石墨炉原子吸收光谱法测定2，3，4，4′-四羟基二苯甲酮中痕量铁

Determination of Trace Iron in 2,3,4,4′-Tetrahydroxybenzophenone by Graphite Furnace Atomic Absorption Spectrometry

建立了用石墨炉原子吸收光谱法测定2，3，4，4′-四羟基二苯甲酮中痕量铁的方法，用Zeemart／200型原子吸收分光光度计，在干燥温度120℃、灰化温度700℃、原子化温度2400℃、空心阴极灯电流3mA时，测定其铁的含量。铁质量浓度在2．5～10．0μg／L范围内与吸光度呈良好的线性关系，重复性（RSD）为1．99％，测定方法的回收率为94．2％，本方法精密度好，重现性好，可满足2，3，4，4′-四羟基二苯甲酮中痕量铁的原子吸收测定要求：

A determination method of trace iron in 2,3,4,4′-tetrahydroxybenzophenone by graphite furnace atomic absorption spectrometry is established. The optimum condition of graphite temperature and electric current of hollow cathode lamp were investigated. Determination conditions were： drying temperature 120 ℃, ashing temperature 700 ℃, atomization temperature 2 400 ℃, electric current of hollow cathode lamp 3 mA. There was a good linearity in range of 2.5-10.0 μg/L. Relative standard deviation（RSD） was 1.99 % , and recovery rate was 94. 2 %. This method was accurate and reproducible, and suitable for determination of trace iron in 2,3,4,4′-tetrahydroxybenzophenone.