Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Separation and preconcentration by flow injection coupled to tungsten coil electrothermal atomic absorption spectrometry

1996; Elsevier BV; Volume: 51; Issue: 14 Linguagem: Inglês

10.1016/s0584-8547(96)01536-4

1873-3565

Márcia M. Silva, Francisco José Krug, Pedro V. Oliveira, Joaquim A. Nóbrega, Boaventura F. Reis, Daniel A.G. Penteado,

Microfluidic and Capillary Electrophoresis Applications

Abstract A flow injection system coupled to a tungsten coil electrothermal atomizer has been developed for on-line separation and preconcentration, using lead as a model element. The system utilizes three-way solenoid valves for sampling, buffering, washing and reconditioning solution management, and the resin column is inserted in the tip of the autosampler arm of a Varian GTA-96. The solenoid valves and tungsten coil power supply were controlled by a computer program written in Visual Basic, interfaced with the built-in Varian software. The system performance was tested by loading the resin column with the sample flowing at 3 ml min −1 for 60 s. Elution was performed automatically by sampling 20 μl of the eluent from a sample cup of the autosampler, and this aliquot was delivered into a 150 W tungsten coil. With Chelex-100 resin, the separation of concomitants was tested with lead in the presence of as much as 1000 mg l −1 of Ca, Mg, Na or K. The model system presented an enrichment factor of 64 at a sampling rate of 30 samples per hour.