轻质油料电导率仪检定方法研究

叙述轻质油料电导率仪的检定原理及检定方法。采用高阻结合标准物质的方法解决了轻质油料电导率仪无法检定的问题。     

轻质油料电导率仪自动检定方法

研究了一种对轻质油料电导率仪进行自动检定的方法。采用模拟高阻技术和视频采集控制软件相结合,减少了人体对检定结果的影响,提高了检定效率和检定结果的可靠性。该方法对研究轻质油料电导率仪的测量参数和相关仪器的特殊测量范围的线性有很大的帮助。     

我国油料产品品质的近红外光谱快速检测技术研究进展

近红外光谱技术是一种快速无损检测技术,具有操作简单、检测成本低、无需化学试剂、绿色环保,以及可实现多品质参数同步检测等优点。该文综述了我国油料和食用植物油品质的近红外光谱速测技术研究进展,包括油料含油量、粗蛋白含量、脂肪酸含量等品质指标,食用油的理化指标,以及脂肪酸和食用油的真实性鉴别,并对油料产品品质的近红外光谱速测技术的发展前景进行了展望。     

一种智能型阻垢剂性能快速评定装置

针对我国目前指导水处理剂阻垢性能评定的化工行业标准HG/T2160-1991——鼓泡法及其评定设备的不足,基于国外上世纪末提出的电导滴定法,研制了一种一体化智能型阻垢剂性能的快速评定装置。该装置基于微机技术应用平台,实现了水处理剂阻垢性能评定的全程自动化:建立了滴定过程中电导率——滴定液容积变化曲线突降点位置的预测算法和相应软件,奠定了阻垢效果的智能评定基础;研制了数据采样间隔自动跟踪、匹配蠕动泵转速的自动滴定装置,提高了滴定分辨率和拐点位置确定精度;自制了高灵敏度、高精密度的半导体温度传感器及其测点位置调节部件,消除了滴定过程中温度对检测评定的干扰;定量确定了测定池系统表面积垢对检测评定的影响,拟定了相应清洗程序。与现有各评定方法和设备相比,本仪器的精准度高、重复性好、评定快捷、操作简便、容重小、能耗小,能更好满足水处理剂生产企业和众多行业用户对水处理剂阻垢性能评定的需求,有望成为鼓泡法评定设备的换代产品。     

一种现场快速检测蛋白氮的检测方法

公开号:CN101368971公开日:2009.02.18申请人:崔杰摘要一种现场快速检测蛋白氮的检测方法,采用iTAG蛋白标签技术的iTAG试剂或考马斯亮蓝法染色试剂或Folin-酚试剂与待检样品快速反应显色后,通过与标准比色卡对比读取样品中蛋白氮的含量。本发明的检测方法,成本远远低于大型精密仪器,且操作简单、方便、快捷,虽然精密度有所不足,但对于食品企业现场收购大量原材料如牛奶时,可以非常快速地得出不同批次的牛奶中的蛋白氮含量,根据其样品显色结果即可直观地得出其真蛋白质(蛋白氮)含量是否达标,适用于大量样品现场粗检测。一种现场快速检测蛋白氮的检测方法     

GC-MS法测定粮谷及油料中55种有机磷农药残留量

采用ASE-300快速溶剂萃取仪提取样品中农药残留量,提取液经二氯甲烷液-液分配、凝胶色谱柱（GPC）净化,固相萃取柱（活性炭）再净化,浓缩定容后,用气相色谱-质谱仪（GC-MS）测定,外标法定量.采用选择离子检测进行阳性确证.选择玉米、糙米、大豆、花生为实验样品、敌敌畏等55种农药添加水平在0.5～2.00 mg/kg时,该方法回收率为68%～117%;精密度为4.04%～11.76%;方法测定低限为0.005～0.100 mg/kg,各项指标均满足有关要求.     

一种基于纳米金化学发光快速检测三聚氰胺的方法

本发明公开了一种基于纳米金化学发光快速检测三聚氰胺的方法,包括以下步骤:(1)移取纳米金溶液和含有三聚氰胺的溶液于一离心管中,充分混匀,作用5 min使得纳米金达到最佳的团聚态;(2)移取纳米金溶液和三聚氰胺溶液的混合溶液于化学发光池中,采用静态注射的方式注入鲁米诺–过氧化氢化学发光试剂,通过IFFL–D流动注射化学发光分析仪测定并记录其化学发光强度,根据测定结果进行判定。本发明检出限为8.6×10–14 g/m L,达到目前固相萃取–化学发光分析法的灵敏度,且较之简单方便;分析测试时间缩短为10 min以内;整个操作实验条件较温和,有利于自动化的分析操作。     

