard deviation of 1.48 %. It was reached when the KF titrator was operated with electrode without diaphragm, the sample mass was 4 g, and the oven temperature was set to 170°C. Other parameters, like carrier gas flux and extraction time, presented minimal or no effects for improving the accuracy of moisture determination.

Author Information

Vicentim, M., P.
Laboratório de Análise Orgânica, Rio de Janeiro, Brazil
Sousa, M., V. Barreto
Laboratório de Análise Orgânica, Rio de Janeiro, Brazil
da Silva, V., Fernandes
Laboratório de Análise Orgânica, Rio de Janeiro, Brazil
Mateus, V., Lionel
Laboratório de Análise Orgânica, Rio de Janeiro, Brazil
Rodrigues, J., M.
Laboratório de Análise Orgânica, Rio de Janeiro, Brazil
da Cunha, V., Smarçaro
Laboratório de Análise Orgânica, Rio de Janeiro, Brazil
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: D02
Pages: 42–50
DOI: 10.1520/STP49342S
ISBN-EB: 978-0-8031-8677-4
ISBN-13: 978-0-8031-3411-9