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偶氮氯膦Ⅲ在PH1～2的酸性介质中与稀土元素形成蓝绿色的络合物,近几年来广泛地用于铸铁、低合金钢中稀土总量的光度测定.但是,铬、镍、铜、钴、钛的干扰较严重,当用于较复杂试样中的稀土总量测定时,仍需采取适当的分离步骤.我们在探讨稀土、偶氮氯膦Ⅲ和各种表面活性物质反应行为的基础上,研究了稀土-偶氮氯膦Ⅲ-溴化十六烷基三甲铵三元络合物体系,显色的适宜酸度是1.5～2.0N盐酸,络合物最大吸收在721～723纳米,由于络合物最大吸收峰的显著红移和反应酸度的提高,使显色反应具有更高的灵敏度和选择性,可不经分离
Chlorophosphonazo Ⅲ forms a blue-green complex with rare earth elements in the acidic medium of PH1 ~ 2, and has been widely used for photometric determination of total rare earths in cast iron and low alloy steel in recent years.However, chromium, nickel, Copper, cobalt and titanium have more serious interference, and when used in the determination of the total amount of rare earth in more complex samples, the appropriate separation steps still need to be taken.We are discussing the reaction of rare earth, chlorophosphonazo Ⅲ and various surface active substances Based on the behavior of rare earth - chlorophosphonazo Ⅲ-cetyl trimethyl ammonium bromide ternary complex system, the appropriate acidity is 1.5 ~ 2.0N hydrochloric acid color, the maximum absorption of the complex in the 721 ~ 723 nm, due to the significant red shift of the maximum absorption peak of the complex and the increase of the reaction acidity, the chromogenic reaction has higher sensitivity and selectivity and can be separated without isolation