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目的建立石墨炉原子吸收光谱法测定猪肉中铅含量的方法,以石墨炉测定猪肉中重金属铅含量为目标,考察灰化温度、原子化温度等对测定结果的影响。方法实验中以磷酸二氢铵为基体改进剂,微波消解法对样品进行前处理,并优化灰化温度和原子化温度编辑石墨炉升温程序,建立石墨炉原子吸收光谱法测定猪肉中铅含量的方法。结果通过实验条件优化,最佳灰化温度为800℃,最佳原子化温度为1 300℃。铅浓度在0~15μg/L范围内线性关系良好,标准曲线的回归方程为y=0.020 3x+0.010 7,相关系数为0.999 9。特征浓度为0.22μg/L,检出限为0.062μg/L,精密度(RSD)为1.9%(n=7),加标回收率为98.4%。结论石墨炉原子吸收光谱法具有操作简便、灵敏度及回收率高等特点,能够准确、可靠地测定猪肉中铅的含量。
OBJECTIVE To establish a method for the determination of lead in pork by graphite furnace atomic absorption spectrometry, and to determine the content of heavy metal lead in pork by graphite furnace. The effects of ashing temperature and atomization temperature on the determination results were investigated. Methods In the experiment, ammonium dihydrogen phosphate was used as matrix modifier and microwave digestion method was used to pretreat the sample. The ashing temperature and atomization temperature were optimized. The temperature of graphite furnace was edited. The content of lead in pork was determined by graphite furnace atomic absorption spectrometry method. The results were optimized by the experimental conditions, the best ashing temperature is 800 ℃, the optimum atomization temperature is 1300 ℃. The linearity of lead concentration in the range of 0 ~ 15μg / L was good. The regression equation of the standard curve was y = 0.020 3x + 0.010 7 and the correlation coefficient was 0.999 9. The detection limit was 0.062μg / L, the precision was 0.22μg / L, the precision was (RSD) 1.9% (n = 7), and the recovery was 98.4%. Conclusion Graphite furnace atomic absorption spectrometry has the advantages of simple operation, high sensitivity and high recovery, and can accurately and reliably determine the content of lead in pork.