摘要
研究了对乙酰基偶氮氯膦与镧的显色反应 ,在 0 .2 mol/L 盐酸介质中 ,有乙醇及吐温 - 80存在时 ,生成3∶ 1紫色络合物。 λmax=6 75 nm,ε=7.33× 1 0 4 L· mol- 1· cm- 1。采用双波长法 ,以 5 30 nm为参比波长 ,6 75 nm为测定波长 ,ε=9.2 0× 1 0 4 L· mol- 1· cm- 1 ,镧含量在 0— 37.5 μg/2 5 m L范围内符合比耳定律。本法用于电子工业钛酸镧烧结中游离氧化镧的测定 ,结果令人满意。
The chromogenic reation of lanthanum(Ⅲ) with p acetyl chlorophosphonazo ( p ACPA) has been studied.The medium of 0.2mol/L HCl with the presence of toween 80 and ethyl alcohol,lanthanum(Ⅲ) and p ACPA form 1∶3 complex.The complex can be determined by single wavelength sepectrophotometry of 675nm and dual wavelengh spectrophotometry at 675—530nm.The molar absorptivity of complex is 7.33×10 4 and 9.20×10 4 L·mol -1 ·cm -1 .Beer's law is obeyed in the range of 0—37.5μg/25mL.It was applied to determine La 2O 3 in lanthanum titante sinter with satisfactory results.
出处
《光谱实验室》
CAS
CSCD
2000年第5期528-530,共3页
Chinese Journal of Spectroscopy Laboratory
