摘要
研究了偶氮溴膦mB(BPAmB)与稀土元素的显色反应。在pH10的酸性介质中,试剂与轻、重稀土元素皆能形成二元蓝色络合物。在有少量乙醇存在的050～100mol/LHCl溶液中,轻稀土元素能与BPAmB和溴化十四烷基吡啶形成灵敏的三元蓝色络合物。轻稀土元素与BPAmB络合物的组成比为1∶3,轻稀土元素含量在0～15μg/25mL范围内符合比尔定律,表观摩尔吸收系数ε=12×105,而重稀土元素在同样条件下几乎不显色,因此可在重稀土元素存在下测定轻稀土元素的含量。该方法灵敏度高,选择性亦较好,用于铸铁和铝合金试样中轻稀土元素含量的测定,结果满意。
The color reaction of rare earth elements (RE) with bromophosphonazo-mB(BPAmB) has been studied. It has been found that BPAmB reacts with RE(including heavy-and light-RE) to form a blue binary complex in acidic medium (pH1-2).In 0 50-1 00mol/L hydrochloric acid solution containing suitable amount of ethanol and TPB, a highly sensitive ternary micell complex of light RE-BPAmB-TPB with apparent molar absorptivity up to ε=1 2×10 5L·mol -1 ·cm -1 at 700nm was formed, but in the same condition the color reaction of heavy-RE with BPAmB and TPB is almost not found. The composition ratio of light RE with BPAmB in the complex is 1∶3 Beer's law is obeyed in the range of 0-15μg/25mL for light RE. The method has good selectivity and can be applied to the spectrophotometric determination of the light RE in cast iron and aluminium alloy with satisfactory results.
出处
《冶金分析》
EI
CAS
CSCD
北大核心
2000年第1期14-17,共4页
Metallurgical Analysis
关键词
稀土元素
偶氮溴膦
溴化十四烷基
吡啶
显色反应
Rare earth element
Spectrophotometry
Bromophosphonazo-mB
Tetradecyl pyridinium bromide
