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Determination of ultra trace amounts of bismuth in biological and water samples by electrothermal atomic absorption spectrometry (ET-AAS) after cloud point extraction
A new approach for a cloud point extraction electrothermal atomic absorption spectrometric method was used for determining bismuth. The aqueous analyte was acidified with sulfuric acid (pH 3.0–3.5). Triton X-114 was added as a surfactant and dithizone was used as a complexing agent. After phase sepa...
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| Published in: | Analytica chimica acta 2005-04, Vol.534 (1), p.163-169 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | A new approach for a cloud point extraction electrothermal atomic absorption spectrometric method was used for determining bismuth. The aqueous analyte was acidified with sulfuric acid (pH 3.0–3.5). Triton X-114 was added as a surfactant and dithizone was used as a complexing agent.
After phase separation at 50
°C based on the cloud point separation of the mixture, the surfactant-rich phase was diluted using tetrahydrofuran (THF). Twenty microliters of the enriched solution and 10
μl of 0.1% (w/v) Pd(NO
3)
2 as chemical modifier were dispersed into the graphite tube and the analyte determined by electrothermal atomic absorption spectrometry. After optimizing extraction conditions and instrumental parameters, a preconcentration factor of 196 was obtained for a sample of only 10
ml. The detection limit was 0.02
ng
ml
−1 and the analytical curve was linear for the concentration range of 0.04–0.60
ng
ml
−1. Relative standard deviations were |
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| ISSN: | 0003-2670 1873-4324 |
| DOI: | 10.1016/j.aca.2004.06.036 |