钌(Ⅲ )-钼酸盐-乙基罗丹明B-PVA体系缔合显色反应研究  

Study on the Color Reaction of the Ion association Complex of Ruthenium(Ⅲ)-Molybdate Ethylrhodamine B-PVA System

作　　者：李崇宁[1] 李祖碧[1] 徐其亨[2] 阮琼[3] 

机构地区：[1]云南大学成人教育学院,云南昆明650091 [2]云南大学化学系,云南昆明650091 [3]云南师范大学化学系,云南昆明650092

出　　处：《云南大学学报（自然科学版）》2000年第2期134-136,共3页Journal of Yunnan University(Natural Sciences Edition)

摘　　要：在聚乙烯醇 (PVA )存在下 ,钌与钼酸盐和乙基罗丹明B(ERB)形成有色离子缔合物 .最佳反应条件为[HClO4 ]=1.2mol·L-1,[MoO2 -4 ]=6 .8× 10 -4 mol·L-1,[ERB]=3.2× 10 -5mol·L-1,w(PVA ) =0 .0 8% .缔合物的最大吸收位于 5 75nm ,表观摩尔吸光系数ε =2 .32× 10 6L·mol-1·cm-1.钌量在 0～ 2 4μg·L-1范围内服从比耳定律 ,体系至少稳定 2 4h ,检测限 0 .76 μg·L-1(n =12 ) .缔合物的组成比为ERB∶RuMo =3∶1.考察了 41种共存离子的影响 ,仅Si(Ⅳ ) ,Ge(Ⅳ ) ,Os(Ⅷ ) ,Au(Ⅲ )有干扰 .本法已用于某些岩矿和冶金产品中钌的测定 ,结果满意 .Ruthenium with molybdate and ethylrhodamine B to form ionassociation complex in the presence of polyvinyl alcohol(PVA).The optimum conditions are [HClO 4]=1.2?mol·L -1 ,[MoO 2- 4]=6.8×10 -4 ?mol·L -1 ,[ERB]=3.2×10 -5 ?mol·L -1 and 0.08% PVA.The maximum absorption of the ion association complex is at 575?nm.Its apparent molar absorptive coefficient is 2.32×10 6 L·mol -1 ·cm -1 ,and it is stable for at least 24?h.Beer's law is obeyed in the range of 0～24?μg·L -1 for ruthenium.The limit of detection is 0.76?μg·L -1 ( n =12).The molar ratio of the main components in the ion association was found to be ERB∶RuMo=3∶1.Tolerance limits for 41 various ions were tested.Large amounts of other common metals were tolerated.The method was used for determination of ruthenium in some ores and metallurgical products with satisfactory results.

关 键 词：钌 钼酸盐 乙基罗丹明B 光度法 PVA 显色反应 

分 类 号：O614.821[理学—无机化学] O657.31[理学—化学]