Reproducibility and repeatability in tensiometry
DOI:
https://doi.org/10.5902/2179460X85536Keywords:
Critical micelle concentration, Ring tensiometer, Tensiometry, Vegetable oils, Statistical analysisAbstract
Flotation is a physical-chemical process in which there is selective hydrophobization of particles and subsequent capture of these hydrophobic particles by bubbles. Critical micelle concentration (cmc) is an important parameter in this process, as its value supports the selection of the appropriate concentration of reagents. One of the apparatuses for such measurement is the Du Noüy ring tensiometer. In this work, the repeatability and statistical reproducibility (R&R) parameter for tensiometry of saponified solutions of vegetable oils used as anionic collectors in mineral flotation was analyzed. The mean value-amplitude method was used, with two operators and three oils studied. The cmc results for both operators showed very close values, with mango and palm oils showing approximately 35 mN/m, while copaiba oil resulted in an approximate cmc value of 46 mN/m. These values resulted in an R&R% of 5.07 % and number of distinct categories (ndc) of 27.8, indicating reliability in the measurements. Given the simplicity of the method, it can be directed towards a wide range of studies.
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