Methods for vanadium determination in fuel oil by GF AAS with microemulsification and acid digestion sampling

Journal of the Brazilian Chemical Society

Petrobrás-Petróleo Brasileiro, São Francisco do Conde, Brazil¹  Amorim, Fábio Alan C.¹  Ferreira, Sérgio L. C.¹  Amaro, Joana A. A.¹  Universidade Federal da Bahia, Salvador, Brazil¹  Lima, Daniel C.¹  Universidade Federal da Bahia, Barreiras, Brazil¹  Vale, Maria Goreti R.¹ 

关键词: vanadium;    fuel oil;    microemulsion;    digestion sample;    GF AAS;   

DOI  :  10.1590/S0103-50532007000800018

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Two methods for vanadium determination in fuel oil are proposed using GF AAS. The first is based on the preparation of a microemulsion followed by direct injection into the graphite tube. The pyrolysis and atomization temperatures, 1500 and 2700 ºC, respectively, were chosen from the temperature curves. This procedure allows determination of vanadium with a detection limit of 0.10 µg g-1 and characteristic mass of 87 pg. The other method uses total acid digestion of the sample with sulfuric acid, nitric acid and hydrogen peroxide. In this procedure, the pyrolysis and atomization temperatures recommended were 1000 and 2700 ºC, respectively. Among the analytical characteristics for this method are a detection limit of 0.25 µg g-1 and a characteristic mass of 63 pg. The accuracy of both procedures was confirmed by the determination of vanadium in the certified reference material NIST SRM 1634c-trace metals in fuel oil.

【 授权许可】

Unknown