机构地区: 中国农业大学理学院
出 处: 《光谱学与光谱分析》 2003年第6期1090-1092,共3页
摘 要: 用近红外光谱法对具有不同含量水平的环己烷、正己烷、甲苯、苯的四氯化碳混合溶液中的环己烷、正己烷、甲苯进行了定量分析。对于体积百分含量在1.4%~20%之间的环己烷,校正集真值与预测值相关系数r=0.9969,RSD=0.34%;对于体积百分含量在0.04%~0.96%的正己烷,校正集真值与预测值相关系数r=0.9999,RSD=0.83%;对于含量在26.0~259.8mg·L^(-1)的甲苯,校正集真值与预测值相关系数r=0.9921,RSD=4.63%。近红外光谱可以检测到26.0mg·L^(-1)的含量水平,其预测值为25.9mg·L^(-1),相对误差为0.38%。结果表明,用近红外光谱快速、准确、同时测定不同含量水平的组份可以获得较理想的结果。 In this paper, the contents of cycle-hexane, n-hexane and toluene in CCl4 solvent were simultaneously determined by near-infrared spectroscopy. In the mixture, the volumn concentration range of cycle-hexane and n-hexane is from 1.4%-20% and from 0.04%-20% respectively, and the concentration range of toluene is from 26.0-259.8 mg(.)L(-1). In the calibration set, the correlation coefficients between predicted value and true value of cycle-hexane, n-hexane and toluene are 0.996 9, 0.999 9 and 0.992 1 respectively, and RSDs are 0.34%, 0.83% and 4.63% respectively. The lowest content is 26.0 mg(.)L(-1) for toluene, whose estimated value is 25.9 mg(.)L(-1) , and relative error is 0.35%.