3,5-间苯二甲酸二甲酯磺酸钠母液中硫酸含量的快速测定

本文研究了用铅离子选择电极作指示电极电位滴定法快速测定3,5-间苯二甲酸二甲酯磺酸钠(SIPM)母液中硫酸含量的分析方法,为了减少对环境的危害,做到达标排放,需对硫酸的含量进行测定,以对母液进行控制.试验证明采用铅离子选择电极电位滴定法测定该体系的硫酸根,不仅能满足工艺中间控制的要求,而且操作简单,省时,费用也低,扩大了铅离子选择电极的应用范围.     

微波消解-微分电位溶出法测定淡水鱼中镉含量

为镉的检测寻求一种快速、简便的新方法。通过玻碳悬汞电极测定淡水鱼中镉含量,考查了电沉积电位、电沉积时间、平衡电位、平衡时间对测定结果的影响。结果：当pH值为1.0～2.5、电沉积电位为-1.25V、电沉积时间为60s、平衡电位为-1.0V、平衡时间为30s时,测定结果最好。测定镉的线性范围为0～16ng,检出限为0.24ng/mL,回收率为98.6%～101.2%,相对标准偏差为2.4%。该法操作快速、简便,结果准确、可靠。     

Neurochip based on light-addressable potentiometric sensor with wavelet transform de-noising

Neurochip based on light-addressable potentiometric sensor(LAPS),whose sensing elements are excitable cells,can monitor electrophysiological properties of cultured neuron networks with cellular signals well analyzed.Here we report a kind of neurochip with rat pheochromocytoma(PC12) cells hybrid with LAPS and a method of de-noising signals based on wavelet transform.Cells were cultured on LAPS for several days to form networks,and we then used LAPS system to detect the extracellular potentials with signals d...     

再论两点电位滴定法在实验教学中的应用

前文提出了用两点电位滴定法测定天然水氯化物,该文进一步论述两点法在实验教学中的应用,分析速度较经典电位滴定法有较大提高。用于教学省时省力。     

Response enhancement of olfactory sensory neurons-based biosensors for odorant detection

This paper presents a novel strategy for the response enhancement of olfactory sensory neurons (OSNs)-based bio-sensors by monitoring the enhancive responses of OSNs to odorants. An OSNs-based biosensor was developed on the basis of the light addressable potentiometric sensor (LAPS), in which rat OSNs were cultured on the surface of LAPS chip and served as sensing elements. LY294002, the specific inhibitor ofphosphatidylinositol 3-kinase (PI3K), was used to enhance the responses of OSNs to odorants. The responses of OSNs to odorants with and without the treatment of LY294002 were recorded by LAPS. The results show that the enhancive effect of LY294002 was recorded efficiently by LAPS and the responses of this OSNs-LAPS hybrid biosensor were enhanced by LY294002 by about 1.5-fold. We conclude that this method can enhance the responses of OSNs-LAPS hybrid biosensors, which may provide a novel strategy for the bioelectrical signal monitor of OSNs in biosensors. It is also suggested that this strategy may be applicable to other kinds of OSNs-based biosensors for cellular activity detection, such as microelectrode array (MEA) and field effect transistor (FET).     

关于氯甲基膦酸性质的研究

介绍氯甲基膦酸的合成方法、纯品的制备和主要用途以及氯甲基膦酸的物理化学性质.重点是对该化合物的酸性进行了研究,利用电位滴定法绘出了滴定曲线.研究表明,氯甲基膦酸为二元酸,可以进行二级电离.在测定温度(27℃)下,其浓度平衡常数Kα_1和Kα_2分别为1.29×10~(-2)、6.82×10~(-7);活度平衡常数K’α_1和K’α_2分别为1.26×10~(-2)和6.51×10~(-7).     

基于USB高精度数据采集对自动电位滴定仪的数字化改造

基于USB高精度数据采集对自动电位滴定仪进行数字化改造,设计了一个数据采集与处理系统,实现了电位滴定中数据的精确实时采集、显示和处理。利用该系统进行电位滴定分析实验,得到了准确、稳定和可靠的结果。     

电位滴定法测定吡啶－三苯基硼中硼的含量

利用自动电位滴定法测定化工产品吡啶－三苯基硼中硼的含量。对消解体系中硝酸－硫酸比例、温度、消解时间等条件,以及硼酸酸性强化剂甘露醇用量等进行了优化。在优化的消解和电位滴定条件下,测得本批次产品中硼的平均值含量为3．32％,纯度为98．52％。方法标准偏差为9．97％,回收率91．9％～109．6％。此方法简单、方便可行,测定结果稳定。     

A non-labeled DNA biosensor based on light addressable potentiometric sensor modified with TiO2 thin film

Titanium dioxide (TiO_2) thin film was deposited on the surface of the light addressable potentiometric sensor (LAPS) to modify the sensor surface for the non-labeled detection of DNA molecules. To evaluate the effect of ultraviolet (UV) treatment on the silanization level of TiO_2 thin film by 3-aminopropyltrietboxysilane (APTS), fluorescein isothiocyanate (FITC) was used to label the amine group on the end of APTS immobilized onto the TiO_2 thin film. We found that, with UV irradiation, the silani-zation level of the irradiated area of the TiO_2 film was improved compared with the non-irradiated area under well-controlled conditions. This result indicates that TiO_2 can act as a coating material on the biosensor surface to improve the effect and effi-ciency of the covalent immobilization of biomolecules on the sensor surface. The artificially synthesized probe DNA molecules were covalently linked onto the surface of TiO_2 film. The hybridization of probe DNA and target DNA was monitored by the recording of Ⅰ-Ⅴ curves that shift along the voltage axis during the process of reaction. A significant LAPS signal can be detected at 10 μmol/L of target DNA sample.     

电位滴定法测定硫酸亚铁溶液浓度实验的改进

针对电位滴定法测定硫酸亚铁溶液浓度实验的不足对实验进行了改进,改进后的实验结果表明,仪器读数稳定,数据重现性好,实验结果准确度高,适合用于学生实验教学。