目的采用石墨炉原子吸收光谱法对我国部分地区液体乳样品中铅进行检测及含量调查。方法样品经微波消解后注入原子吸收分光光度计石墨炉中,电热原子化后吸收283.3 nm共振线,测得样品吸收值与标准系列比较定量。2013年6~8月采集全国15个省市的液体乳,对其铅含量进行调查。结果全国15个省市的98份样品中铅的总检出率仅为20.4%(20/98),检出样品的铅含量在2.53~30.5μg/kg之间,均低于铅限量标准,平均铅含量为2.43μg/kg。结论该样品量及区域范围内液体乳样品的测定结果显示,样品中铅含量普遍较低,但仍有一些样品检出微量的铅,仍需对液体乳的生产、储存和销售过程进行合理的全程控制,尽可能减低液体乳中的铅含量。 Objective To investigate the detection and content of lead in liquid milk samples in some areas of China by graphite furnace atomic absorption spectrometry. Methods The samples were digested by microwave and then injected into a graphite furnace of atomic absorption spectrophotometer. At 283.3 nm resonant line after electrothermal atomization, the sample absorption value was compared with that of the standard series. From June to August 2013, liquid milk was collected from 15 provinces and cities in China and its lead content was investigated. Results The total detection rate of lead in 98 samples of 15 provinces and cities in China was only 20.4% (20/98). The lead content in samples was between 2.53 and 30.5 μg / kg, which were lower than the limit of lead. The average lead content was 2.43 μg / kg. Conclusion The determination of liquid milk samples in the sample size and region shows that the sample generally contains a relatively low level of lead but some samples still contain trace amounts of lead. Therefore, it is still necessary to rationalize the production, storage and sale of liquid milk Full control, as much as possible to reduce the liquid milk of lead content.