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测定轻稀土的偶氮氯膦-pN直接光度法,具有干扰少、灵敏度较高及可在钇存在下测定轻稀土等优点。本文仅就该法应用于钢铁及精密合金分析中的某些问题进行讨沦。一试剂偏磷酸钠溶液:15%,取7.5克偏磷酸钠加50毫升水,放置使其溶解。其余试剂同资料二试验方法基本同资料,但改为高氯酸(70%)2毫升处理试样(即显色液中含高氯酸(2N)1.0毫升),这样对于0.2克试样的冒烟处理也不会带来困难;另外,采用偏磷酸钠退色作参比液。三方法讨论 1 关于参比液问题偏磷酸钠(或六偏磷酸钠)曾用于许多测定稀土的
Determination of light rare earth chlorophosphonazo-pN direct spectrophotometry, with less interference, high sensitivity and can be measured in the presence of light rare earth advantages. This article discusses only some of the problems that this method applies to steel and precision alloy analysis. A reagent sodium metaphosphate solution: 15%, take 7.5 grams of sodium metaphosphate and 50 ml of water, allowed to dissolve. The remaining reagents with the second test method is basically the same data, but replaced by perchloric acid (70%) 2 ml of the sample (ie chromogenic solution containing perchloric acid (2N) 1.0 ml), so that 0.2 g of sample Smoke treatment will not bring difficulties; In addition, the use of sodium metaphosphate fading reference solution. Three methods to discuss 1 About the reference solution Problem Sodium metaphosphate (or sodium hexametaphosphate) has been used in many determination of rare earth