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本文应用2-(2,6-二溴-4-硝基苯偶氮)-7-(2′-膦酸基-4′-氯苯偶氮)-1,8-二羟基萘-3,6-二磺酸(以下简写作DBNCPA)及偶氮氯膦Ⅰ(简写作CPA-Ⅰ)分别作为稀土和镁的显色剂并提出了钢铁中稀土和镁联合测定的新方法。 DBNCPA是最近报道的一种新的稀土显色剂,它的特点是能在mol·L~(-1)级的多种酸介质中显色,酸度范围也较宽,而且选择性好,灵敏度高。铈组稀土元素配合物的摩尔吸光系数达(La～Nd)1.07～1.09×10~5L·mol~(-1)·cm~(-1),在不加草酸作掩蔽剂的情况下,重
In this paper, 2- (2,6-dibromo-4-nitrophenylazo) -7- (2’-phosphono-4’-chlorophenylazo) -1,8-dihydroxynaphthalene- Disulfonic acid (abbreviated as DBNCPA) and chlorophosphonazo Ⅰ (abbreviation CPA-Ⅰ) were respectively used as chromogenic agents for rare earth and magnesium, and a new method for determination of rare earth and magnesium in steel was proposed. DBNCPA is a new rare earth color reagent recently reported. It is characterized by being able to develop color in a variety of acid media of mol·L -1 level, wide range of acidity, good selectivity and sensitivity high. The molar absorptivities of the rare earth elements in the cerium group were (La ~ Nd) 1.07 ~ 1.09 × 10 ~ 5L · mol ~ (-1) · cm -1. Without adding oxalic acid as the masking agent,