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用偶氮氯膦-mA光度法测定钢中希土总量已有报道(本刊(6)封二(1979)]。我们在实际的分析中,发现钛有明显的干扰,给希土的分析结果带来正偏差。为此我们做了排除钛干扰的实验。一基本操作称取样品0.1克于50毫升钢铁量瓶中,加硝酸(1+5)10毫升温热溶解,煮沸赶尽氨氧化物后冷却(如试液混浊需过滤),稀至刻度。显色液:吸取母液10毫升于25毫升量瓶中(样品含钛时加30%过氧化氢1～2滴),加草酸(5%)7毫升,偶氮氯膦-mA(0.02%)5毫升,以水稀到刻度,
The determination of the total amount of rare earth in steel by the chlorophosphonazo-mA spectrophotometry has been reported (Journal (6) (2) (1979).) In the actual analysis, we found that titanium has obvious interference, Analysis of the results bring positive deviation .To do we have to exclude titanium interference experiment.A basic operation Weigh the sample 0.1 g in 50 ml steel flask, add nitric acid (1 +5) 10 ml warm dissolve, boil away Ammonia oxide after cooling (such as test fluid turbidity to be filtered), dilute to the mark Color solution: Pipette 10 ml in 25 ml volumetric flask (sample containing titanium plus 30% hydrogen peroxide 1 to 2 drops), plus Oxalic acid (5%) 7 ml, chlorophosphonazo-mA (0.02%) 5 ml, diluted with water to the mark,