拟定了Ｎ＿２Ｏ－Ｃ＿２Ｈ＿２火焰原子吸收光谱法测定轻稀土分组中钐的方法。重点试验了十二烷基硫酸钠（ＳＤＳ）、磺基水杨酸（ＳＳＡ）以及ＳＤＳ＋ＳＳＡ三体系分别对钐的增感效应。结果发现三体系均对钐有不同程度的增感作用，以ＳＤＳ＋ＳＳＡ体系较好，提高钐的灵敏度为７５％。并针对不同体系的雾化效率，对增感机理进行了初步的讨论。本方法回收率大于９５％，相对标准偏差为１．１％。 A method for the determination of samarium in light rare earth group by N_2O-C_2H_2 flame atomic absorption spectrometry was developed. The sensitizing effects of sodium dodecyl sulfate (SDS), sulfosalicylic acid (SSA) and SDS + SSA system on samarium were emphatically studied. The results showed that the three systems all have different sensitization effects to samarium. The SDS + SSA system is better, and the sensitivity of samarium is 75%. According to the atomization efficiency of different systems, the mechanism of sensitization was discussed. The recovery of this method is greater than 95% with a relative standard deviation of 1.1%.