电感耦合等离子体原子发射光谱法中Kalman滤波法解析重叠谱线的研究  

Kalman Filtering for Resolutlon of Overlapping Lines in Inductively Coupled Plasma Atomic Emission Spectrometry

作　　者：杨金夫[1] 朴哲秀[1] 曾宪津[1] 陈新海[1] 张卓勇[1] 关秋荻 

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《化学学报》1992年第10期1017-1023,共7页Acta Chimica Sinica

基　　金：国家自然科学基金;中国科学院数理化学局资助

摘　　要：考察了Kalman滤波技术校正ICP-AES中谱线重叠干扰的潜力.以新息序列的平均平方和为评价函数优化扫描光谱的峰位,消除扫描过程中可能产生的波长定位误差,从而保证滤波结果的准确性,并使实际检出限显著改善.在中等分辨率光谱仪和扫描步长为1.5pm的条件下,滤波器能有效地分辨峰间距只有4.8pm且峰形基本相同的重叠线对.对峰间距为9.8pm的重叠线对,当线背比低至0.05左右时仍能获得满意结果.连续背景用理论描述,因而样品溶液和纯组分溶液的光谱扫描无需扣除溶剂空白.A Kalman filter was developed for resolving overlapping lines in inductively coupled plasma atomic emission spectrometry (ICP-AES) and evaluated experimentally with the determination of La in the presence of Ho, and Cu in the presence of Pr. The whiteness of the innovation sequence for an optimal filter was explored to be the criterion for the correction of the wavelength positioning errors which may occur in spectral scans. Under the conditions of the medium-resolution spectrometer and 1.5 pm step size in scans, the filter effectively resolved the Cu/Pr line pair having a small peak separation of 4.8pm. For the La/Ho line pair with a peak distance of 9.8pm, an unbiased estimate for La concentration was still obtained even when the signal-to-background ratio was down to 0.048. Favourable detection limits for real samples were achieved. Unstructured backgrounds were modeled theoretically and all spectral scans therefore did not require the correction for solvent blank.

关 键 词：ICP-AES 卡尔曼滤波 光谱干扰 

分 类 号：O657.31[理学—分析化学]