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The study focused on the solvent extraction of Cr(III) from sulfate media using Cyanex 302 (bis (2,4,4-trimethylpentyl) monothio-phosphinic acid). Various parameters were systematically evaluated, including phase contact time, initial pH, metal ion concentration, extractant concentration, sulfate ion concentration, temperature, and the type of diluent. Equilibrium was reached within 30 minutes, with the highest extraction efficiency occurring at pH 5.0. Adding more Cyanex 302 improved the extraction efficiency. The study showed that each Cr(III) ion paired with a single dimeric extractant molecule. The presence of sulfate ions was found to hinder extraction by forming non-extractable chromium complexes. The extraction process was endothermic, as indicated by positive enthalpy changes. Among the diluents tested, toluene showed the highest extraction efficiency; however, kerosene was chosen for practical reasons. The maximum loading capacity of Cyanex 302 for Cr(III) was determined to be 2.742 g per 100 g of the extractant. Research found that sulfuric acid was good for stripping, but HCl and HNO3 did not work in the conditions tested. Cyanex 302 had a medium level of extraction efficiency compared to other extractants. These results suggest that Cyanex 302 holds promise for industrial applications in Cr recovery processes, although further optimization may be required to enhance its effectiveness.

As Bangladesh is enriched with fish resources of fresh water, few studies have been conducted to reveal the nutritional value of fish oils. In our present work, we aimed to study the composition of extracted lipids from Colisa fasciatus to explore the medicinal value of this fish which can be used as a precursor for nutraceuticals also. The lipid was extracted from the fish using a solvent extraction method with chloroform and methanol. The qualitative parameters like acid value, peroxide value, saponification value and iodine value were calculated by chemical reaction methods. GCMS analysis was carried out to explore the composition of the extracted lipid. The antioxidant activity of the extracted lipid was carried out by DPPH radical scavenging and Iron reducing study. Thrombolytic activity of the sample was studied by weight difference method. Among 20 constituents hexadecanoic acid (42.808%) was present in the highest concentration. The other remarkable components are Methyl tetradecanoate, pentadecanoic acid, heptadecanoic acid and 9-Octadecanoic acid. Compared to butylated hydroxyl toluene (BHT) as standard, our extracted fish lipid showed 27.9% removal of DPPH. The thrombolytic property showed 7.07 % lysis of blood clots. The fatty acid composition of the extracted lipid supports physiological properties like antiaging and thrombolysis which can make a way to find a new array to use this fish lipid as a new nutritional supplement.