Abstract：In this paper, a new method for determining composition ratio of complexes was stｕdied with ratio of double peak values at double wavelengths by UV spectrophotometry. The ratio of the maximｕm peak value to the minimｕm peak value and the composition ratio of complexes are the same. The calculation formula for the composition of complexes is deduced in accordance with beers law and the theory of dissociation equilibrium of complexes：N=(ΔA2εMRλ1-ΔA1εMRλ2)/(ΔA2εRλ1-ΔA1εRλ2). The calcｕlated value and that obtained bｙ traditional method are agreeable. The method is reliable，simple, visual and quick.
Key words：Ratio of double peak values;Composition of complexes;Double wavelength spectrophotometry
张霖霖1，张炎霖2，黄毓薇1，黄文金1 . 双波长双峰值比光度法测定配合物组成比的原理 [J]. 光谱学与光谱分析, 2004, 24(08): 999-1002.
ZHANG Lin-lin1，ZHANG Yan-lin2，HUANG Yu-wei1，HUANG Wen-jin1 . Principle of Determining the Composition of Complexes with the Ratio of Double Peak Values at Double Wavelengths by UV Spectrophotometry . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(08): 999-1002.
[1] LUO Qing-yao(罗庆尧编著). The Spectrophotometric Analysis(分光光度分析). Beijing: Science Press(北京：科学出版社)，1992. 226. [2] J. Inczedy(匈). The Analytical Application of Complex Equilibrium(络合平衡的分析应用). Translated by LI Yu-bin(刘玉彬译). Jilin: Jilin Press(吉林：吉林出版社)，1987. 10. [3] ZHU Yu-lun et al(朱玉伦等). Chinese J． of Analytical Chemistry(分析化学), 1991，19(2)：162. [4] ZHANG Lin-lin(张霖霖等). Journal of Nanchang University(南昌大学学报), 1995，19(2)：196. [5] DING Wei-de(丁维德). Computers and Applied Chemistry(计算机与应用化学)，1989，6(2)：159. [6] PING Xi-kang et al(平锡康等). Computers and Applied Chemistry(计算机与应用化学)，1990，7(1)：79. [7] ZHAO Shan-lin et al(赵杉林等). Chinese J． of Analytical Chemistry(分析化学), 1992，20(4)：464. [8] YANG Jian-nan et al(杨建男等). Chinese J． of Analytical Chemistry(分析化学), 1993，21(11)：1279. [9] CHEN Qiu-ying et al(陈秋影等). Journal of Color Metal of China(中国有色金属学报), 1996，6(2)：48. [10] LI Chang-hua et al(李长华等). Analytical Laboratory(分析试验室),1993，12(6): 31. [11] LIANG Wei-an et al(梁维安等). University Chemistry(大学化学)，2000，15(3)：57. [12] SONG Guang-quan et al(宋光泉等). The General Experimental Technique of Chemistry(通用化学实验技术). Guangzhou: Guangdong Higher Education Press(广州: 广东高等教育出版社)，1999. 3.
