Trace levels determination of ammonium by flow injection analysis using gas-diffusion and capacitively coupled contactless conductivity detection
Tipo
Artigo
Data de publicação
2011
Periódico
Electroanalysis
Citações (Scopus)
17
Autores
Braz H.L.
Ito D.T.
da Silva J.A.F.
do Lago C.L.
Pedrotti J.J.
Ito D.T.
da Silva J.A.F.
do Lago C.L.
Pedrotti J.J.
Orientador
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Programa
Resumo
A sensitive analytical method based on gas-diffusion flow injection system for ammonium ion determination at trace levels with capacitively coupled contactless conductivity detection (C4D) is described. The effects of the chemical composition of the acceptor stream, operating frequency of the conductivity detector, acceptor and donor flow rates, injected volume, and some potential interferents were evaluated. By injecting 100μL samples, the analytical method showed linear response for ammonium from 2.0 up to 100μmol L-1 and a limit of detection of 0.8μmol L-1 (14 ppb). At a flow rate of 0.10mL min-1 for the acceptor solution, an analytical throughput of 35 injections per hour was achieved. The new flow injection system was successfully applied for ammonium determination in rainwater from São Paulo city. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.