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Resaerch Paper |
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Distribution Of Pb(Ii) Ions Into Chcl3 Solution Of N,N'-Ethylenebis(4-Butanoyl-2,4-Dihydro-5-Methyl-2-Phenyl-3h-Pyrazol-3-Oneimine) As Tris-Complex Species |
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Nigeria |
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Godwin, J || Uzoukwu, B. A |
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10.9790/5736-0131421  |
Abstract: A study of the distribution of Pb(II) from aqueous media into chloroform solution of N,N'-ethylenebis(4-butanoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-oneimine) H2BuEtP and its mixture with (4-butanoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one) HBuP has been carried out. The pH½ of extraction of Pb(II) was slightly lowered from pH 5.88 ± 0.14 to 5.51 ± 0.13 when a mixture of the ligands was used. The physico-chemical properties were determined and the following values were recorded: partition coefficient (log KD) 1.92 ± 0.25 (H2BuEtP) and 1.82 ± 0.22 (H2BuEtP-HBuP); extraction constant (log Kex) -32.90 ± 0.07 (H2BuEtP) and -9.79 ± 0.10 (H2BuEtP-HBuP). Data analysis indicated that Pb(II) complexes distributed more effectively into chloroform solution of H2BuEtP than into a solution of its mixture with HBuP, attributed to Pb(II) being extracted as the ion-pair tris-complex species Pb(BuEtP)(BuEtP)24-.4H+. Protonated Pb(HBuEtP).BuP species were extracted into organic solution mixture of the ligands. Extraction of Pb(II) from mineral acids, show that apart from sulphuric acid extraction is generally very poor, even when a mixture of H2BuEtP and HBuP was used. However a mixture of the ligands is observed to be more effective in the extraction of Pb(II) from solution of anion than when H2BuEtP is used alone. EDTA solution completely masked.the extraction of Pb(II) into organic solutions. Keywords- acids, anions, extraction, lead(II), N,N'-ethylenebis(4-butanoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-oneimine)
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