偶氮氯膦Ⅲ吸光光度法测定轻、重稀土元素和钇

高等学校化学学报 ›› 1980, Vol. 1 ›› Issue (1): 53.

偶氮氯膦Ⅲ吸光光度法测定轻、重稀土元素和钇

蔡汝秀, 罗庆尧, 黎心懿, 李清香, 史广昭, 曾云鹗

武汉大学化学系

收稿日期:1979-11-26 出版日期:1980-06-24 发布日期:1980-06-24

SPECTROPHOTOMETRIC DETERMINATION OF LIGHTER AND HEAVIER RARE EARTHS AND YTTRIUM BY USING CHLOROPHOSPHONAZO--Ⅲ

Cai Ruxiu, Luo Qingyao, Li Xinyi, Li Qingxiang, Shi Guangzhao, Zeng Yune

Department of Chemistry, Wuhan University

Received:1979-11-26 Online:1980-06-24 Published:1980-06-24

摘要/Abstract

摘要： 本文研究了稀土元素与偶氮氯膦Ⅲ的α型及β型显色反应。在一定条件下,重稀土元素(Gd-Lu)同偶氮氯膦Ⅲ螯合物可由α型转变成β型,其中钇的螯合物转成β型倾向最大,而轻稀土元素在相同条件下仅形成α型,利用Zn-EDTA和Zn-CyDTA的掩蔽效应,可扩大显色反应的差异性。提出了在HCl-NaAc介质中分别测定轻、重稀土元素及钇的方法:在pH2.9-3.4范围内,用Zn-CyDTA作掩蔽剂,可在重稀土存在下测定轻稀土元素。在pH1.8-2.4和pH2.8-3.6,用Zn-EDTA、NaF或NaF作掩蔽剂可分别测定钇及重稀土元素。

Abstract: The color reactions of α-type and β-type of rare earths with chloro-phosphoaazo Ⅲ have been studied in this paper.Under a certain experimental condition,a-type of heavier rare earths (Gd to Lu) chelates of chlorophosphonazo Ⅲ can be converted to β-type.The tendency of the conversion of chelates of yttrium is the largest.The corresponding chelates of lighter rare earths (La to Eu) do not convert to β-type under the same condition.Masking effect of Zn-EDTA and Zn-CyDTA can be utilized to enlarge the difference of color reactions.Amethod for spectrophotome-tric determination of lighter and heavier rare earths,and yttrium in HCl-NaAc buffer solution has been suggested.Lighter rare earths can be determined in the presence of heavier rare earths at 684nm,pH 2.9-3.4,using Zn-CyDTAas the masking agent.Heavier rare earths and yttrium can be determined respectively in the presence of lighter rare earths at 740nm in tke range of pH2.8-3.6 and pH1.8-2.4,using Zn-EDTA+ NaFa nd NaF as a masking agent respectively.

TrendMD:

蔡汝秀, 罗庆尧, 黎心懿, 李清香, 史广昭, 曾云鹗. 偶氮氯膦Ⅲ吸光光度法测定轻、重稀土元素和钇. 高等学校化学学报, 1980, 1(1): 53.

Cai Ruxiu, Luo Qingyao, Li Xinyi, Li Qingxiang, Shi Guangzhao, Zeng Yune. SPECTROPHOTOMETRIC DETERMINATION OF LIGHTER AND HEAVIER RARE EARTHS AND YTTRIUM BY USING CHLOROPHOSPHONAZO--Ⅲ. Chem. J. Chinese Universities, 1980, 1(1): 53.