采用电弧直读发射光谱法直接测定铑粉中的17种杂质元素的含量。将铑粉与缓冲剂（碳粉、碳酸锂和氟化钠按质量比7：1：2混合）混合研磨制备测试样品，单次样品激发时间小于1 min，铑粉中17种杂质元素的最佳光谱采集时间为15~55 s。17种元素的质量分数与其光谱强度分别在一定的范围内呈线性关系，方法的检出限（3s）为0.018 3~1.302 μg·g^-1。方法用于铑粉样品分析，加标回收率为92.2%~105%，所得日内相对标准偏差（n=5）为6.9%~19%，日间相对标准偏差（n=5）为1.5%~5.1%；测定结果与电感耦合等离子体原子发射光谱法（ICP-AES）检测结果相符。

The content of 17 impurity elements in rhodium powder was determined by arc direct reading emission spectrometry. The rhodium powder was mixed and ground with buffer (toner, lithium carbonate, sodium fluoride according to 7:1:2 mass ratio) to prepare the test sample. The excitation time of single sample was less than 1 min, andthe optimal spectral collection time of 17 impurity elements in rhodium powder was in the range of 15-55 s. Linear relationships between mass fraction and spectral intensity of 17 elements were found in the definite ranges, with detection limit (3s) in the range of 0.018 3-1.302 μg·g^-1. The proposed method was applied to the analysis of rhodium powder sample, giving values of recovery ranged from 92.2% to 105%. Values of intra-day and inter-day RSDs (n=5) found were in the range of 6.9%-19% and 1.5%-5.1% respectively. The results obtained by this method were consistent with those of ICP-AES.