期刊名称：Pakistan Journal of Analytical & Environmental Chemistry
印刷版ISSN：1996-918X
电子版ISSN：2221-5255
出版年度：2008
卷号：9
期号：1
页码：1-5
语种：English
出版社：National Centre of Excellence in Analytical Chemsitry
摘要：Extraction of Co(II) in the presence of Mn(II),Ni(II) and Cu(II) has been studied using the mixture of 2-propanol with water upon the addition of CaCl2 in the concentration range of 3.0 ñ 5.0 mol dm -3 (M). Co(II) was extracted selectively to the extent of 80% into the 2-propanol phase at 5.0 M CaCl2. The percent of extraction of other transition metal ions,for example Mn(II),Ni(II) and Cu(II) was much lower than that of Co(II),but they were stripped in the aqueous phase upon addition of CaCl2. Therefore,selective extraction of Co(II) from these metal ions was attained by using the mixture of water and 2-propanol. Co(II) was extracted as CoCl4 2- from the aqueous phase into the 2-propanol phase through the formation of ion pair,Ca 2+ - CoCl4 2-. A mechanism is proposed to explain the extraction..
