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本文测量了置换反映:RE~(3+)+MgY~(2-)=REY~-+Mg~(2+)和RE~(3+)+MgZ~(3-)=REZ~(2-)+Mg~(2+)在离子强度I=0.10MNaClO_4,298.15K时的焓变(RE=La、Ce、Pr、Nd、Sm、Eu、Gd、Dy、Ho、Yb、Y。Y~(4-)为EDTA酸根,Z~(5-)为DTPA酸根)。借助配离子MgY~(2-)和MgZ~(3-)的生成热文献数据,求得了RE~(3+)—Y~(4-)和RE~(3+)—Z~(5-)的配位热△H,并进一步计算出配离子REY~-和REZ~(2-)的其他生成热力学参数△G和△S。利用内插法粗略地估算了Tb、Er、Tm、Lu四元素相应的热力学量。
In this paper, the displacement of RE ~ (3 +) + MgY ~ (2 -) = REY ~ - + Mg 2+ and RE ~ (3 +) + MgZ ~ (3 -) = REZ ~ ) + The enthalpy change of Mg ~ (2+) at the ionic strength I = 0.10M NaCl1,298.15K (RE = La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Yb, Y. Y ~ 4-) is EDTA root, Z ~ (5-) is DTPA). Based on the generated thermal literature data of complex ions MgY ~ (2-) and MgZ ~ (3-), RE ~ (3 +) - Y ~ (4-) and RE ~ (3 +) - Z ~ ) And the other formation thermodynamic parameters △ G and △ S of REE ~ - and REZ ~ (2-) were further calculated. The thermodynamic quantities of the four elements Tb, Er, Tm and Lu are roughly estimated by interpolation method.