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Titolo:
Flame atomic absorption spectrometry with flow-injection on-line adsorption preconcentration using a knotted reactor for cadmium determination in aqueous samples
Autore:
Garrido, I; Soto, RM; Carlosena, A; Lopez-Mahia, P; Muniategui, S; Prada, D;
Indirizzi:
Univ A Coruna, Dept Analyt Chem, Fac Sci, La Coruna 15071, Spain Univ A Coruna La Coruna Spain 15071 hem, Fac Sci, La Coruna 15071, Spain
Titolo Testata:
ANALYTICAL LETTERS
fascicolo: 10, volume: 34, anno: 2001,
pagine: 1763 - 1779
SICI:
0003-2719(2001)34:10<1763:FAASWF>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
ONLINE SORPTION PRECONCENTRATION; HIGH-PURITY REAGENTS; WATER SAMPLES; COPRECIPITATION PRECONCENTRATION; COLUMN PRECONCENTRATION; ENVIRONMENTAL-SAMPLES; BIOLOGICAL SAMPLES; SORBENT EXTRACTION; SOLVENT-EXTRACTION; ULTRATRACE AMOUNTS;
Keywords:
cadmium; flow injection; on-line adsorption preconcentration; knotted reactor; FAAS; rain waters; sea waters;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Soto, RM Univ A Coruna, Dept Analyt Chem, Fac Sci, Zapateira S-N, La Coruna 15071, Spain Univ A Coruna Zapateira S-N La Coruna Spain 15071 a 15071, Spain
Citazione:
I. Garrido et al., "Flame atomic absorption spectrometry with flow-injection on-line adsorption preconcentration using a knotted reactor for cadmium determination in aqueous samples", ANAL LETTER, 34(10), 2001, pp. 1763-1779

Abstract

A knotted reactor flow injection on-line preconcentration system coupled to a flame atomic absorption spectrometer (FAAS) was developed for the direct determination of cadmium in aqueous samples. Diethyldithiocarbamate was used to complex the analyte and then, it was adsorbed on the walls of a knotted reactor (KR) made from PTFE tubing. All the FI and chemical variables were optimized. The complex elution was performed on-line using ethanol. Thesample loading time and flow rate were set at 60 s and 6 mL/min, respectively. An enhancement factor of 33 was achieved, resulting in a sampling frequency (h(-1)) of 30. The limit of detection was 3.44 mug/L. The accuracy ofthe method was tested by the analysis of three certified reference materials (Certified Aqueous Standard 7878, Reference Water TM-24 and Trace Elements in Water 1643d). The results obtained are within the certified ranges ata 95% confidence level and a good precision was also achieved (<2.7%, n=6). The proposed procedure was applied to the Cd determination in rain and sea water samples.

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Documento generato il 25/05/20 alle ore 04:53:32