采用电感耦合等离子体原子发射光谱法测定钨合金中镍、铁、钴和锰的含量。优化的试验条件如下:① 柠檬酸溶液用量为2 mL;② 过氧化氢溶液用量为12 mL;③ 称样量为0.100 0 g;④ 氨水溶液用量为2 mL。选择镍、铁、钴、锰的分析谱线分别为221.647,233.280,228.616,259.373 nm。4种元素在一定的质量浓度范围内与其发射强度呈线性关系,方法的检出限(3s/k)在0.018~0.083 mg·L-1之间。方法应用于标准物质(JBWY05901)的分析,测定值与认定值相符。方法用于生产样品和合成样品的分析,测定值的相对标准偏差(n=6)在0.72%~3.9%之间。

ICP-AES was applied to the determination of Ni, Fe, Co and Mn in tungsten alloy. The optimized conditions found were as follows: ① amount of citric acid solution: 2 mL; ② amount of H2O2 solution: 12 mL; ③ sample weight: 0.100 0 g; ④ amount of NH3·H2O solution: 2 mL. Analytical spectral lines of 221.647, 233.280, 228.616, 259.373 nm were chosen for the determination of Ni, Fe, Co and Mn respectively. Linear relationships between values of emission intensity and mass concentration of the 4 elements were kept in definite ranges. Detection limits (3s/k) found were ranged from 0.018 to 0.083 mg·L-1. The proposed method was applied to the analysis of standard samples (JBWY05901), giving results in consistency with the certified values. Production sample and synthetic sample were also determined by this method, values of RSD′s found were (n=6) in the range of 0.72%-3.9%.