[Determination of 8 elements in food by inductively coupled plasma optical emission spectrometer simultaneously].

OBJECTIVE: To establish a method for determination of 8 elements including K, Na, Ca, Mg, Fe, Zn, Cu and Mn in food by inductively coupled plasma optical emission spectrometer (ICP-OES). METHODS: After high-pressure digestion by HNO3 in closed-vessel, 8 elements were simultaneously determined by ICP-OES. RESULTS: The detection limits of 8 elements ranged from 0. 02 to 6 mg/kg(solid samples), 0. 005 mg/L to 2 mg/L(liquid samples). The average correlation coefficients were; ≥0. 999 with good linearity. The precision ranged from 0. 1% to 9. 6%, the recoveries ranged from 88% to 115%. The results of analyzing standard materials were in the certificate values. CONCLUSION: The method is rapid and accurate with less interference which meets the technical requirements of food testing and can be applied to the determination of 8 elements in food simultaneously.