光纤氧传感器技术进展

综述了近年来国内外光纤氧传感器技术的研究及应用情况,探索了光纤和荧光指示剂的进展,阐述了氧传感技术和制作氧传感膜的机理及光纤氧传感器的应用情况,并展望了光纤氧传感器的发展趋势。     

液相化学发光法测定水中溶解氧

以碘－鲁米诺化学发光反应作指示反应,与碘量法相结合,提出了测定水中溶解氧的新方法。该方法具有试样用量较钞,准确度较高的特点,用于水样中溶解氧的测定,结果满意。     

吸光光度法测定裂解气压缩机注水中溶解氧

提出了测定裂解气压缩机注水中溶解氧含量的吸光光度法。测定波长为600 nm。溶解氧浓度在10~100μg·L-1范围内与吸光度呈线性关系,检出浓度为2μg·L-1。方法简便、灵敏、准确,可用于直接测定水样中的溶解氧。     

水中溶解氧的测定

对近年来有关水中溶解氧的各种主要测定方法作了简介和评述,并重点介绍了传感器法的现状和发展趋势。     

水中溶解氧的测定

用微型滴定法对湖泊水中溶解氧进行了测定,实验结果对湖泊水质分析有一定的参考价值。     

PVB-联吡啶钌氧敏感膜荧光光度法对非水溶剂中微量溶解氧的测定

以聚乙烯醇缩丁醛(PVB)为共聚前驱体,联吡啶钌([Ru(bpy)3]Cl2·6H2O)为氧荧光指示剂,制备了一种新型氧敏感膜,据此建立了采用流动注射荧光光度法测定非水溶剂中微量溶解氧的新方法.在涂膜液中联吡啶钌浓度为1 mmol/L,涂膜液用量为2.5 mL,20 ℃下放置24 h,40 ℃恒温干燥48 h时,制备的氧敏感膜(膜厚0.5 mm)对氧响应的灵敏度最高.当激发波长为465 nm,溶液流速为1.0 mL/min时,该敏感膜对氧有较快的响应时间、良好的响应可逆性、较好的稳定性.对1,2-丙二醇和PEG-400中溶解氧的测定结果表明,两者的Stern-Volmer曲线的线性范围分别为0 ～69.12 mg/L和0 ～109.54 mg/L,检出限分别为4.25 mg/L和0.56 mg/L,RSD(n=6)分别为2.0%和1.8%.     

高灵敏度二氧化硫光纤传感器的研究

以奎宁为荧光试剂,通过改变传感液膜的组成及采用非稳态测量法,研制成功高灵敏度的二氧化硫光纤传感器,该传感器的线性响应范围为3.1×10^-7～7.8×10^-5mol/L,检测限达1.6×10^-7mol/L.研究了内充液中NaHSO₃浓度、内充液层厚度对该光纤传感器动态响应信号的影响,用该传感器测定了葡萄酒中游离二氧化硫的含量,结果令人满意.     

光学氧传感器的研制

本文根据氧分子能有效地猝灭金属有机络合物的荧光的原理，研制了一种氧传感器。     

酶法测定水中的尿素含量

利用脲酶、谷氨酸脱氢酶偶联催化尿素水解的原理,通过测定还原型烟酰胺腺嘌呤二核苷酸吸光度变化率得出其酶促反应速度,对应不同的尿素浓度制得标准曲线,讨论了ｐＨ值和抑制剂对测定的影响,实测了水样中尿素的含量。     

Characterization of Optical Fiber Dissolved Oxygen Sensor for Aquaculture Sensing and Monitoring

Optical fiber sensor using sol gel membrane incorporated RTV silicon rubber was fabricated and developed for the characterization of dissolved oxygen in aqueous solution. The sol gel materials used consists of Tetraethylorthosilicate (TEOS) and Triethoxyoctylsilane (Octyl-triEOS) as the precursor compound for the preparation of the sol gel structures, while tris-BP Ruthenium (II) chloride as the fluorescent lifetime of the oxygen indicator. Dip coating techniques is utilized to position the sol gel technology at the distal end of the optical fiber. Dissolved oxygen gas sensor characterizations include a study on the sensitivity, temperature effects and drift rate of the sensor performance when measured in 40ppt salt water. Potential applications of the optical fiber sensor are including aquaculture, river monitoring and environment sector.     

A Dissolved Oxygen Analyzer with an Optical Sensor

A serial analyzer of dissolved oxygen, Expert-009, based on the optical detection method is created. The sensitive element of the sensor is a polymer film with a dye—a metal complex of fluorine-substituted porphyrin—distributed in it. The method is based on the quenching of the phosphorescence of the dye by molecular oxygen, which the analyzer recounts to the concentration value by the calibration curve method. The metrological characteristics of the analyzer are determined.     

