基于氧猝灭的有机改性溶胶-凝胶微生物传感器测定BOD的研究

通过有机改性溶胶凝胶PVA包埋方法固定微生物菌株，以氧光化学传感器作为二次传感，制备了响应良好的光化学BOD微生物传感器．在此基础上，考察了微生物传感膜的活化浓度、温度、pH、无机盐及部分金属离子对传感器响应的影响．并对传感器的重现性、储存稳定性和线性范围进行了考察，实验结果表明BOD含量在0—100mg/L浓度范围内与传感器的荧光值成线性关系，传感膜的响应活性保持较好，具有较长的使用寿命和良好的稳定性．     

Nylon 6,6 modified screen printed carbon electrodes as electrochemical sensors for rapid chlorothalonil determination in water samples using differential pulse cathodic stripping voltammetry

A newly developed electrochemical sensor for chlorothalonil based on nylon 6,6 film deposited onto screen printed electrode (SPE) with electrochemical modulation of pH at the electrode/solution interface was studied for the first time. Differential pulse cathodic stripping voltammetry (DPCSV) was used to carry out the electrochemical and analytical studies. Experimental parameters such as accumulation potential, initial potential, accumulation time and pH of Britton-Robinson buffer have been optimized. Chlorothalonil gave optimum analytical signal in a medium of 0.04?M Britton-Robinson buffer at pH 6.0. A well-defined reduction peak was observed, at E_p= ?0.851 and ?0.938?V vs. Ag/AgCl (3.0?M KCl) for both bare SPE and modified SPE, respectively. The peak currents of modified SPE were significantly increased as compared to bare SPE. At the modified SPE, a linear relationship between the peak current and chlorothalonil concentration was obtained in the range from 0.1 to 2.8?×?10^?6?M with a detection limit of 1.53?×?10^?8?M (S/N=?3). The practical applicability of the newly developed method has been demonstrated on analyses of real water samples. The newly developed sensor shows good reproducibility with RSD of 3.92%. The nylon 6,6 modified SPE showed itself as promising sensor with good selectivity for chlorothalonil determination.     

基于二氧化钛纳米管有序阵列的氢气探测

基于气体传感器对H_2的泄漏进行探测监控,可以有效预防和控制H_2火灾爆炸事故的发生。通过阳极氧化法制备了高度有序的二氧化钛(TiO_2)纳米管阵列并制成气体传感器元器件,研究其在空气气氛中对H_2的气敏特性。通过粉末X射线衍射(XRD)、扫描电子显微镜(SEM),透射电子显微镜(TEM)表征手段研究了TiO_2纳米管的相组成和微观结构。TiO_2纳米管具有优异的气敏性能,可在200℃以上对H_2进行有效探测,检测极限达到20ppm。325℃对1 000ppm H_2灵敏度为446,响应时间为2s,对H_2选择性好。     

PREDICTING WILDERNESS SNOW WATER EQUIVALENT WITH NONWILDERNESS SNOW SENSORS1

ABSTRACT: Ten pairs of snow sensors were analyzed to investigate the feasibility of predicting snow water equivalent at high-elevation, telemetered snow sensor sites from lower-elevation sensors. The need for this analysis stems from an agreement between the California Department of Water Resources and the USDA Forest Service to temporarily allow snow sensors in California's wilderness areas so that a predictive relationship can be developed. After 10 or 15 years, the agreement calls for the sensors to be removed. Initial efforts to a priori select sensor pairs were based on proximity, colocation within a basin, and annual precipitation amount, but regression yielded poor fits (R² < 0.65) and high standard errors in eight of the ten cases. Analysis of the results suggested that eleva-tional similarity was the most important selection criteria, and that all available sensors near the target site should be analyzed via a regression screening. Using elevation for selection and the regression screening, five sensors that initially had poor fits were reanalyzed. Each of the five sensors was paired with between two and five new sensors, and R² values improved between 27 and 46 percent. Various data smoothing and editing algorithms were evaluated, but they rarely resulted in improved fits.     

水中六价铬光纤传感检测方法的研究

探讨光纤传感检测探头的原理,建立适应现场检测水中六价铬的方法。水中Cr6+与二苯基碳酰二肼反应生成紫红色产物,光纤探头插入水样中进行测定。其检测浓度范围为0.04～1.0mg/L,最低检出限为0.04mg/L。采用光纤传感测定水中六价铬,为野外和在线检测提供一种新方法。     

一种新型CO气敏双层薄膜材料

介绍了一种新型结构 CO气敏的半导体薄膜材料——粉末溅射方法制备的表面层掺杂 Sn O2 /Sn O2 ∶ Pt双层膜的气敏特性。分析了双层膜中的导电层厚度对气敏特性的影响 ,并对气敏机理的有关问题进行了讨论     

基于厚膜传感器的空气质量监测仪性能及应用研究

介绍了一种基于厚膜传感器技术,可同时测量NO2、O3、CO三个因子的空气质量监测仪器。深入研究了仪器的检测原理,并对仪器的质量保证及数据存储传输进行了详细介绍。最后对仪器的检测性能进行了对比分析,通过和常规点式仪器的对比表明,该仪器NO2、O3、CO三因子的检测性能能够满足实际监测要求。另外,该仪器还具有集成性好、安装调试方便等特点,因此,在道路交通监测等领域中有广泛的应用前景。     

工业温室气体CO2排放监测技术前期研究

介绍了国内外二氧化碳（ CO2）气体检测方法,选取红外传感器、非分散红外和气相色谱3种方法监测工业燃煤废气中的CO2。试验结果表明,3种方法的精密度和准确度均满足要求;单一燃煤废气中CO2的体积分数范围为6．70％～15．10％,同一排气筒中CO2体积分数5 min的波动范围为0～22．4％;同一排气筒（单一燃煤废气）中CO2和O2的体积分数有一定的关联性,二者之和基本稳定在19％～21％范围;非分散红外法和气相色谱法测定同一样品的相对偏差为0．9％～3．4％;红外传感器适用于有组织排放的现场监测,另2种方法适用于无组织废气和环境空气监测。     

基于无人机平台的甲烷监测技术及其在油气行业的应用

对甲烷排放的精准监测是油气行业实现温室气体减排与管控的基础和前提。无人机具有灵活、可操作性强、覆盖范围广、运行成本低等特点,以无人机为飞行平台的甲烷监测技术在油气行业区域甲烷排放监测领域具有巨大的应用潜力。详细阐述了基于无人机平台的甲烷监测技术的优势,梳理了不同的无人机类型,并根据其飞行性能及载荷能力进行了比对,归纳了无人机有效载荷类型、特点及应用场景,总结了国内外无人机甲烷监测技术在油气行业的应用,旨在为基于无人机平台的甲烷监测技术在我国油气行业的应用提供理论和技术参考。     

浊度传感器应用于连续监测污水厂进水悬浮颗粒浓度的研究

为使城市污水处理厂更合理高效的运营,可对进水悬浮颗粒浓度的实时监测来实现。通过对进水水样的悬浮颗粒浓度测量值与相应浊度值建立的关系曲线,达到对污水处理厂进水悬浮颗粒浓度（mg／L）的连续实时监测。文中给出了浊度传感器的校准方法,并建立浊度-悬浮颗粒浓度关系曲线,将其应用于某城市污水处理厂,得到单位时间进水悬浮颗粒总量的实时连续图。