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偶氮氯磷-pN[2-(4-氯-2-膦酸基苯偶氮)-7-(4-硝基苯偶氯)-1.8-二羟基-3.6-萘二磺酸](CPA-pN)在酸性溶液中与钇形成蓝绿色的β型络合物,其最大吸收峰在730nm处,而在此波长处其他轻重稀土元素或无明显吸收或吸收很少,故可用于单独测定钇。此反应已被应用于镍基合金中测定钇,但反应的适宜条件在不同的报道中存在较大差异,且当轻稀土元素与钇的含量相当时,轻稀土元素的干扰尚无较简便的分离或掩蔽方法。为此,本文着重对CPA-pN与钇的β型显色反应的条件以及钇与轻稀上元素的分离作了进一步的试验,并在此基础上提出了镍铬合金和铬铁铝舍金中钇的测定方法。
Chlorophosphonazo-pN [2- (4-chloro-2-phosphonophenylazo) -7- (4-nitrobenzene chloro) -1.8-dihydroxy-3,6-naphthalenedisulfonic acid] (CPA -pN) form a greenish-blue beta-type complex with yttrium in acidic solution with a maximum absorption peak at 730 nm where other light or heavy rare earth elements are either absent or appreciably absorbed or absorbed and are therefore useful for individual assays yttrium. The reaction has been applied to the determination of yttrium in nickel-based alloys, but the suitable conditions for the reaction vary greatly in different reports. When the contents of light rare earth elements and yttrium are quite similar, the light rare earth elements interference is not simple Separation or masking method. Therefore, this article focuses on the conditions for the color reaction of β-type of CPA-pN with yttrium and the further separation of yttrium and light-rare-earth elements. On this basis, Yttrium in the determination of the method.