HIGHLY SENSITIVE SPECTROPHOTOMETRY OF NIOBIUM  

作　　者：Zong Ming LUO Department of Chemical Engineering,Guangdong Institute of Technology,Guangzhou,510090 

出　　处：《Chinese Chemical Letters》1990年第2期131-132,共2页中国化学快报（英文版）

摘　　要：In pH 2.0-3.0 medium,niobium(v)forms molybdoniobic acid with sodium molybdate.A spectrophotometric method has been developed for the determination of niobium based on the formation of ion-associate compound of molybdoniobate with butyl Rhodamine B in aqueous solution in the presence of polyvinyl alcohol and 0.4-0.7 mol/L H_2SO_4.The molar absorptivity is 7.5×10~5 L.mol^(-1).cm^(-1) for niobium at 585 nm.In pH 2.0-3.0 medium,niobium(v)forms molybdoniobic acid with sodium molybdate.A spectrophotometric method has been developed for the determination of niobium based on the formation of ion-associate compound of molybdoniobate with butyl Rhodamine B in aqueous solution in the presence of polyvinyl alcohol and 0.4-0.7 mol/L H_2SO_4.The molar absorptivity is 7.5×10~5 L.mol^(-1).cm^(-1) for niobium at 585 nm.

关 键 词：ACID HIGHLY SENSITIVE SPECTROPHOTOMETRY OF NIOBIUM IV 

分 类 号：O6[理学—化学]