Rapid detection of organophosphates in aqueous solution using a hybrid organic/inorganic coating on SH-SAW devices

A. Mensah-Brown, D. Mlambo, F. Josse, J. Hossenlopp
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引用次数: 6

Abstract

Rapid detection of organophosphates pesticides (OPs) in groundwater is necessary to allow for real-time monitoring and cleanup. Detection of OPs in the liquid phase has already been demonstrated using poly(epichlorohydrin) [PECH] and polyurethane as the sensing layer. However, the response times are relatively long, on the order of hours. In this work, a hybrid organic/inorganic chemically sensitive layer [bisphenol A-hexamethyltrisiloxane (BPA-HMTS)] is synthesized and investigated for the rapid detection and analysis of organophosphate pesticides. Direct chemical sensing in aqueous solutions is performed using the guided shear horizontal surface acoustic wave sensor platform on 36° rotated Y-cut LiTaO3. It is shown that, for the same coating thickness, a 60% reduction in sensor response time is achieved without a significant reduction in sensitivity when compared with PECH. Considering the glass transition temperature, Tg, for the polymers, it is seen that the faster sensor response exhibited by the BPA-HMTS coating is due to the porous siloxane backbone, HMTS. Furthermore, sensor signal analysis in the form of the extended Kalman filter (EKF) is employed on-line during the detection process. This allows for the steady-state sensor response and absorption time constant to be extracted on-line well before equilibrium, thus further reducing the time required for analyte identification and quantification. 500 µg/L of parathion has been detected and a limit of detection of 20 µg/L (ppb) for parathion and 100 µg/L (ppb) of paraoxon is reported for the present non-optimized sensor.
在SH-SAW器件上使用混合有机/无机涂层快速检测水溶液中的有机磷酸盐
快速检测地下水中的有机磷农药(OPs)对于实时监测和清理是必要的。用聚环氧氯丙烷(聚氯丙烷)和聚氨酯作为传感层,已经证明了液相中OPs的检测。但是,响应时间相对较长,大约需要几个小时。本文合成了一种有机/无机杂化化学敏感层[双酚a -六甲基三硅氧烷(BPA-HMTS)],并对其用于有机磷农药的快速检测和分析进行了研究。在36°旋转y -切割LiTaO3上使用导向剪切水平表面声波传感器平台进行水溶液中的直接化学传感。结果表明,对于相同的涂层厚度,与PECH相比,传感器响应时间减少了60%,而灵敏度没有显着降低。考虑聚合物的玻璃化转变温度Tg,可以看出BPA-HMTS涂层的传感器响应速度更快是由于多孔硅氧烷骨架HMTS。在检测过程中,采用扩展卡尔曼滤波(EKF)的形式对传感器信号进行在线分析。这使得稳态传感器响应和吸收时间常数可以在平衡之前在线提取,从而进一步减少分析物鉴定和定量所需的时间。已检测到500µg/L的对硫磷,并报道了目前未优化的传感器的对硫磷和对硫磷的检测限分别为20µg/L (ppb)和100µg/L (ppb)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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