Determination of Fluoride in Sea Food and Meat by Ion Chromatogram

Objective To develop an ion chromatogram method for determination of fluoride in the sea food and meat. Methods Under the acid condition,fluorine could be separated by distillation,then fluorine is absorbed by washing liquid. The electricity lead detection-ion chromatogram with Ionpac AS14 column was employed to determine the content of fluoride,3.5 mmol/L of sodium carbonate-1.0 mmol/L of soda as the washing liquid at 1.2 ml/ min. Results The linear range was 0.05-1.0 mg/L,the relative coefficient (r) was more than 0.999 7 (n=6),the lowest detection limit was 0.3 mg/kg,the relative standard deviation was 1.00%-3.85%,the recovery rates were 88.1%-99.0%. Conclusion This method presents a good effect of pretreatment and fluorine ion seperation and with a satisfactory recovery rate,precision and detection limit.