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
论文数: 0引用数: 0
h-index: 0
机构:
Univ Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, SpainUniv Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, Spain
Herbello-Hermelo, P
[1
]
Barciela-Alonso, MC
论文数: 0引用数: 0
h-index: 0
机构:
Univ Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, SpainUniv Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, Spain
Barciela-Alonso, MC
[1
]
Bermejo-Barrera, A
论文数: 0引用数: 0
h-index: 0
机构:
Univ Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, SpainUniv Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, Spain
Bermejo-Barrera, A
[1
]
Bermejo-Barrera, P
论文数: 0引用数: 0
h-index: 0
机构:
Univ Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, SpainUniv Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, Spain
Bermejo-Barrera, P
[1
]
机构:
[1] Univ Santiago de Compostela, Fac Chem, Dept Analyt Chem Nutr & Bromatol, E-15782 Santiago De Compostela, Spain
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).