D2EHPA 및 Dithizone 에 의한 납의 추출평형 = Equilibrium in the Extraction of Pb ( 2 ) by D2 EHPA and Dithizone

다국어 초록 (Multilingual Abstract)

Measurements of the extraction equilibrium of lead acetate aqueous solution with di(2-ethylhexyl) phosphoric acid (D₂EHPA) in carbon tetrachloride, and diphenylthiocarbazone (dithizone) in chloroform were carried out at 25℃. Over the range of loading ratios less then 0.05 for D₂EHPA and 0.03 for dithizone, the extracted organic metal species and equilibrium constants were found to PbR₂(RH)₂. 3.0×10^(-3) for D₂ZEHPA and to Pb(Dz)₂. 1.2×10^(-1) for dithizone. Upon increasing the loading ratio above the threshold value, the extracted chemical species and equilibrium constants were estimated to (PbR₂)_n(RH)₂. 6×10^(-3) for D₂EHPA, and to [Pb(Dz)₂]_n, 2.2[㎥/㏖] for dithizone. The equilibrium constants were found to decrease upon adding of acetic buffers, and to a little increase by addition of Span#80.