Adsorption kinetics of pesticide in soil assessed by optofluidics-based biosensing platform. (February 2015)

• Record Type: Journal Article
• Authors: Long, Feng; Zhu, Anna; Shi, Hanchang; Sheng, Jianwu; Zhao, Zhen
• Is Part Of: Chemosphere. Volume 120(2015)
• Page Start: 615
• Page End: 620
• Publication Date: 2015-02
• Subjects: Optofluidics -- Biosensor -- Adsorption kinetics -- Fluorescence immunoassay -- Atrazine; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2014.09.072
• Languages: English
• ISSNs: 0045-6535

Abstract

Highlights: Optofluidic biosensor was firstly used for adsorption kinetics assay of pesticides. The platform shows unique advantages for investigation of adsorption kinetics in soil. The platform is sensitivity, rapidity, small sample volume, and cost-effective. A simple and green method used to investigate transport mechanism of trace analytes. Abstract: The adsorption of pesticides in soil is a key process that affects transport, degradation, mobility, and bioaccumulation of these substances. To obtain extensive knowledge regarding the adsorption processes of pesticides in the environment, the new green assay technologies for the rapid, sensitive, field-deployable, and accurate quantification of pesticides are required. In the present study, an evanescent wave-based optofluidics biosensing platform (EWOB) was developed by combining advanced photonics and microfluidics technology for the rapid sensitive immunodetection and adsorption kinetics assay of pesticides. The robustness, reusability, and accuracy of the EWOB allow an enhanced prediction of pesticide adsorption kinetics in soil. Using atrazine (ATZ) as the target model, we found that the adsorption kinetics in soil followed a pseudo-second-order kinetic model. EWOB was compared with liquid chromatography–mass spectrometry/mass spectrometry (LC–MS/MS) method and yielded a good correlation coefficient ( r 2 = 0.9968). The underestimated results of LC–MS/MS resulted in a higher adsorption constant of ATZ in soil derived from LC–MS/MS than that of a biosensor. The proposed EWOB system provides a simple, green, and powerful tool to investigate the transport mechanism and fate of pesticide residues.