一种蜂蜜中羟甲基糠醛的快速检测方法

本发明公开了一种蜂蜜中羟甲基糠醛(HMF)的快速检测方法,包括如下步骤:(1)样品的制备。准确称取7.5 g蜂蜜样品置于一个小烧杯中,加入10 m L蒸馏水混匀,用玻璃棒搅匀后,转移至25 m L的容量瓶内,加蒸馏水定容至标线,摇匀;(2)显色。取1.00 m L待测样品于具塞刻度试管中,然后向试管中加入3 m L混合溶液,混匀后显色5 min;(3)检测。通过显色后溶液的颜色与比色卡对比,确定出HMF的含量值。本发明具有所用试剂简单、不需要复杂的条件和仪器设备、操作简便、快速的特点。     

一种灰飞虱有机磷杀虫剂抗性快速检测方法

<正>公开号:CN103558375A公开日:2014.02.05申请人:江苏省农业科学院摘要:本发明涉及一种快速检测灰飞虱有机磷杀虫剂抗性的方法,属于生物技术领域。以硝酸纤维素膜为载体,利用酯酶催化α-乙酸萘酯形成萘酯,再与固蓝RR盐发生耦联反应,产生有色物质,然后根据颜色的深浅判断样本是否对有机磷杀虫剂产生抗性。该方法包括硝酸纤维素膜、pH 7.5磷酸缓冲液、pH 6.0磷酸缓冲液、染色液等试剂。     

Effects of Oil on Aqueous Foams: Electrical Conductivity of Foamed Emulsions

Three‐phase foams containing dispersed oils (also called foamed emulsion) are usually encountered in such areas as enhanced oil recovery, food foams, and in foams containing antifoams. The presence of oil causes these complex fluids to exhibit extraordinary properties in contrast to aqueous foams. We experimentally investigated, for the first time, the conductive properties of the foamed emulsions and found that the electrical conductivity increases monotonically with the volumetric liquid fraction, presenting a linear relationship. Combined with the analysis on the foaming capacity and microstructure of this complex fluid, the conductive mechanism is revealed. In these foamed emulsions, the whole conductive network is comprised of two levels of structural hierarchy, which displays a different mechanism from those of the conventional aqueous foams. The lamella of emulsions is taken as primary electrical channel, whereas the secondary electrical channel occurs in the lamella between two bubbles. This conductive behaviour is attributed to the microstructure properties of the foamed emulsions. We believe that such findings are potentially important for a better understanding of the fundamentals of these tri‐phase dispersion systems.     

现代分析检测技术在润滑油氧化中的应用

介绍了近20年来用于润滑油氧化测试中分析检测技术的进展情况,包括高效液相色谱、气相色谱、凝胶渗透色谱、热分析、红外光谱、核磁共振、化学发光及电化学技术,并讨论了今后发展的方向。     

Influence of Electron Donating Ability on Reverse Intersystem Crossing Rate for One Kind of Thermally Activated Delayed Fluorescence Molecules

First-principles calculations are applied for investigating influence of electron donating ability of donor groups in eight thermally activated delayed fluorescence (TADF) molecules on their geometrical structures and transition properties as well as reverse intersystem crossing (RISC) processes. Results show that the diphenylamine substitution in the donor part can slightly change the bond angle but decrease bond length between donor and acceptor unit except for the lowest triplet state (Tbegin{document}$_1$end{document}) of carbazole-xanthone molecule. As the electron donating ability of donor groups is increased, the overlap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) is decreased. As the diphenylamine groups are added in donor part, the delocalization of HOMO is enlarged, which brings a decreased energy gap (begin{document}$Delta E$end{document}begin{document}$_{text{S}_1text{-T}_1}$end{document}) between the lowest singlet excited state (Sbegin{document}$_1$end{document}) and Tbegin{document}$_1$end{document} state. Furthermore, with the calculated spin-orbit coupling coefficient (begin{document}$H_{text{so}}$end{document}), one finds that the larger value of begin{document}$displaystyle{frac{langle S_1|hat{H}_{text{so}}|{T}_1rangle^2}{Delta E_{text{S}_1text{-T}_1}^2}}$end{document} is, the faster the RISC is. The results show that all investigated molecules are promising candidates as TADF molecules. Overall, a wise molecular design strategy for TADF molecules, in which a small begin{document}$Delta E_{text{S}_1text{-T}_1}$end{document} can be achieved by enlarging the delocalization of frontier molecular orbitals with large separation between HOMO and LUMO, is proposed.     

