Evaluation of the availability of bound analyte for passive sampling in the presence of mobile binding matrix.
Evaluation of the availability of bound analyte for passive sampling in the presence of mobile binding matrix.
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评估在存在移动结合基质的情况下用于被动采样的结合分析物的可用性
DOI：
10.1016/j.aca.2016.02.039
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Ouyang Gangfeng
中科院分区：
文献类型：
--
作者：
Xu Jianqiao;Huang Shuyao;Jiang Ruifen;Cui Shufen;Luan Tiangang;Chen Guosheng;Qiu Junlang;Cao Chenyang;Zhu Fang;Ouyang Gangfeng
阐明的可用性的结合分析物的质量传递通过扩散边界层（DBL）相邻的被动采样器是重要的了解被动采样动力学复杂的样品，其中结合分析物的不稳定因素在DBL是一个重要的参数。通过假定被动进样过程为拟稳态，推导出不稳定因子的数学表达式，该表达式表明不稳定因子等于结合态和游离态分析物的归一化浓度梯度之比。通过引入不稳定因子的数学表达式，证明了修正的有效平均扩散系数更适合描述移动的结合基质存在时的被动采样动力学。在此基础上，计算了十二烷基硫酸钠（SDS）胶束作为结合基质时多环芳烃（PAHs）的不稳定因子。观察到的不稳定因素，以减少较大的结合比和较小的胶束尺寸，并成功地用于预测多环芳烃通过DBLs的传质效率。本研究将促进对被动采样的基础上的理论改进和实验评估的结合分析物的可用性的理解。
Elucidating the availability of the bound analytes for the mass transfer through the diffusion boundary layers (DBLs) adjacent to passive samplers is important for understanding the passive sampling kinetics in complex samples, in which the lability factor of the bound analyte in the DBL is an important parameter. In this study, the mathematical expression of lability factor was deduced by assuming a pseudo-steady state during passive sampling, and the equation indicated that the lability factor was equal to the ratio of normalized concentration gradients between the bound and free analytes. Through the introduction of the mathematical expression of lability factor, the modified effective average diffusion coefficient was proven to be more suitable for describing the passive sampling kinetics in the presence of mobile binding matrixes. Thereafter, the lability factors of the bound polycyclic aromatic hydrocarbons (PAHs) with sodium dodecylsulphate (SDS) micelles as the binding matrixes were figured out according to the improved theory. The lability factors were observed to decrease with larger binding ratios and smaller micelle sizes, and were successfully used to predict the mass transfer efficiencies of PAHs through DBLs. This study would promote the understanding of the availability of bound analytes for passive sampling based on the theoretical improvements and experimental assessments.