基于微型光纤吸收传感器检测水体中痕量物质方法的研究
发布时间：2018-09-05 18:00
【摘要】：水体环境中痕量重金属离子及无机污染物的分析测定是现代分析化学的一个重要分支。目前的大型仪器设备只适合在实验室内使用,无法实现现场分析测定。日益严峻的水体污染事件要求环境分析技术向现场化和便携化方向发展。本论文将光导纤维与光谱技术相结合,构建了微型吸收型光纤化学传感器,利用其传输损耗小、传输容量大、灵敏度高、可微型化、抗电磁干扰和防腐蚀能力强等优点,应用于水体环境中痕量污染物的实时在线分析检测。论文构建了微升级检测池的光纤吸收检测探头,将其集成于阀上实验室(LOV)系统,结合微顺序注射分析技术,建立了一种微型化的介观流控-阀上实验室光纤吸收检测传感器装置(FOS-LOV),并应用于水体中亚硝酸盐和余氯污染物的检测。实验优化了载流速度和显色时间等各项实验条件,探讨了检测温度对检测结果的影响,并对检测方法的抗干扰能力进行了测定;在最佳实验条件下,对实际样品和加标回收率进行了测定;将测定样品结果与传统方法进行了对比。结果表明:利用LOV的自动介观流控特征和光纤检测的高灵敏性,有效地减少了分析过程中样品和试剂的消耗,提高了分析速度和检测灵敏度,成功建立了一种自动、准确、快速的在线污染物定量分析方法。论文以光纤表面产生的渐逝场为工作基础,提出了基于渐逝场原理的光纤界面检测方法,并搭建出光纤渐逝场传感器装置。实验利用光纤表面产生的渐逝场与传感试剂发生光学吸收反应,痕量污染物的存在可以引起渐逝场信号的灵敏变化,结合流动注射分析技术,对茶叶样品中无机氟离子含量和废水样品中的Cr(Ⅵ)含量进行高灵敏检测。实验优化了载流速度和显色时间等各项实验条件,探讨了检测温度对检测结果的影响,并对检测方法的抗干扰能力进行了测定;在最佳实验条件下,对实际样品和加标回收率进行了测定;将光纤渐逝场感器测定样品结果与紫外分光光度计所得结果进行了对比。实验结果证明:该方法利用光纤表面产生的渐逝场,将检测和传导介质都集成在单根光纤表面,避免了复杂的光学耦合和调制,成功实现了分析检测的光纤化、微型化和便携化。论文构建的微型化光纤化学传感器检测装置,解决了传统分析检测装置体积庞大、使用环境苛刻等问题,开发了水样中痕量污染物的实时、原位分析检测技术。同时,论文通过模块化设计的现场化传感器检测装置,避免了复杂的样品前处理,简化了水样的保存和运输过程,提升了环境监测的现场水样分析技术,为痕量物质的准确、高灵敏现场检测建立了分析平台。
[Abstract]:The analysis and determination of trace heavy metal ions and inorganic pollutants in water environment is an important branch of modern analytical chemistry. The present large-scale instruments and equipments are only suitable for laboratory use and can not be analyzed in the field. The increasingly serious water pollution events require the development of environmental analysis technology towards the field and portable. In this paper, a micro absorption fiber chemical sensor is constructed by combining optical fiber with spectrum technology. It has the advantages of low transmission loss, large transmission capacity, high sensitivity, miniaturization, strong resistance to electromagnetic interference and corrosion resistance, etc. It is applied to real-time and on-line analysis and detection of trace pollutants in water environment. In this paper, the optical fiber absorption detector of the microupgrade detection cell is constructed, which is integrated into the (LOV) system of the laboratory on the valve, and combined with the microsequential injection analysis technology. A miniaturized mesoscopic flow control-on-valve optical fiber absorption sensor (FOS-LOV) was developed and applied to the detection of nitrite and residual chlorine pollutants in water. The experimental conditions such as carrier current velocity and color reaction time are optimized, and the influence of detection temperature on the detection results is discussed, and the anti-interference ability of the detection method is measured. The actual samples and the recoveries were determined, and the results were compared with the traditional methods. The results show that the automatic mesoscopic flow control characteristics of LOV and the high sensitivity of optical fiber detection can effectively reduce the consumption of samples and reagents in the analysis process, improve the analysis speed and detection sensitivity, and successfully establish an automatic and accurate method. A rapid method for quantitative analysis of pollutants on-line. Based on the evanescent field generated on the surface of optical fiber, this paper presents an optical fiber interface detection method based on the principle of evanescent field, and builds a sensor device of optical fiber evanescent field. In the experiment, the optical absorption reaction between the fading field produced by the optical fiber surface and the sensor reagent is carried out. The presence of trace pollutants can cause the sensitive change of the fading field signal, which is combined with the flow injection analysis technique. The content of inorganic fluoride in tea and the content of Cr (鈪，
本文编号：2225033
[Abstract]:The analysis and determination of trace heavy metal ions and inorganic pollutants in water environment is an important branch of modern analytical chemistry. The present large-scale instruments and equipments are only suitable for laboratory use and can not be analyzed in the field. The increasingly serious water pollution events require the development of environmental analysis technology towards the field and portable. In this paper, a micro absorption fiber chemical sensor is constructed by combining optical fiber with spectrum technology. It has the advantages of low transmission loss, large transmission capacity, high sensitivity, miniaturization, strong resistance to electromagnetic interference and corrosion resistance, etc. It is applied to real-time and on-line analysis and detection of trace pollutants in water environment. In this paper, the optical fiber absorption detector of the microupgrade detection cell is constructed, which is integrated into the (LOV) system of the laboratory on the valve, and combined with the microsequential injection analysis technology. A miniaturized mesoscopic flow control-on-valve optical fiber absorption sensor (FOS-LOV) was developed and applied to the detection of nitrite and residual chlorine pollutants in water. The experimental conditions such as carrier current velocity and color reaction time are optimized, and the influence of detection temperature on the detection results is discussed, and the anti-interference ability of the detection method is measured. The actual samples and the recoveries were determined, and the results were compared with the traditional methods. The results show that the automatic mesoscopic flow control characteristics of LOV and the high sensitivity of optical fiber detection can effectively reduce the consumption of samples and reagents in the analysis process, improve the analysis speed and detection sensitivity, and successfully establish an automatic and accurate method. A rapid method for quantitative analysis of pollutants on-line. Based on the evanescent field generated on the surface of optical fiber, this paper presents an optical fiber interface detection method based on the principle of evanescent field, and builds a sensor device of optical fiber evanescent field. In the experiment, the optical absorption reaction between the fading field produced by the optical fiber surface and the sensor reagent is carried out. The presence of trace pollutants can cause the sensitive change of the fading field signal, which is combined with the flow injection analysis technique. The content of inorganic fluoride in tea and the content of Cr (鈪，
本文编号：2225033
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