Abstract:

An analytical method was proposed for the determination of phosphorous content in iron phosphate for battery ma-terials using inductively coupled plasma atomic emission spectrometry（ICP-AES）.The sample was dissolved with hydrochlo-ric acid at low temperature and P 177.499 nm was selected as the analyzing spectrum line.The matrix effect of iron was elimi-nated by direct dilution and two-point background correction method.The results showed that the linear correlation coefficient of calibration graph in the range of 0~50 μg/mL of phosphorous mass concentration was over 0.999.The detection limit of this method was 0.02%.The proposed method was successfully applied to the determination of phosphorus in iron phosphate sam-ples and the determined relative standard deviation（RSD） was less than 0.50%.The analytical results were consistent with those obtained by industrial standard method HG/T 4701—2014,Quinoline Phosphomolybdate Gravimetric Method.

Key words: ICP-AES, iron phosphate, phosphorus