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本文首次报导用[2-(4-溴-2-膦酸基苯偶氮)-7-(4′-硝基苯偶氮)1,8-二羟基-3,6-萘二磺酸](简称偶氮溴膦-PN)作为稀土元素的新显色剂,研究了它与稀土元素的显色条件,并将其用于矿石中稀土总量的测定。该试剂为深紫红色粉末,易溶于水,在0.08～0.32N硝酸介质中,它与稀土元素形成蓝紫色络合物,其稳定时间可高达25小时以上。络合物的摩尔吸光系数(以铈计)为7.53×10~4。样品经通常的碱熔,PMBP-苯萃取分离后,即可用它测定稀土总量。
This paper reports for the first time that the use of [2- (4-bromo-2-phosphonophenylazo) -7- (4’-nitrophenylazo) 1,8-dihydroxy- (Brominated bromine-phosphine-PN) as a new chromogenic reagent of rare earth elements, its color conditions with the rare earth elements, and its use for the determination of the total rare earth ores. The reagent is dark purple powder, soluble in water, 0.08 ~ 0.32N nitric acid medium, which forms a purple complex with rare earth elements, the stability time can be as high as 25 hours or more. The molar absorptivity (calculated as cerium) of the complex was 7.53 × 10 ~ 4. Samples by the usual alkali melting, PMBP-benzene extraction separation, you can use it to measure the total amount of rare earth.