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目的建立石墨炉原子吸收光谱法(GFAAS)测定生猪肉中微量铅、镉。方法采用湿式消解法对样品进行处理;以磷酸二氢铵作为基体改进剂,优化基体改进剂的选择、用量及原子化温度,并对常见元素测定的干扰等进行研究;采用石墨炉原子吸收光谱法(GFAAS)进行测定。结果在优化实验条件下,本法铅的检出限为0.42μg/L、相对标准偏差(RSD)为4.1%(n=11,c=20μg/L)、相关系数(r)为0.99 947;镉为0.001μg/L、相对标准偏差(RSD)为2.9%(n=11,c=2.0μg/L)、相关系数(r)为0.99 950,标准曲线线性关系均良好,加标回收率铅在93.0%～103.2%,镉在92.0%～102.0%。结论该方法检出限低,灵敏度高,标准曲线线性好,适用于生猪肉中微量铅、镉的测定。
Objective To establish a graphite furnace atomic absorption spectrometry (GFAAS) for the determination of trace lead and cadmium in raw pork. Methods The samples were treated by wet digestion method. With ammonium dihydrogen phosphate as matrix modifier, the selection, dosage and atomization temperature of matrix modifier were optimized, and the interferences of common element determination were studied. By graphite furnace atomic absorption spectrometry Method (GFAAS) for determination. Results Under the optimized experimental conditions, the detection limit of lead in this method was 0.42 μg / L with relative standard deviation (RSD) of 4.1% (n = 11, c = 20 μg / L) and the correlation coefficient (r) was 0.99 947. The relative standard deviation (RSD) was 2.9% (n = 11, c = 2.0 μg / L) and the correlation coefficient (r) was 0.99 950 with good linearity of standard curve. 93.0% ~ 103.2%, cadmium 92.0% ~ 102.0%. Conclusion The method has the advantages of low detection limit, high sensitivity and good linearity of standard curve. It is suitable for the determination of trace lead and cadmium in raw pork.