Development of a sequential injection gas diffusion system for the determination of ammonium in transitional and coastal waters

Ricardo Alves Segundo, Raquel Beatriz Ribeiro Mesquita, Maria Teresa Soares Oliveira Barbosa Ferreira, Catarina Fernanda Carvalho Pinheiro Teixeira, Adriano Agostinho Bordalo, António Osmaro Santos Silva Rangel*

*Autor correspondente para este trabalho

Resultado de pesquisarevisão de pares

31 Citações (Scopus)
3 Transferências (Pure)

Resumo

This work describes the development of a sequential injection system for the ammonium determination in transitional and coastal waters with a wide salinity range. Estuarine waters are rather complex matrices as their characteristics change considerably along the salinity gradient, as well as the ammonium levels. The developed system effectively solves these issues by converting ammonium into ammonia and using a gas diffusion unit (GDU) for matrix removal. The ammonium determination in a wide quantification range (0.1-5.0 mg L-1) was obtained with small changes in the protocol sequence and was applied, not only to estuarine samples, but also well water samples (low salinity) and coastal waters (higher salinity). Spectrophotometry was the chosen detection system to measure the absorbance change in the bromothymol blue acid base indicator caused by the diffusion of ammonia through the GDU. Additionally, the developed system used a green chemistry approach, as there was no indicator reagent consumption per determination, still maintaining a good precision (relative standard deviation lower than 2%) and a low detection limit, 27 μg L-1 (1.5 μM).

Idioma originalEnglish
Páginas (de-até)2049-2055
Número de páginas7
RevistaAnalytical Methods
Volume3
Número de emissão9
DOIs
Estado da publicaçãoPublicado - 1 set. 2011

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