分光光度法测定磷肥中稀土总量  

Absorption Photometry Determination Total Rare Earth in Phosphate Fertilizer

作　　者：杜芳艳[1] 

机构地区：[1]榆林学院化学与化学工程学院,榆林719000

出　　处：《科学技术与工程》2007年第8期1720-1722,共3页Science Technology and Engineering

摘　　要：在pH7.0的Tris-HCl缓冲溶液中,RE(Ⅲ)与3-噻唑偶氮-5-氨基苯酚形成稳定的1∶3型红色络合物,最大吸收波长为λmax=523nm,RE(Ⅲ)含量在(0.07～1.5)mg.L-1范围内服从比耳定律。据此建立了光度法测定微肥中稀土总量的方法。对三种磷肥样品实测结果表明,该法较简便,灵敏度高,选择性较好。In the Tris-HCl buffer solution of pH7.0, rare earth reacts with 3-thiazodyzo-5-amino phenol （3- TAP） to form a stable 1：3 red colour complex having its maximum absorption at 525.3 nm, Beer＇ s law is obeyed in the range of （0.07 -1.51） mg·L^-1 for RE（Ⅲ）. The total rare earth in phosphate fertilizer can be precisely determined by the spectrophotometer, three phosphate fertilizer samples were analyzed by this method and results are good agreement with AAS. The experimental results showed that this method had the characteristics of high sensitivity excellent selectivity and convenience.

关 键 词：分光光度法 3-噻唑偶氮-5-氨基苯酚(3-TAP) 稀土 磷肥 

分 类 号：O657.32[理学—分析化学]