摘要
在０００３ｍｏｌ·Ｌ－１（ＣＨ２）６Ｎ４ＨＣｌ缓冲底液中，偶氮溴磺（Ⅲ）在示波极谱仪上产生三个良好的还原波：Ｐ１（－０．２５Ｖ）、Ｐ２（－０．３５Ｖ）和Ｐ３（－０．５７Ｖ），加入稀土离子后，试剂峰高降低，并在更负的电位处产生络合吸附波Ｐ４（－０．６２Ｖ）。Ｐ４峰高与稀土离子的浓度有良好的线性关系，用来测定Ｃｅ３＋，检测下限可达２×１０－８ｍｏｌ·Ｌ－１。轻、重稀土有类似的响应。
In 0.003 mol·L -1 (CH 2) 6N 4 HCl buffer solution at pH=5.50, bromosulphonazo (Ⅲ) gave three reduction peaks: P 1 (-0.25 V), P 2 (-0.35 V) and P 3 (-0.57 V) (SCE) in single sweep polarography. When rare earth elements were added, the peaks of reagent decreased and a new peak appeared at more negative potential P 4 (-0.62 V). The peak height of P 4 was linear with the ion concentration (from 6.6×10 -8 to 2.3×10 -5 mol·L -1 ) of rare earth elements. The composition of the complex was determined to be 1∶1. The stability constant of the complex was 1.03×10 5. This method was used successfully to determine rare earth elements of the sample with satisfactory results.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
1998年第5期331-336,共6页
Chinese Journal of Rare Metals
基金
甘肃省自然科学基金
