| Popis: |
The technique of column cementation on aluminium metal powder for preconcentration from soution of copper, lead, ruthenium and the noble metals is shown to be quantitative over a wide range of concentrations. Optimum conditions of pH, temperature and solution flow rate are established. In conjunction with final measurements by spark-source mass spectrometry of the aluminium powder concentrate, detection limits are below 1 μg l−1 and concentration factors of >1000-fold are readily obtainable. Interference effects are discussed; the principal interference, that of iron, can be masked with fluoride. |
