Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3006
Título: Chlormequat selective electrodes: construction, evaluation and application at FIA systems
Autor: Sales, M. Goreti F.
Lino, Nuno F. M. C.
Paíga, Paula
Palavras-chave: Chlormequat
Growth regulator
Pesticides
Potentiometry
Ion-selective electrode
FIA
Data: 2003
Editora: Taylor & Francis
Relatório da Série N.º: International Journal of Environmental Analytical Chemistry; Vol.83, Issue 4
Resumo: A flow injection analysis (FIA) system having a chlormequat selective electrode is proposed. Several electrodes with poly(vinyl chloride) based membranes were constructed for this purpose. Comparative characterization suggestedthe use of membrane with chlormequat tetraphenylborate and dibutylphthalate. On a single-line FIA set-up, operating with 1x10-2 mol L-1 ionic strength and 6.3 pH, calibration curves presented slopes of 53.6±0.4mV decade-1 within 5.0x10-6 and1.0x10-3 mol L-1, andsquaredcorrelation coefficients >0.9953. The detection limit was 2.2x10-6 mol L-1 and the repeatability equal to ±0.68mV (0.7%). A dual-channel FIA manifold was therefore constructed, enabling automatic attainment of previous ionic strength andpH conditions and thus eliminating sample preparation steps. Slopes of 45.5±0.2mV decade -1 along a concentration range of 8.0x10-6 to 1.0x10-3 mol L-1 with a repeatability ±0.4mV (0.69%) were obtained. Analyses of real samples were performed, and recovery gave results ranging from 96.6 to 101.1%.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3006
Versão do Editor: http://www.tandfonline.com/doi/abs/10.1080/0306731031000076878#.UpYVnEr6Q25
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