火花源原子发射光谱法测定不锈钢中痕量铝  

Determination of trace aluminum in stainless steel by spark source atomic emission spectrometry

作　　者：叶慕舟 

机构地区：[1]宝钢工业技术服务有限公司,上海201900

出　　处：《冶金分析》2015年第4期13-18,共6页Metallurgical Analysis

摘　　要：常规的国家标准方法(EDTA滴定法或分光光度法)不满足铝质量分数小于0.01%的不锈钢分析要求。试验通过新建铝元素虚拟分析通道,重建虚拟通道的分析曲线,消除不锈钢中含量较高的共存元素对于铝元素测定的干扰,利用原通道和虚拟通道分离铝元素的分析范围,使用高低标法对低含量段铝进行校正,提高了火花源原子发射光谱仪对于不锈钢中痕量铝元素的分析准确度。试验证明:上述改进对于光谱测定不锈钢中痕量铝含量的准确度有明显的提升;在不锈钢中铝质量分数小于0.001%的情况下,该方法的测定误差可以控制在0.000 5%以内且分析精密度与电感耦合等离子体原子发射光谱法(ICP-AES)的精密度相近;经统计分析,铝元素分析曲线校正后12h内不易发生漂移;生产样均匀性能够满足分析要求。因此实验方法能够满足不锈钢生产试样炉前快速分析的需要。The conventional national standard methods （EDTA titration or spectrophotometry） were not suitable for the analysis of aluminum in stainless steel with mass fraction less than 0.01%. The virtual analysis channel of aluminum was newly established to recreate the analysis curve of virtual channel. The interference of high-content coexisting elements in stainless steel was eliminated. The low-content alumi- num was corrected by high and low standard method based on the analysis range of aluminum after separa- tion by original channel and virtual channel. The analysis accuracy of trace aluminum in stainless steel by spark source atomic emission spectrometry was improved. The testing results proved that the proposed method significantly enhanced the determination accuracy of trace aluminum in stainless steel by spectrom- etry. When the mass fraction of aluminum in stainless steel was less than 0. 001~, the determination error of proposed method could be controlled within 0. 000 5 ~. Moreover, the analysis precision was similar to that of inductively coupled plasma atomic emission spectrometry（ICP-AES）. The statistical analysis indi- cated that no drift was observed for curve of aluminum after correction within 12 h. The uniformity of pro- duction samples could meet the requirements of analysis. Therefore, the proposed method could satisfy the requirements of rapid ladle analysis of stainless steel production samples.

关 键 词：火花源原子发射光谱法 不锈钢 痕量铝 虚拟分析通道 

分 类 号：TG115.33[金属学及工艺—物理冶金]