EFFECT OF SULPHATE AND NITRATE ION ON THE EXTRACTION OF COPPER (II) METAL IONS FROM AQUEOUS MEDIA USING 2,2,2-TRICHLORO-1-(5-HYDROXY-3-METHYL-1-PHENYL-1H-PYRAZOL-4-YL)ETHANONE IN CHLOROFORM

Abstract

The effect of sulphate and nitrate ions in aqueous media on the extraction of Cu (II) ions into 2,2,2-trichloro-1-(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)ethanone (HTcP) solution in chloroform has been studied. The synergistic effect of butanol on the extraction of the metal ion was also examined. The results showed that extraction of Cu(II) ions was found to be more efficient from solutions of 0.05M HTcP between pH 4.00 – 8.00 over the pH range of 1.00 -8.00 studied with optimum percentage extraction above 90%. Increase in sulphate ion concentrations from 0.01M to 1.00M in the aqueous media resulted to a decrease in Cu (II) ion extracted and a shift of the extraction processes to higher pH values. This is due to the masking of the metal by anionic sulphate-copper complexes formed in solution. Similarly, increase in nitrate ion concentrations from 0.01M to 1.00M followed the same trend with optimum percentage extraction (%E) above 70%. Slight synergism occurred in the distribution of the metal ion into the chloroform-butanol phase and the extraction data showed that pH1/2 shifted to lower values. Addition of butanol into the organic phase resulted in slight increase of optimum percentage extraction up to 99.57% from 99.15% in the absence of butanol as synergist over the pH range of 3.52-8.00 from aqueous buffer media containing 0.1M concentration of SO42- ion. The slope analysis indicated that the Cu(TcP)2 adduct complex species were extracted during all the extraction processes. The pH1/2 and %E of the extraction systems were determined and used for explaining the various extraction processes observed. Keywords: Sulphate ion, Nitrate ion, aqueous media, copper (II), 2,2,2-trichloro-1-(5-hydroxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)ethanone.