本文以整体标准误差为基础的?函数为判断依据,运用计算机研究了CPA法用于多组份导数光谱时,测试波长位置、波长数目、波长间隔及混合标准溶液个数对计算结果的影响。当测试波长经过精选后,波长数可增至7,且准确度和精密度均有所提高。文中以SAF—CTMAB—Mo、W体系验证了结果,对M:W=1:10～10:1,M、W含量低达0.1μg/25ml的样品,四阶导数测试的结果为:相对误差一般在±6％以内,RSD(M_o)=0.76％,RSD(W)=2.03％。 In this paper, based on the global standard error function as the basis for judgment, the influence of the test wavelength position, the number of wavelengths, the wavelength interval and the number of mixed standard solutions on the calculation results when using the CPA method for multi-component derivative spectra was studied. When the test wavelength after selection, the wavelength can be increased to 7, and the accuracy and precision have increased. The results of the SAF-CTMAB-Mo, W system are validated in this paper. For the samples with M: W = 1: 10-10: 1 and M and W contents as low as 0.1μg / 25ml, the results of the fourth- Generally within ± 6%, RSD (M_o) = 0.76%, RSD (W) = 2.03%.