Polarographic Behavior of Gemfibrozil in the Presence of Dissolved Oxygen and Its Analytical Application

The polarographic behavior of gemfibrozil is investigated in 0.2 mol L^?1 KH₂PO₄‐Na₂HPO₄ (pH 5.8±0.1)‐8% ethanol supporting electrolyte in the absence and the presence of dissolved oxygen. The results demonstrate that the polarographic reduction peak at ca. ?1.17 V is a catalytic hydrogen wave after deaeration, and the enhanced reduction peak in the presence of dissolved oxygen is the so‐called parallel catalytic hydrogen wave. Based on the parallel catalytic hydrogen wave, a novel method has been developed for the determination of gemfibrozil by single sweep polarography. Calibration plot is linear in the range of 1.8×10^?7–2.4×10^?6 mol L^?1 and detection limit is 9.0×10^?8 mol L^?1. The proposed method is applied to the direct determination of the gemfibrozil in pharmaceutical preparations. The proposed method is simpler, faster and more sensitive than the known methods for gemfibrozil analyses.     

Optical and Electrochemical Combination Sensor with Poly‐Aniline Film Modified Gold Surface and Its Application for Dissolved Oxygen Detection

Poly‐aniline (PAn) film can be oxidized by contacting oxygen in an electron‐transfer reaction and its redox state, for instance the open circuit potential and the dielectric constant, is quantitatively related to oxygen concentration. This feature may contribute to an improved application of dissolved oxygen (DO) detection with the combined optical and electrochemical sensor. In this paper, PAn is used as a sensing surface to detect DO by the combination sensor composed of electrochemistry and total internal reflection imaging ellipsometry (EC‐TIRIE). Results demonstrate that both optical and electrical signals show a logarithmic correlation with DO concentration (0–20 ppm). Compared with the results obtained only with the gold surface, both the optical and electrical signals of the EC‐TIRIE sensor for DO detection are amplified with the PAn modified gold surface.     

Optical Sol-Gel-Based Dissolved Oxygen Sensor: Progress Towards a Commercial Instrument

A dissolved oxygen sensor based on fluorescence quenching of the oxygen-sensitive ruthenium complex, [Ru(II)-tris(4,7-diphenyl-1,10-phenanthroline]2+, which has been immobilized in a porous silica sol-gel-derived film, is reported. Ormosil sensing films were fabricated using modified silica precursors such as methyltriethoxysilane (MTEOS) and ethyltriethoxysilane (ETEOS) and were dip-coated onto planar glass substrates. Tailoring of the films for dissolved oxygen (DO) sensing is described whereby sensor response is optimized by maximizing film hydrophobicity by the use of the modified precursors. Sensor performance parameters such as limit of detection and sensor resolution are reported. Issues such as dye leaching and photobleaching are discussed. Progress towards a commercial instrument is reported.     

一种新型卟啉修饰电极的循环伏安研究及溶解氧的测定

本文将尾式金属卟啉氯化5-邻(N-咪唑)丁氧基苯基10,15,20三苯基卟啉Mn(Ⅲ)(Mn(Ⅲ)(ImBPTPP)Cl)修饰于玻碳电极表面,用循环伏安法(CV)研究了修饰电极的电化学性质,并用微分脉冲伏安法(DPV)测定水中溶解氧的含量。本法的检出限为0.1 mg/L,线性范围为0.38~12 mg/L,相关性系数R=0.999(n=11),实际样品测定的相对标准偏差(RSD)为1.43%(n=5)。该修饰电极有望作为检测溶解氧的传感器。     

液芯光纤预共振和共振喇曼光谱及其应用

在液芯光纤内产生预共振和共振喇曼效应，可大度提高喇曼光谱强度，用波长远离样品吸收峰的激光激发观察到了α－甲基吡啶的预共振喇曼光谱。用长１．１ｍ，内径２００μｍ的液芯光纤，波长５１４．５ｎｍ，功率０．８０Ｗ激光激发获得了β－胡萝卜素在ＣＳ２中的共振喇曼光谱，其浓度为２×１０＾－８ｍｏｌ／Ｌ，比普通方法的样品的浓度低２－３个数量级。     

A Simple and Inexpensive Method for Fabrication of Ultramicroelectrode Array and Its Application for the Detection of Dissolved Oxygen

Herein, we report a simple and inexpensive way for fabrication of ultramicroelectrode arrays (UMEAs) and the relative characterization methods. The fabrication of UMEAs involves only a few steps of handwork. Since only metal wires and epoxy are used through the fabrication process, it is supposed to be a quite straightforward method for preparing UMEAs. A dissolved oxygen (DO) sensor based on UMEAs was constructed. The detection of DO in different aqueous samples is fast, reliable and reproducible. The surface of UMEAs fabricated can be renewed simply by mechanically polishing or electrochemical treatment, which is of great advantage to practical applications.     

四对溴苯基铂卟啉聚氯乙烯敏感膜溶解氧传感器的研究

介绍了四对溴苯基铂卟啉的合成及以它为敏感材料,以PVC粉为支持体系的光学溶解氧传感器的响应特性。该敏感膜的最大激发波长与发射波长分别为402nm和664nm,并具有良好的稳定性、重现性;其对溶解氧的响应值I0／I=15,其中I0是敏感膜在5％亚硫酸钠溶液制备的无氧水中的荧光强度,I为其在空气饱和的水中的荧光强度。该敏感膜有较好的灵敏度,并用于实际水样的溶解氧测定,结果令人满意。