| Autor: |
Thomas C. Franklin, William K. Adeniyi |
| Rok vydání: |
1988 |
| Předmět: |
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| Zdroj: |
Analytica Chimica Acta. 207:311-317 |
| ISSN: |
0003-2670 |
| DOI: |
10.1016/s0003-2670(00)80807-7 |
| Popis: |
Addition of a cationic surfactant (Hyamine-2389) solubilized iron pyrite powder and increased the oxidation potential of water to a value that allowed anodic voltammetric measurements to be made directly on the powders. An oxidation maximum (at 0.69 V vs. SCE) at pH 12.8 is associated with oxidation of FeS2 to Fe2O3. Because adsorption of the pyrite on the electrode provides preconcentration, the peak height is very sensitive to concentration. Measurements above the critical micelle concentration (CMC) were complicated because peak height was not a simple function of pyrite concentration and the calibration curve was shifted by the presence of an insoluble inert material. However, at concentrations of surfactant below the CMC, a relatively linear relation was observed between peak height and the amount of pyrite; thus the technique can be used to determine the iron pyrite in solid ore samples. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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