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[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)]为稀土元素的新型显色剂,笔者已将其用于地质样品中稀土总量的测定。本文采用草酸和焦磷酸钠抑制钇组
[2- (4-bromo-2-phosphonophenylazo) -7- (4’-nitrophenylazo) -1.8-dihydroxy-3.6-naphthalenedisulfonic acid )] Is a new type of rare earth element developer, I have used it for the determination of the total amount of rare earths in geological samples. In this paper, oxalic acid and sodium pyrophosphate inhibition yttrium group