Autor(es):
Páscoa, Ricardo N.M.J. 
; Tóth, Ildikó V. ; Rangel, António O.S.S.
Data: 2009
Identificador Persistente: http://hdl.handle.net/10400.14/2645
Origem: Veritati - Repositório Institucional da Universidade Católica Portuguesa
Descrição
We developed a sequential injection analysis (SIA) method for the determination of iron in coastal, ground,
and surface fresh waters using two different reagents (ferrozine and 1,10-phenathroline). The methodology uses
a double-line SIA system to improve mixing conditions between sample and reagent solutions. A liquid waveguide
capillary cell (LWCC) with 1.0 m pathlength, 550 μm i.d., and 250 μL internal volume was used to
enhance the sensitivity of the determination. The detection limits for the ferrozine and 1,10-phenanthroline
reagent were 0.15 and 0.35 μg L–1, respectively. The system provides a linear response up to 20 μg L–1 and has a
high throughput rate (41 h–1), low reagent consumption, and also low effluent production for both reagents.
The developed method was applied to natural waters (river, well, ground, potable, and sea waters) and one reference
water sample.
