【摘要】 用pH电位法研究了酸性媒介黄R（C.I.18821 Acid Mrdant Yellow 8）与三价稀土离子（La,Pr,Eu）的络合行为。测得30℃时,在0.1mol^-1KCl,10%二氧杂环己烷体系中该偶氮染料的酸离解常数K₂^H及K₃^H,稀土离子与染料的酸式络合物稳定常数β_M^M（HL）及β_M^M（HL）2,酸式络合物的酸离解常数K_{M（HL）（?）}^H及K_M（HL）L^H和络合常数K_M（HL）^M（HL）L及β_M^ML2。讨论了各络合物的配位形式和稀土离子在染色过程中的作用。更多还原

【Abstract】 The coordination behavior of acid mordant yelllow 8 with La（III）, Pr（III） andEu（III） has been studied using pH electro-potential method. The acid dissociationconstants of the diazo-dye K₂^H, K₃^H, the acid dissociation constants of the protonatedcomplexes K_M（HL）2^H,K_H（HL）L, the stability constants of the protonated complex ofthe rare-earth ions and the dye β_M^M（HL）, β_M^M（HL）₂), and the complexing constants K₍M（HL）⁽M（HL）L,β_M^ML2 has been determined at 30℃ a in a solution of 0.1 mol·L^-1 KCl and 10% （volumeper centage） dioxane. The coordination pattern of the complexes and the role ofrare-earth ions in the dyeing process have been discussed.更多还原