胡椒基荧光酮光度法测定粉煤灰中微量镓

Determination of micro gallium in fly ash with piperonal fluorine by spectrophotometry

在表面活性剂OP存在下,镓与胡椒基荧光酮（PIF）在pH 6.0 HAc-NaAc缓冲溶液中形成蓝紫色配合物,其表观摩尔吸光系数为8.51×10^4 L·mol^-1·cm^-1,最大吸收波长为568 nm,配合物的组成比为n（Ga（Ⅲ））：n（PIF）=1：4.镓质量浓度在0～0.5 μg/mL范围内符合比耳定律,镓（Ⅲ）的标准加入回收率在96.5%～102.1%之间.结合乙酸丁酯萃取分离干扰元素,用于测定粉煤灰中微量镓.

In a buffer solution of HAc - NaAc （pH 6.0）, the Ga（ Ⅲ ） reacts with piperonal fluorine（PIF） to form a royal purple complex in the presence of emulsor OP. The complex exhibits maximum absorption at 568 nm with a apparent molar absorptivity of 8.51× 10^4 L·mol^-1, cm^-1. The molar ratio of gallium to piperonal fluorine in the complex is 1：4. Beer＇s law is obeyed for Ca（ Ⅲ ） in the range of 0 - 0.5 μg/mL, and the recoveries of standard addition of Ca（ Ⅲ ） are 96.5% - 102.1%. Combined with n-butyl acetate extraction, the method has been applied to the determination of micro Ga in fly ash with satisfactory results.