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对冠醚从盐酸,卤化物和碱溶液中萃取砹(At)的行为进行了研究。无还原剂存在下,~(211)At被冠醚有效萃取,萃取分配比的变化,取决于酸、碱和卤化物的浓度,以及阳离子和卤阴离子的性质。从而对萃取机理作了探计。At在溶液中主要形成络合阴离子AtX_2-(X=CI~-,Br~-,I~-,OH~-),它与适宜的阳离子M~+(M=H~+,K~+,Na~+)配成离子对被冠醚所萃取,这是At被萃取的主要形式,萃取反应简单表示为:M~++C_(有)+AtX_2~-(?)MAtX_2C(有)
The behavior of crown ether extracted from hydrochloric acid, halide and alkali solution ()) was studied. The effective extraction of ~ (211) At by crown ether in the absence of reducing agent depends on the concentration of acid, base and halide, as well as the nature of the cation and halide anions. So as to explore the extraction mechanism. The main complex of AtX_2- (X = CI ~ -, Br ~ -, I ~ -, OH ~ Na ~ +) ion pair is extracted by the crown ether, which is the main form of At extraction, the extraction reaction is simply expressed as: M ~ ++ C_ (yes) + AtX_2 ~ - (?) MAtX_2C