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乙醚萃取法制光谱纯铈的原理是,将铈氧化成四价后,它的性质与其他三价希土差别更大,以此作为分离的基础。四价铈在强的硝酸液中(如8N 硝酸)由于形成[Ce(NO_3)_6]=络离子而为乙醚萃取,可能因为乙醚是含氧溶剂,其 H_2[Ce(NO_3)_6]络合物中的氢很易与乙醚构成[C_2H_5OC_2H_5H]~+形式的所谓“(钅羊)”离子。因此,萃取机构可以大致认为是形成(钅羊)盐[RORH]X~-而被萃取的。把硝酸铈铵(A.R.)溶于8N 硝酸中,此时铈已为四价,故不必再行氧化,以此溶液与乙醚等体积地萃取,然后用8N 硝酸洗乙醚相两次,使不纯物更好地从有机相中分离出去,然后以3%左右的过氧化氢溶液与乙醚(有
Diethyl ether extraction of the principle of pure cerium spectroscopy is that the oxidation of cerium to tetravalent, its nature and other trivalent difference between the greater the soil, as the basis for separation. The tetravalent cerium is extracted by diethyl ether in strong nitric acid solution (such as 8N nitric acid) due to the formation of [Ce (NO_3) _6] = complex ions, probably due to the complexation of H_2 [Ce (NO_3) _6] The hydrogen in the matter easily forms so-called “goat” ions of the form [C_2H_5OC_2H_5H] ~ + with ether. Therefore, the extraction mechanism can be roughly considered as forming (ramie) salt [RORH] X ~ - to be extracted. The cerium ammonium nitrate (AR) was dissolved in 8N nitric acid, cerium has been tetravalent at this time, so do not have to re-oxidation, the solution and ether and other volume extraction, and then washed with 8N nitric acid ether twice, so impure The material is better separated from the organic phase, and then about 3% hydrogen peroxide solution with ether (with