多元光谱拟合-电感耦合等离子体原子发射光谱法测定钢铁中的磷

Determination of Phosphorus in Steel by Multicomponent Spectral Fitting-Inductively Coupled Plasma Atomic Emission Spectrometry

研究了采用多元光谱拟合(MSF)功能ICP-AES法测定钢铁中磷的方法。采用MSF法扣除光谱干扰,选择波长为213.617nm的谱线作为磷的分析线,样品用硝酸(1+5)和浓盐酸溶解后可用ICP-AES直接测定。考察了仪器工作参数对测定结果的影响,确定了最佳工作条件:观测高度为13mm,雾化气流速为0.7L/min,射频功率为1300W。实验结果表明,方法的线性范围为0.05～100mg/L,线性相关系数为0.9998,检出限为0.0411mg/L,样品测定结果的相对标准偏差(RSD)为1.8%,加标回收率为96.1～100.8%。方法准确、快速,具有良好的精密度和准确度,可用于钢铁中磷的测定。

The （MSF）-inductive method for determination of phosphorus in steel by multi-component spectral fitting ly coupled plasma atomic emission spectrometry （ICP-AES） was introduced. In this paper, the MSF method was used to correct spectral interference and the spectral line with the wavelength of 213.617 nm was selected as the analysis line for phosphorus. Samples were dissolved in nitric acid （1＋5） and concentrated hydrochloric acid, and then without any separation were determined by ICP. The influence of instrument working parameters on the results were discussed. The optimal instrumental conditions were determined as following： 13 mm of observation height, 0.7 L/min of nebulizer gas flow rate and 1 300 W of RF power. The method has a wide linear rang of 0.05～100 mg/L with the linear correlation coefficient of 0. 999 8. The detection limit was 0.041 1 mg/L with relative standard deviations of 1.8% and the recovery was in the range of 96.1%～100.8%. The method is accurate and simple with satisfactory precision and accuracy, and is suitable for the determination of phosphorus in steel.