Identification and Quantitation of Aqueous Single- and Multianalyte Solutions of the Isomers Ethylbenzene, m-, p-, and o-Xylene Using a Single Specifically Tailored Sensor Coating and Estimation Theory-Based Signal Processing,ACS Sensors

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Identification and Quantitation of Aqueous Single- and Multianalyte Solutions of the Isomers Ethylbenzene, m-, p-, and o-Xylene Using a Single Specifically Tailored Sensor Coating and Estimation Theory-Based Signal Processing
ACS Sensors ( IF 8.2 ) Pub Date : 2022-07-27 , DOI: 10.1021/acssensors.2c01024
Nicholas Post ₁ , Florian Bender ₁ , Fabien Josse ₁ , Edwin E Yaz ₁ , Antonio J Ricco ₂

Affiliation

The isomer-specific detection and quantitation of m-, p-, and o-xylene and ethylbenzene, dissolved singly and as mixtures in aqueous solutions at concentrations from 100 to 1200 ppb by volume, is reported for a specifically designed polymer-plasticizer coating on a shear-horizontal surface acoustic wave (SH-SAW) device. The polystyrene-ditridecyl phthalate-blend coating was designed utilizing Hansen solubility parameters and considering the dipole moment and polarizability of the analytical targets and coating components to optimize the affinity of the sensor coating for the four chemical isomers. The two key coating sorption properties, sensitivity and response time constant, are determined by the (slightly different) dipole moments and polarizabilities of the four target analytes: as analyte dipole moment decreases, coating sensitivity increases; as analyte polarizability decreases, coating response time lengthens. Using the measured sensitivities and time constants for the targets, sensor signals were processed with exponentially weighted recursive-least-squares estimation (EW-RLSE) to identify (with near 100% accuracy) and quantify (with ± 5–7% accuracy) the isomers. This impressive performance was achieved by combining the specifically tailored, high-sensitivity coating and an SH-SAW platform (yielding a detection limit of 5 ppb for the analytes) and using the EW-RLS estimator, which estimates unknown parameters accurately even in the presence of measurement noise and for analytes with only minor differences in response. Identification of the xylene isomers is important for applications including environmental monitoring and chemical manufacturing.

中文翻译：

使用专门定制的单一传感器涂层和基于估计理论的信号处理对异构体乙苯、间-、对-和邻-二甲苯的单分析物和多分析物水溶液进行鉴定和定量

m -、p - 和o的异构体特异性检测和定量-二甲苯和乙苯单独溶解或混合溶解在浓度为 100 至 1200 ppb 的水溶液中，据报道用于水平剪切表面声波 (SH-SAW) 设备上专门设计的聚合物增塑剂涂层。聚苯乙烯-邻苯二甲酸二十三酯混合物涂层是利用汉森溶解度参数设计的，并考虑了分析目标和涂层组分的偶极矩和极化率，以优化传感器涂层对四种化学异构体的亲和力。两个关键的涂层吸附特性，灵敏度和响应时间常数，由四种目标分析物的（略有不同的）偶极矩和极化率决定：随着分析物偶极矩的降低，涂层灵敏度增加；随着分析物极化率的降低，涂层响应时间延长。使用目标的测量灵敏度和时间常数，使用指数加权递归最小二乘估计 (EW-RLSE) 处理传感器信号，以识别（准确度接近 100%）和量化（准确度为 ± 5-7%）异构体。这种令人印象深刻的性能是通过结合专门定制的高灵敏度涂层和 SH-SAW 平台（对分析物产生 5 ppb 的检测限）并使用 EW-RLS 估计器实现的，即使在存在的情况下也能准确估计未知参数测量噪声和分析物的响应只有微小的差异。二甲苯异构体的鉴定对于包括环境监测和化学品制造在内的应用很重要。传感器信号使用指数加权递归最小二乘估计 (EW-RLSE) 进行处理，以识别（准确度接近 100%）和量化（准确度为 ± 5–7%）异构体。这种令人印象深刻的性能是通过结合专门定制的高灵敏度涂层和 SH-SAW 平台（对分析物产生 5 ppb 的检测限）并使用 EW-RLS 估计器实现的，即使在存在的情况下也能准确估计未知参数测量噪声和分析物的响应只有微小的差异。二甲苯异构体的鉴定对于包括环境监测和化学品制造在内的应用很重要。传感器信号使用指数加权递归最小二乘估计 (EW-RLSE) 进行处理，以识别（准确度接近 100%）和量化（准确度为 ± 5–7%）异构体。这种令人印象深刻的性能是通过结合专门定制的高灵敏度涂层和 SH-SAW 平台（对分析物产生 5 ppb 的检测限）并使用 EW-RLS 估计器实现的，即使在存在的情况下也能准确估计未知参数测量噪声和分析物的响应只有微小的差异。二甲苯异构体的鉴定对于包括环境监测和化学品制造在内的应用很重要。

更新日期：2022-07-27

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