Electrochemical investigation of heavy metal ion transfer across the water/1,2-dichloroethane interface assisted by 9-ethyl-3-carbazolecarboxaldehyde-thiosemicarbazone
Küçük Resim Yok
Tarih
2007
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
WILEY-V C H VERLAG GMBH
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The transfer of heavy metal ions across the polarized water/1,2-dichloroethane (1,2-DCE) interface assisted by 9ethyl-3-carbazolecarboxaldehyde-thiosemicarbazone (ECCAT) in the 1,2-DCE phase has been studied by cyclic voltammetry. Voltammetric waves of Pb(II) and Cd(II) ions were reversible and quasi-reversible, respectively, whereas that of Hg(II) and Zn(II) ion were irreversible. The voltammogram of Cu(II) ion showed a two-step wave, however the nature of the transfer could not be satisfactorily evaluated by analyzing the cyclic voltammetric data. When Ni(II) and Co(II) was used no peak was visible under the experimental conditions used in this study. The dependence of the half-wave potentials of Pb(II) and Cd(II) ions on the ligand concentration reveals that their ion-transfer is assisted by the formation of 1:3 metal-ECCAT complex in 1,2-DCE. The over-all association constants of [Pb(ECCAT)(3)](2+) and [Cd(ECCAT)(3)](2+) complexes in DCE-phase have been determined to be log beta(3)(0)= 14.03 and log beta(0)(3) = 15.44, respectively.
Açıklama
Anahtar Kelimeler
ITIES, assisted ion transfer, cyclic voltammetry, stoichiometry, association constant
Kaynak
ELECTROANALYSIS
WoS Q Değeri
Q1
Scopus Q Değeri
Q2
Cilt
19
Sayı
12
