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D2EHPA 및 Dithizone에 의한 납의 추출평형
Equilibrium in the Extraction of Pb(II)by D2EHPA and Dithizone
HWAHAK KONGHAK, June 1990, 28(3), 264-270(7), NONE
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Abstract
납 수용액으로부터 di(2-ethylhexyl) phosphoric acid(D2EHPA)-carbon tetrachloride와 di-phenylthiocarbazone(dithizone)-chloroform을 사용한 추출평형을 측정하였다. D2EHPA일 때 적용 한계 부하비 0.05이하에서 추출화학종은 PbR2(RH)2이고 평형상수는 3.0×10-3이었으며, 추출제 di-thizone일 때 적용한계 부하비 0.03 이하에서 추출화학종은 Pb(Dz)2이고 평형상수는 1.2×10-1이었다. 한계 부하비를 넘으면 추출화학종과 평형상수는 D2EHPA일 때 (PbR2)n(RH)2, 6×10-3이고 dithizone일 때[Pb(Dz)2]n, 2.2[m3/mol]로 각각 변하였다. 식초산 완충용액을 수용액상에서 가하면 추출상수는 다소 감소하였고 유기상에 계면활성제 Span#80을 첨가하면 평형상수는 약간 증가하였다.
Measurements of the extraction equilibrium of lead acetate aqueous solution with di(2-ethylhexyl)phosphoric acid(D2EHPA)in carbon terachloride, and diphenylthiocarbazone (dithizone)in choloroform were carried out at 25℃. Over the range of loading ratios less then 0.05for 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 D2EHPA 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[m3/mol] for dithizone. The equi-librium constants were found to decrease upon adding of acetic buffers, and to a little increase by addition of Span#80.
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