title: Determination of formaldehyde in Brazilian alcohol fuels by flow-injection solid phase spectrophotometry.
abstract: In this work, a solid phase spectrophotometric method in association with flow injection analysis for formaldehyde determination has been developed with direct measurement of light-absorption in C(18) material. The 3,5-diacetyl-1,4-dihydrolutidine produced from the reaction between formaldehyde and fluoral P was quantitatively retained on C(18) support and the spectrophotometric detection was performed simultaneously at 412nm. The retained complex was quickly eluted from C(18) material with the eluent stream consisting of a 50% (v/v) ethanol solution. The results showed that the proposed method is simple, rapid and the analytical response is linear in the concentration range of 0.050-1.5mgL(-1). The limit of detection was estimated as 30mugL(-1) and the R.S.D. 2.2% using a sample volume of 625muL. The system presented an analytical throughput of 20 determinations per hour. The method was successfully applied in the determination of formaldehyde in ethanol fuel.
authors.affiliation: Instituto de Quimica-Universidade Federal da Bahia, Campus Universitário de Ondina, 40.170-280-Salvador, Bahia, Brazil; Departamento de Engenharia e Arquitetura-Universidade Salvador-UNIFACS-Av. Cardeal da Silva 132, 40.220-141-Salvador, Bahia, Brazil.
authors.forename: Leonardo S G
authors.initials: LS
authors.lastname: Teixeira
authors.forename: Elsimar S
authors.initials: ES
authors.lastname: Leão
authors.forename: Alaílson F
authors.initials: AF
authors.lastname: Dantas
authors.forename: Heloísa L C
authors.initials: HL
authors.lastname: Pinheiro
authors.forename: Antonio C S
authors.initials: AC
authors.lastname: Costa
authors.forename: Jailson B
authors.initials: JB
authors.lastname: de Andrade