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本文报道了 Tb(Ⅳ)的碱式碳酸盐可溶解在苹果酸的水溶液中形成红棕色络合物,该络合物在360—400nm 附近有一宽带特征吸收峰,消光值在0—0.7范围内与 Tb(Ⅳ)的浓度呈直线关系.用分光光度法对 Tb(Ⅳ)自还原反应的研究确定,在288K 及苹果酸浓度为1.00M 时,随 PH 值增大速度常数减小,其半还原期增长.该反应的反应级数为一,反应的表观活化能平均值为46.3KJ·摩~(-1).
The paper reports that the basic carbonate of Tb (Ⅳ) is soluble in the aqueous solution of malic acid to form a reddish brown complex. The complex has a broad band characteristic absorption peak near 360-400nm. The extinction value is in the range of 0-0.7 The linear relationship between Tb (Ⅳ) concentration and Tb (Ⅳ) concentration was determined by spectrophotometry, and the self-reduction reaction of Tb (Ⅳ) was determined at 288K and malic acid concentration of 1.00M, The half-reduction period increased.The reaction order was one, and the average apparent activation energy of the reaction was 46.3 KJ · mol -1.