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首页> 外文会议>RIAO/OPTILAS 2004 >Cr (Ⅲ) and Cr (Ⅵ) detection in water environment using an optical fiber grating sensor
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Cr (Ⅲ) and Cr (Ⅵ) detection in water environment using an optical fiber grating sensor

机译：使用光纤光栅传感器检测水环境中的Cr（Ⅲ）和Cr（Ⅵ）

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摘要

This work shows the application of an optical sensor to detect the presence of Cr (Ⅲ) and Cr (Ⅵ) oxidation states in water solutions. The sensing device is a long period grating produced in a standard telecommunication optical fiber by applying a suitable number of point-to-point electrical arc discharges from a fusion splicer. In order to analyze the Cr (Ⅲ) and Cr (Ⅵ) solutions, the sensing device is kept into a recipient under constant longitudinal stress and the Chromium solution samples are added to it. The results show that the sensor can not only detect the presence, but also differentiate between the two-oxidation states. Samples with Chromium concentrations from 0.16 mg/l to 5.2 mg/l are analyzed, leading to maximum wavelength shifts (relative to the LPG in pure water) of 0.14 nm and 0.26 nm for Cr (Ⅲ) and Cr (Ⅵ), respectively. A comparison between the results obtained for both solutions shows that is possible to identity any of the Chromium oxidation states present in the sample until a lower limit concentration of 2.6 mg/l for the employed set-up.
机译：这项工作表明了光学传感器在检测水溶液中Cr（Ⅲ）和Cr（Ⅵ）氧化态的存在中的应用。传感设备是标准电信光纤中通过施加适当数量的来自熔接机的点对点电弧放电产生的长周期光栅。为了分析Cr（Ⅲ）和Cr（Ⅵ）溶液，将传感装置在恒定的纵向应力下保持在容器中，并向其中添加铬溶液样品。结果表明，该传感器不仅可以检测存在，而且可以区分两种氧化状态。分析了铬浓度为0.16 mg / l至5.2 mg / l的样品，导致Cr（Ⅲ）和Cr（Ⅵ）的最大波长偏移（相对于纯水中的LPG）分别为0.14 nm和0.26 nm。对两种溶液获得的结果之间的比较表明，可以识别样品中存在的任何铬氧化态，直到采用的设置的下限浓度为2.6 mg / l为止。

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