| Autor: |
*, Ricardo Jorgensen Cassella, , Bitencourt, Denise Teixeira, Branco, Aline Garcia, Ferreira, Sérgio Luis Costa, Jesus, Djane Santiago de, Carvalho, Marcelo Souza de, Santelli, Ricardo Erthal |
| Zdroj: |
JAAS (Journal of Analytical Atomic Spectrometry); November 1999, Vol. 14 Issue: 11 p1749-1753, 5p |
| Abstrakt: |
An online procedure for the preconcentration and determination of zinc in waters and biological materials was developed. Zinc is preconcentrated from acidic medium (pH 3.0) as its thiocyanate complex onto a polyurethane foam minicolumn placed in the loop of a fourway valve. The elution step is performed with a stream of 30% acetone in 2% HNO3 and the zinc displaced is introduced directly into the nebuliser of a flame atomic absorption spectrometer. The system was operated under two different preconcentration times since the concentration of zinc in the two types of samples was different. For biological samples, 1 min was used and a detection limit of 3.0 µg L−1 was achieved with a throughput of 40 samples per hour. At a concentration of 20 µg L−1, an RSD of 2.5% was obtained. For the determination of zinc in natural water, a preconcentration time of 3 min was employed and a detection limit of 0.85 µg L−1 was obtained. In this case, the system was slower with a throughput of 17 samples per hour. The RSD at 10 µg L−1 was 6.0%. The continuous flow system was applied to the analysis of several biological reference materials and natural water samples. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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