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1引言小波分析方法是一种新发展起来的数学方法。本文采用小波分析光谱实验数据进行预处理，然后用偏最小二乘法（PLS）进行校正，完成了钨、钼、钛的同时测定。2实验部分2．1主要仪器与试剂日立557双波长分光光度计；奔腾586微机。W（Ⅵ）标准溶液10mg／L；Mo（Ⅵ）标准溶液2m
1 Introduction Wavelet analysis is a newly developed mathematical method. In this paper, wavelet analysis of experimental data pretreatment, and then use partial least squares (PLS) to correct, completed the determination of tungsten, molybdenum, titanium. 2 Experimental 2.1 The main instruments and reagents Hitachi 557 dual-wavelength spectrophotometer; Pentium 586 microcomputer. W (Ⅵ) standard solution 10mg / L; Mo (Ⅵ) standard solution 2m