Abstract: 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 2400℃,electric current of hollow cathode lamp 3mA. There was a good linearity in range of 2.5-10.0μg/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.

Key words: atomic absorption spectrometry, graphite furnace, 4'-tetrahydroxybenzophenone, trace iron