共查询到18条相似文献,搜索用时 62 毫秒
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光纤氧传感器的研制及对溶解氧的测定 总被引:2,自引:0,他引:2
1 引 言 基于荧光熄灭的光纤氧传感器在环保、工业、医药、生化等领域有着广泛的应用前景。水中溶解氧的浓度是水质监测的一项重要指标,经典测定方法为碘量法。本文用自行合成的荧光试剂研制了光纤氧传感器,考察了增塑剂对膜响应特性的影响以及传感器的工作条件和干扰情况,同时对不同样品的溶解氧进行了测定,并与碘量法的测定结果进行了对比,经配对t检验,结果无显著性差异。2 实验与结果2.1仪器和试剂 RF-5000荧光分光光度计(日本岛津公司),双臂石英光纤束(北京玻璃研究院加工),LM-1型测氧仪(中国科学院… 相似文献
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伏安式多酚氧化酶电极的研究 总被引:1,自引:0,他引:1
本报道了一种能性能良好的以吩嗪甲酯(PMS)修饰的玻碳电极为基体电极的优安式多酚氧化酶电极。采用从蘑菇中粗提取的多酚氧化酶固定於电极表面,可用循环伏安法测定5×10^-^7mol/L的多巴胺。本首次采用丙烯酸丁酯-丙烯酸甲酯共聚乳液固定酶,所制得电极性能与戊二醛交联法所得电极基本相同。在降低电极充电电流方面,采用半微分技术使电极性能得到很大改善,测定灵敏度达到2.5×10^-^7mol/L,且 相似文献
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本文研制了新型二氧化碳电流传感器,监测二氧化碳的浓度在0-10%,对二氧化碳的选择性优于其他二氧化碳传感器;合成了1,3-二氧基丙烷全铜(Ⅱ)配合物,对其组成、IR、TG进行了研究,讨论了配合物的可能结构及其在传感器中的作用机理。 相似文献
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一种利用离子交换膜研制的电化学氧传感器 总被引:5,自引:0,他引:5
利用聚苯乙烯阴离子交换膜研制的金为催化剂,采用碱性体系的新型控制电位电解型氧传感克服了以往电化学氧传感器的缺点,具有响应时间快、稳定性好、噪声低、本底电流小、温度系数低等优点。 相似文献
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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. 相似文献
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A simple but highly snesitive electrochemical sensor for the determination of dihydromyricetin (DMY) based on graphene‐Nafion nanocomposite film modified Glassy carbon electrode (GCE) was reported. The characteristic of the sensor was examined by scanning electron microscopic (SEM) and electrochemical impedance spectroscopy (EIS). Compares with bare GCE, pre‐anodized glassy carbon electrode (GCE(ox)) and Nafion modified electrode, the sensor exhibited the more superior ability of detecting DMY, due to the synergetic graphene and Nafion. Other, the dependence of the current on pH, instrumental parameters, accumulation time and potential were investigated to optimize the experimental conditions in the determination of DMY. Under the selected conditions, the response peak currents were linear relationship with the DMY concentrations in the range of 8.0 × 10?8 ~ 2.0 × 10?5 mol L?1 with a detection limit of 2.0 × 10?8 mol L?1. And, the method was also applied successfully to detect DMY in Ampelopsis grossedentata samples. 相似文献
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《Analytical letters》2012,45(11):2005-2010
Abstract A new type of amperometric sensor for oxygen, having a O. 1M solution of LiCl in ethanol as internal electrolyte, was developed The response characteristics of this sensor have been improved in comparison with similer sensors based on internal electrolyte in aqueous media, reported in literature. Preliminary results on the response characteristics of the new sensor are reported. 相似文献
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IntroductionC1ark[l]wasthefirsttocoupleanelectrochemicalsensorwithgaspermeablemembrane,e.g.,polyethylenemembraneforbloodanalysis'Thistypeofmem-brane-coveredsensoLshasfoundwideapplications.TheoxygenpermeabilityofthemembraneandgeometryofthecathodearegenerallyconsideredtobethemainfactorsincontrollingthecharacteristicsofClark-typesensors[2j.Sawyeretal.[3Jdevelopedquantitativemethodsfortheanalysisofoxygenandsulfurdiox-ideinthegasphaseaswellasinsolutionusingeitherpolyethyleneorTeflonmembranes.Them… 相似文献
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Taher Alizadeh 《Electroanalysis》2009,21(13):1490-1498
The design and construction of an extra high selective voltammetric sensor for parathion by using a molecularly imprinted polymer (MIP) as recognition element was introduced. A parathion selective MIP and a nonimprinted polymer (NIP) were synthesized and then incorporated in the carbon paste electrode. The MIP‐CP electrode showed very high recognition ability in comparison to NIP‐CP. It was shown that electrode washing after parathion extraction, led to enhanced selectivity. Some parameters affecting the sensor response were optimized and then the calibration curve was plotted. A dynamic linear range of 1.7–900 nM was obtained. The detection limit of the sensor was calculated as 0.5 nM. This sensor was used successfully for parathion determination in real samples such as ground water and vegetables. 相似文献
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一种基于氢氧反应热的催化氧气传感器 总被引:1,自引:0,他引:1
基于对氢氧反应热的测量 ,设计了1种测量气体中微量氧气含量的传感器 ,它由嵌入反应池的微型薄膜铂电阻 ,氧化锰 -钯催化剂构成 ,铂电阻构成惠斯顿电桥 ;在催化剂作用下 ,氢氧反应放热使反应池内温度升高 ,引起铂电阻值变化 ,使电桥偏移产生响应信号 ;采用直通全消耗微反应池 ,待测氧气可被完全利用 ,使用参比池和恒温装置减小环境温度和湿度波动影响 ;设计的传感器对1~1200×10 -6(w)的氧气呈线性响应 ,定量下限为1×10-6(w) ,90%信号响应时间小于5s;该传感器具有结构简单、响应迅速、灵敏度高、稳定性好等特点。 相似文献
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Sodium nitroprusside (NP), a commercial vasodilator, can be pre‐concentrated on vitreous carbon electrode modified by films of 97.5%: 2.5% poly‐L ‐lysine (PLL): glutaraldehyde (GA). This coating gives acceptable anion exchange properties whilst giving the required improvement of adhesion to the glassy carbon electrode surface. Linear response range and detection limit on nitroprusside in B‐R buffer pH 4.0, were 1×10?6 to 2×10?5 mol L?1 and 1×10?7 mol L?1, respectively. The repeatability of the proposed sensor, evaluated in term of relative standard deviation, was measured as 4.1% for 10 experiments. The voltammetric sensor was directly applied to determination of nitroprusside in human plasma and urine samples and the average recovery for these samples was around 95–97% without any pre treatment. 相似文献