火花源原子发射光谱法测定不锈钢中痕量铝

发布时间：2018-10-14 16:10

【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。
[Abstract]:Conventional national standard methods (EDTA titration or spectrophotometry) do not meet the analytical requirements of stainless steel with aluminum content less than 0.01%. The analysis curve of the virtual channel was reconstructed by establishing the virtual analysis channel of aluminum element, and the interference of the high content coexisting elements in stainless steel to the determination of aluminum element was eliminated, and the analysis range of aluminum element was separated by the original channel and virtual channel. The calibration method was used to correct the low content aluminum in stainless steel, which improved the accuracy of the analysis of trace aluminum in stainless steel by spark source atomic emission spectrometer. The experimental results show that the improved method can improve the accuracy of the spectral determination of trace aluminum in stainless steel, and when the mass fraction of aluminum in stainless steel is less than 0.001%, The precision of this method is close to that of inductively coupled plasma atomic emission spectrometry (ICP-AES), and it is not easy to drift within 12 hours after the correction of the analytical curve of aluminum element, and the precision of the method can be controlled within 0.5%, and the precision of the method is close to that of inductively coupled plasma atomic emission spectrometry (ICP-AES). The uniformity of production samples can meet the requirements of analysis. Therefore, the experimental method can meet the needs of rapid analysis of stainless steel samples before furnace.
【作者单位】：宝钢工业技术服务有限公司;
【分类号】：TG115.33

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