重稀土β型络合物共显色反应研究及其应用对硝基偶氮氯膦光度法测定矿石中重稀土

Investigations and Analytical Applications of the Co-coloration of β-type Complexes of Yttrium Sub-group Rare Earths with p-nitrochlorophosphonazo. Spectrophotometric Determination of Yttrium Sub-group Rare Earths

本文研究了对硝基偶氮氟膦与稀土元素的α型络合物以及与钇共存时β型络合物的形成条件、络合物组成及共存离子的干扰情况。方法用于测定矿石中的重稀土,结果令人满意。

Yttrium reacts with the title reagent forming β-type complexes, and also yttrium subgroup rare earths behave the same in the presence of yttrium. The complexes form quantitatively within 10 min in perchloric acid medium. Under the conditions employed, the molar absorptivities at 735 nm are within 6.2-9.3×10~4 L.mol^(-1).cm^(-1). Beer's law is obered for 8-28μg of yttrium Sub-group rare earths per 25 mL final solution. Most of the accompanying ions do not interfere with the reaction. The method has been applied to the determination of yttrium subgroup rare earths in ores including cerium subgroup elements. The precision and recovery are both satisfactory.