目的探索石墨炉原子吸收光谱法测定鲜蛋中痕量铅的检测条件。方法样品用硝酸-高氯酸消化后,添加基体改进剂磷酸二氢铵,用自动进样器进样测定铅。试验了基体改进剂用量、灰化温度和原子化温度对吸光度的影响。结果在该试验条件下,铅的检出限为0.38μg/L,精密度为2.6%,回收率为95%~101%,铅在0.0~20.0μg/L浓度范围内,与其吸光度呈良好的线性关系,线性方程y=0.007 1x+0.005 2,相关系数R2=0.999 6。结论该方法灵敏度高,准确,适合鲜蛋中痕量铅的检测。 Objective To explore the determination of trace lead in fresh eggs by graphite furnace atomic absorption spectrometry. Methods After the samples were digested with nitric acid-perchloric acid, the matrix modifier ammonium dihydrogen phosphate was added and the sample was measured by autosampler injection. The effect of substrate modifier dosage, ashing temperature and atomization temperature on absorbance was tested. Results The detection limit of Pb was 0.38μg / L, the precision was 2.6% and the recovery was 95% ~ 101% under the test conditions. The absorbance of Pb was within the range of 0.0 ~ 20.0μg / L, Linear relationship, the linear equation y = 0.007 1x + 0.005 2, the correlation coefficient R2 = 0.999 6. Conclusion The method is sensitive, accurate and suitable for the determination of trace lead in fresh eggs.