【摘要】 在ｐＨ＝９３的１６×１０－２ｍｏｌ／Ｌ硼砂、３６×１０－２ｍｏｌ／Ｌ氨水和１６×１０－５ｍｏｌ／Ｌ百里香酚酞络合剂底液中，稀土百里香酚酞络合剂有一灵敏的极谱波，其二次导数波峰电位为－１０２Ｖ（Ｓ．Ｃ．Ｅ）。波高与稀土离子浓度（４０×１０－７～３６×１０－６ｍｏｌ／Ｌ）有良好的线性关系。考察了影响极谱波的各种因素和共存离子的干扰，将此极谱波应用于钢中轻稀土的测定，结果准确。更多还原

【Abstract】 A new polarographic system for determination of rare earths (RE) has been presented. A solution consisting of 1610-2 mol/L of Na2B4O7, 3610-2 mol/L of NH3H2O and 1610-5 mol/L of thymolphthalexon (TP) is used as supporting electrolyte. The electric potential of secondary derivative wave peak of the supporting electrolyte is -102 V (S.C.E). The supporting electrolyte has an electric potential of -102 V at its secondary derivative wave peak. The wave length has a good linear relationship with the iron concentration of RE in the range 4010-7 to 3610-6 mol/L various factors affecting the polarographic wave and interference with coexistance irons are investigated. The method has been successfully applied in determination of light rare earths in steel.更多还原