背景吸收强度可调控与扣除干扰组分影响的红外光谱测量方法  

Removing of Infrared Bands of Interferential Component from Complex Mixture Spectrum by Synthesizing a Background Spectrum with Absorption Controllable and Adjustable

作　　者：陈玉静[1] 王海水[1] 

机构地区：[1]华南理工大学化学与化工学院,广州510640

出　　处：《分析化学》2010年第2期267-270,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金(No.20873136)资助项目

摘　　要：多组分混合物的红外光谱由于特征谱带的重叠或部分重叠而给谱峰的归属辨认带来极大的困难。本研究通过扫描两个背景样品(纯KBr压片(1)和KBr+C18TCNQ压片(2))实时合成一系列背景单光束谱。每个背景单光束谱既含有背景样品1的贡献也含有背景样品2的贡献。干扰组分C18TCNQ在系列背景谱中的吸收强度随扫描次数变化而改变。当待测混合物和背景样品中干扰组分的吸收强度相等时,就可以完全扣除干扰组分的影响。本测量方法用于硬脂酸与C18TCNQ混合物中扣除硬脂酸(或者C18TCNQ)的干扰,得到令人满意的结果。合成背景样品中干扰组分的含量在测量时成为与扫描次数有关的变量,为扣除干扰组分的影响提供了直接便利的红外光谱测量方法。A method for removing the bands of interferential component from mixture infrared spectra during the measurement was presented.A synthetic background with the thickness of the interferential component adjustable and controllable was produced by scanning two different background samples in sequence.The absorption intensity of the synthetic background spectrum varies with the scanning number during the measurement.Therefore,when the infrared absorption of the interferential component in the background sample becomes equal to that in the mixture sample,the effect of interferential component can be deducted.This method was applied to stearic acid and 2-octadecyl-7,7,8,8-tetracyanoquinodimethane（C18TCNQ） mixture system.The results showed that the absorption peaks of stearic acid or C18TCNQ can be removed completely from the final resulted infrared spectrum.

关 键 词：红外光谱 干扰组分 双背景样品 合成背景谱 

分 类 号：O657.33[理学—分析化学]