Determination of Fe in Graphene by Inductively Coupled Plasma Optical Emission Spectrometer

Abstract

The Fe in graphene was determined by inductively coupled plasma optical emission spectroscopy. The effects of digestion temperature, digestion system, analyzing spectral line, RF power, peristaltic pump flow rate, and working gas flow rate on the measurement results were investigated respectively. The results show that the best digestion effect appear when the digestion temperature is 550 °C and the digestion system is 3ml hydrochloric acid combined with 1ml nitric acid. The most stable and reliable test results obtained when the analyzing spectral line is 259.941 nm, the RF power is 1400W, the peristaltic pump flow rate is 50r/min, the atomizing gas flow rate is 0.8L/min, and the auxiliary gas flow rate is 1.0L/min. The detection limit of the measurement result is 0.029mg/L, the relative standard deviation (n=6) is between 2.5% and 3.2%, and the recovery is between 96.3% and 108.2%.