水中柴油浓度峰值法与积分荧光测量模型性能比较

发布时间：2018-04-01 20:10

本文选题：荧光　切入点：柴油　出处：《中国测试》2017年12期

【摘要】：针对浓度荧光测量时峰值法和积分法的选择问题,在理论和实验两方面对两种方法进行比较。首先理论分析峰值法和积分法的浓度测量原理;其次利用FS920型稳态荧光光谱仪扫描纯水、柴油与其混合液样品的三维荧光光谱,根据最强荧光峰确定样品的最佳激发波长为290 nm;再次根据最佳激发波长扫描浓度较低的5种样品的二维荧光光谱,由平均光谱确定主峰和肩峰波长分别为360 nm和326 nm;然后分析比较主峰和肩峰中心扩展区间和区域内积分荧光法校正模型参数的变化规律;最后,通过留一法交叉验证7种不同方法所建浓度校正模型的精度并进行比较。实验结果表明:在低浓度下,峰值和积分荧光强度与浓度之间都具有良好的线性关系,相关系数r0.99,与理论相符;相关系数和校正决定系数随积分范围的增大先增大后减小,在峰值附近2~10 nm范围内存在极值;就积分荧光浓度模型本身而言,主峰优于肩峰,模型灵敏度、模型误差与残差平方和随积分范围的增大而增大;在浓度配置误差范围内,峰值法和积分法浓度测量绝对误差的平均值均在0.002‰以内。
[Abstract]:Aiming at the problem of peak selection method and integral method the concentration of fluorescence measurement, in two aspects of theory and experiment of the two methods were compared. The first principle theory analysis of peak concentration measurement method and integral method; then using the FS920 steady-state fluorescence spectrometer scanning with pure water, diesel mixed liquid samples according to the three-dimensional fluorescence spectra, the strongest fluorescence the peak were determined the optimal excitation wavelength is 290 nm; again according to the two-dimensional fluorescence spectra of 5 samples of the best excitation wavelength scanning low concentration, and determined by the average spectral peak peak wavelength were 360 nm and 326 nm; and then analyzes the change rule is the highest peak and center region and acromion extended interval integral fluorescence correction model finally, through the parameter; leave one cross validation of 7 different methods for the concentration correction precision of the model were compared. The experimental results show that under the condition of low concentration peak Have a good linear relationship between the fluorescence intensity and concentration and integral, correlation coefficient r0.99, consistent with the theory; increase the correlation coefficient and the correction coefficient of determination with integral range increases first and then decreases, the existence of extrema in the peak near 2~10 in the range of nm; on the integral fluorescence concentration model is better than the peak itself, acromion, model sensitivity. Increase of model error and residual sum of squares with integral range increases; when the concentration of configuration error range, peak method and integral method for measuring the concentration of the mean absolute error was less than 0.002 per thousand.

【作者单位】：燕山大学理学院;燕山大学里仁学院;
【基金】：国家自然科学基金青年科学基金(11504320)
【分类号】：O657.3;X832

【相似文献】