Determination of Fluoride in Food by Alkali-Melting-Ashing Ion Chromatography
Objective:To establish a method for the determination of fluoride in food by alkali fusion-ashing-ion chromatography.Method:The samples were melted and calcined with sodium hydroxide,ashed in a muffle furnace,filtered and detected by ion chromatography.The target compounds were separated by anion chromatography column and quantified by external standard method.Result:The linear range of the method was 0～2.000 mg·L-1,and the correlation coefficient was 0.999 1;the detection limit was 0.2 mg·kg-1,and the quantification limit was 0.5 mg·kg-1.According to the experimental method,the recovery rates of animal agricultural products were 81.3％～95.7％,and the relative standard deviations were 3.16％～6.57％;the recovery rates of plant agricultural products were 81.3％～89.6％,and the relative standard deviations were 3.28％～7.19％;the recovery rates of processed foods were 81.8％～94.9％,and the relative standard deviations were 1.97％～6.83％;the results of quality control samples met the labeling requirements.Conclusion:The method has good precision,repeatability and accuracy,is stable and reliable,and can provide technical support for the supervision of fluoride in food.
万方数据
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