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本文研究了在乙醇存在下,各稀土元素与对马尿酸偶氮氯膦(PHA-CPA)和阳离子表面活化剂溴化十六烷基三甲铵(CTMAB)生成三元配合物的显色反应。在0.10～0.50N硫酸介质中,有乙醇存在时,各稀土元素均能与PHA-CPA和CTMAB生成稳定的蓝色配合物,最大吸收波长位于682nm左右。各稀土元素(La～Lu·Y)的三元配合物的摩尔吸光系数为(1.21～1.89)×10~5。在有较大量的EDTA、酒石酸及其它络合剂存在时,亦不影响三元配合物的显色灵敏度和稳定性。这就可利用这些络合剂来掩蔽干扰元素,为测定钢铁中
In this paper, we studied the color reaction of rare earth elements with ternary complexes of PHA-CPA and cetyltrimethylammonium bromide (CTMAB) in the presence of ethanol. In the presence of ethanol in 0.10-0.50 N sulfuric acid medium, each rare earth element can form a stable blue complex with PHA-CPA and CTMAB with the maximum absorption wavelength at about 682 nm. The molar extinction coefficient of the ternary complex of each rare-earth element (La-Lu * Y) is (1.21-1.89) * 10-5. In the presence of larger amounts of EDTA, tartaric acid and other complexing agents, it does not affect the color development sensitivity and stability of the ternary complex. This allows the use of these complexing agents to mask interfering elements for the determination of steel