The interaction of reagent grade strontium sulphate and celestine concentrate with aqueous solutions of oxalic acid, sodium oxalate and ammonium oxalate for the production of strontium carbonate were investigated for different oxalate compound:SrSO4 mole ratios and reaction times using x-ray diffraction analysis and dissolution tests. Under the same experimental conditions, it was found that aq...

Trichromatic colorimetry was applied for the evaluation of the colour changes of the metallochromic indicators, viz., hematoxylin, gallocyanine, Gallamine Blue, Solochrome Prune AS, Celestine Blue, Eriochrome Black T, Xylenol Orange and Catechol Violet, in the complexometric titration of zirconium( IV) with ethylenediaminetetraacetic acid (EDTA) to measure the quality of colour change at the eq...

The Montevive celestine mineral deposit, set in the Granada Basin a marine evaporitic uppermost Tortonian–lowermost Messinian sequence, is largest reserve Europe of this economically important strontium ore. Currently, mine has large amount tailings resulting from rejection manual dry screening high-grade mineral. This visual and density was carried out early days mining (1954–1973). Concentrat...

Three simple spectrophotometric methods have been described for the assay of olanzapine in its pure and pharmaceutical formulations. The direct method (A) is based on the drug oxidation with excess of N-bromosuccinimide in acidic medium and the two indirect methods (B and C) are based on the oxidation of the drug with excess of N-bromosuccinimide and cerium(IV)sulfate, followed by the reaction ...