Flow on-line sorption preconcentration in a knotted reactor coupled with electrothermal atomic absorption spectrometry for selective As(III) determination in sea-water samples

被引:27
作者
Herbello-Hermelo, P [1 ]
Barciela-Alonso, MC [1 ]
Bermejo-Barrera, A [1 ]
Bermejo-Barrera, P [1 ]
机构
[1] Univ Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, Spain
关键词
D O I
10.1039/b416772d
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A flow injection on-line sorption preconcentration system using a polytetrafluoroethylene ( PTFE) knotted reactor was coupled with electrothermal atomic absorption spectrometry ( ETAAS) to determine selectively As( III) in sea-water samples. Separation of arsenic inorganic species was achieved by the on-line formation of As( III)-pyrrolidine dithiocarbamate ( PDC) complex in an acid medium, its sorption onto the inner walls of the knotted reactor ( KR) and elution with 40 ml of ethanol. An enhancement factor ( EF) of 44 was obtained compared with the slope of the linear portion of the calibration curve before and after preconcentration The detection limit ( 3 s) was 0.008 mu g l(-1) As( III). The precision ( RSD n = 11) was 4.5% at 0.1 mg l(-1) As( III). The accuracy was demonstrated by total arsenic determination in certificed reference material, NASS-4, after pre-reduction of As( V) with L-cysteine 0.25% ( m/v).
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页码:662 / 664
页数:3
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