3 documents found, page 1 of 1
A semi-continuous analyzer for the fluorimetric determination of atmospheric fo...
Sousa,Eliane Teixeira; Oliveira,Fabio Santos de; Alves,Arnaldo Cardoso; Andrade,Jailson B. deThis paper describes a sensitive and selective semi-continuous analyzer (FORMAL-FLU) for the fluorimetric determination of atmospheric formaldehyde. The method is based on the reaction between formaldehyde and Fluoral-P, producing the fluorescent derivative 3,5-diacetyl-1,4-dihydrolutidine (DDL) which, when excited at 410 nm, fluoresces at 510 nm. This analyzer consists of a gas diffusion chamber with a central...
Cadmium and lead retention in fresh and rotten red meat
Lopes,Mariangela V.; Korn,Mauro; Pereira,Madson de Godoi; Santana,Eliziane Pedra de; Oliveira,Fabio Santos de; Korn,Maria das Graças A.The metal sorption capacity in fresh and rotten red meat was evaluated for Cd2+ and Pb2+ ions at pH 6 and the process involved in the studied metal retention was discussed. For the experimental set, an eight channels multi-port selection valve was employed to mechanise the sample preparation. The cadmium and lead concentrations were determined by ICP-OES. A high retention (> 80%, m/m) of Cd2+ and Pb2+ ions, in ...
Determination of total aldehydes in fuel ethanol by MBTH method: sequential inj...
Oliveira,Fabio Santos de; Leite,Bárbara Cecília O.; Andrade,Marta Valeria A. Santana de; Korn,MauroA sensitive SIA method was developed for total aldehyde determination in automotive fuel ethanol samples. It was based on the selective reaction of aliphatic aldehydes with 3-methyl-2-benzothiazolone hydrazone (MBTH) with the formation of blue dye in the presence of Fe3+. Monosegmentation and binary sampling were employed to increase the sensitivity of the method. In order accelerate reaction rate of MBTH and a...