文献类型：期刊文献

英文题名：Assess the ability of detecting low concentration analyte with near-infrared spectroscopy based on dynamic enrichment

作者：Zhang, Xuan[1];Du, Yiping[1];Tong, Peijin[1];Li, Wei[1];Iqbal, Jibran[2];Wu, Ting[1];Hu, Huilian[1];Zhang, Weibing[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Res Ctr Anal & Test, Shanghai 200237, Peoples R China;[2]COMSATS Inst Informat Technol, Interdisciplinary Res Ctr Biomed Mat, Lahore, Pakistan

年份：2014

卷号：134

起止页码：58

外文期刊名：CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS

收录：;EI(收录号：20242716633885);WOS:【SCI-EXPANDED(收录号:WOS:000336828100007)】；

基金：This work was supported by the National Natural Science Foundation of China (20975039) and Science and Technology Commission of Shanghai Municipality (13142201200).

语种：英文

外文关键词：Kinetic modeling; Fluidized bed; Liquid film diffusion; Near-infrared diffuse reflectance spectroscopy (NIRDRS); Detection limit; Dynamic adsorption

摘要：The ability to detect low concentration analyte with near-infrared diffuse reflectance spectroscopy (NIRDRS) based on dynamic enrichment method has been assessed. A special design of fluidized bed enrichment device was used to enrich a large volume of analyte's dilute solution before spectrum detection, in order to improve the detection sensitivity of NIRDRS. A kinetic model, which considers the mass transfer with liquid film diffusion, has been used to characterize the adsorption process in this device. The developed model agreed with the experimental results very well in a wide range of the influent flow rate (F) and solution concentration (C-o). Based on this model, the lowest detectable concentration was estimated, at the same time the effects of liquid fluid rate and operation time on this value were also investigated. Meanwhile, a comparison between this model and the static adsorption model was made. Furthermore, a series of carbaryl aqueous solutions at different concentrations were treated with the enrichment device to verify the estimated lowest concentration. This study reveals that the specially designed fluidized bed device is able to enrich enough amount of analyte in a quite short time, and based on this dynamic adsorption model, it is possible to detect analyte in solution quantitatively at ppm-level by NIRDRS. (C) 2014 Elsevier B.V. All rights reserved.