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Compact and autonomous multiwavelength microanalyzer for in-line and in situ colorimetric determinations

机译:紧凑,自主的多波长微分析仪,用于在线和原位比色测定

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摘要

Nowadays, the attainment of microsystems that integrate most of the stages involved in an analytical process has raised an enormous interest in several research fields. This approach provides experimental set-ups of increased robustness and reliability, which simplify their application to in-line and continuous biomedical and environmental monitoring. In this work, a novel, compact and autonomous microanalyzer aimed at multiwavelength colorimetric determinations is presented. It integrates the microfluidics (a three-dimensional mixer and a 25 mm length "Z-shape" optical flow-cell), a highly versatile multiwavelength optical detection system and the associated electronics for signal processing and drive, all in the same device. The flexibility provided by its design allows the microanalyzer to be operated either in single fixed mode to provide a dedicated photometer or in multiple wavelength mode to obtain discrete pseudospectra. To increase its reliability, automate its operation and allow it to work under unattended conditions, a multicommutation sub-system was developed and integrated with the experimental set-up. The device was initially evaluated in the absence of chemical reactions using four acidochromic dyes and later applied to determine some key environmental parameters such as phenol index, chromium(VI) and nitrite ions. Results were comparable with those obtained with commercial instrumentation and allowed to demonstrate the versatility of the proposed microanalyzer as an autonomous and portable device able to be applied to other analytical methodologies based on colorimetric determinations.
机译:如今,集成了分析过程中大多数阶段的微系统的实现引起了人们对几个研究领域的极大兴趣。这种方法提供了提高鲁棒性和可靠性的实验装置,从而简化了它们在在线和连续生物医学和环境监测中的应用。在这项工作中,提出了一种针对多波长比色测定的新颖,紧凑,自主的微量分析仪。它在同一设备中集成了微流体技术(三维混合器和25 mm长的“ Z形”光流通池),高度通用的多波长光学检测系统以及用于信号处理和驱动的相关电子设备。其设计提供的灵活性允许微型分析仪以单一固定模式操作以提供专用的光度计,或者以多波长模式操作以获得离散的伪光谱。为了提高其可靠性,自动化其操作并使其能够在无人看管的条件下工作,开发了多换向子系统并将其与实验装置集成在一起。该设备最初在没有化学反应的情况下使用四种酸性染料进行了评估,随后用于确定一些关键的环境参数,例如酚指数,六价铬和亚硝酸根离子。结果与使用商业仪器获得的结果相当,并且可以证明拟议的微型分析仪具有多种功能,可以作为自动和便携式设备使用,并且可以基于比色测定应用于其他分析方法。

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