高一学生化学元学习能力调查与对策

对2所中学的高一学生进行问卷调查发现,高一学生化学元学习能力处于中等水平,其中计划性、意识性、方法性、总结性等维度正向比例较低;男生的化学元学习能力水平总体上比女生略高,主要体现在计划性、补救性和总结性等3个维度,但女生的反馈性比男生略高;优秀学生、中等学生和学困生的化学元学习能力存在显著差异。提出鼓励自我设定学习目标培养学习计划性,提高元学习的意识性,加强元学习能力知识和策略的直接指导等措施培养元学习能力。     

Electrical Properties Investigation in PA12/PANI Composites

Summary: Volume conducting PA-12 based composites powders were chemically prepared by in situ polymerization and aniline doping at room temperature. These kinds of polyamide / PANI composites were investigated regarding their electrical properties. Their ac and dc electrical properties measured in the frequency range of 10⁻²–10⁷ Hz are reported and the frequency dependence of electrical conductivity was investigated as a function of PANI concentration leading to the determination of the conductivity. The experimental conductivity was found to increase continuously with PANI content and explained by percolation theory with a relatively low percolation threshold of about 0.4 wt.%. The dielectric behavior of various PANI polymer composites has been characterized by the critical frequency ω_c (denoting the crossover from the dc plateau of the conductivity to its frequency dependent ac behaviour). Modelling the conductivity behavior versus volume fraction using Slupkowski approach has revealed that the considered parameters are not sufficient to describe the electrical conductivity behavior.     

Investigation of electronic transport properties of lanthanides in liquid phase

We investigated electrical transport properties of lanthanide series in liquid phase using the self-consistent approximation employed by Khajil and Tomak [Phys Stat. Sol. B, 134 (1), 321–324 (1986)]. We used our model potential by implemented ionic and atomic radius which is incorporated with the Charged Hard Sphere, One Component Plasma and General Mean Spherical Approximation reference systems to study the electronic transport properties like electrical resistivity (ρ), thermal conductivity (σ) and thermoelectric power (Q). The screening effect on aforesaid properties has been studied by using different screening functions. The correlations of our results and others data within addition experimental values are profoundly promising to the scientists working in this field.     

红花籽油的环氧化工艺

以双氧水为氧化剂,甲酸为氧载体,用强酸性阳离子交换树脂作催化剂,结合正交实验和单因素实验,确定红花籽油环氧化反应的最佳工艺条件为：在少量金属掩蔽剂乙二胺四乙酸二钠（EDTA）存在下,红花籽油、88%甲酸、30%双氧水和阳离子交换树脂的质量比为1∶0.244∶1.665∶0.035,在60 ℃下反应6 h,搅拌速度400 r/min,产品的环氧值可达到7以上。     

智能红外测油仪应用于水质矿物油的测定

将智能红外测油仪应用于水质测试中水样中矿物油的测定,对测定中各影响因素,包括零点的设置,石英吸收皿的选择,四氯化碳质量的挑选以及脱水效率等进行了试验并优化.在所选的条件下对水样中矿物油作了测定,回收率在 99.2%～100.2%之间.     

Comparison of Different Extraction Processes on the Physicochemical Properties,Nutritional Components and Antioxidant Ability of Xanthoceras sorbifolia Bunge Kernel Oil

In this study, we investigated and compared the oil yield, physicochemical properties, fatty acid composition, nutrient content, and antioxidant ability of Xanthoceras sorbifolia Bunge (X. sorbifolia) kernel oils obtained by cold-pressing (CP), hexane extraction (HE), aqueous enzymatic extraction (AEE), and supercritical fluid extraction (SFE). The results indicated that X. sorbifolia oil contained a high percentage of monounsaturated fatty acids (49.31–50.38%), especially oleic acid (30.73–30.98%) and nervonic acid (2.73–3.09%) and that the extraction methods had little effect on the composition and content of fatty acids. X. sorbifolia oil is an excellent source of nervonic acid. Additionally, the HE method resulted in the highest oil yield (98.04%), oxidation stability index (9.20 h), tocopherol content (530.15 mg/kg) and sterol content (2104.07 mg/kg). The DPPH scavenging activity rates of the oil produced by SFE was the highest. Considering the health and nutritional value of oils, HE is a promising method for X. sorbifolia oil processing. According to multiple linear regression analysis, the antioxidant capacity of the oil was negatively correlated with sterol and stearic acid content and positively correlated with linoleic acid, arachidic acid and polyunsaturated fatty acid content. This information is important for improving the nutritional value and industrial production of X. sorbifolia.     

油品光催化深度脱氮技术研究进展

油品中的氮化物影响油品稳定性、储运安全及二次加工工艺等。近年来,油品脱氮成为解决环境污染和能源短缺的研究热点之一。现炼油厂脱氮技术虽成熟,但成本大、能耗高。光催化技术进行油品脱氮具有安全无毒、环境友好、高稳定性、高催化活性、低能耗等优点,备受人们的瞩目。本文介绍了催化技术在燃料油品脱氮领域的发展进程及研究现状,包括针对金属氧化物催化剂、分子筛催化剂体系进行载体优化和催化剂改性研究等,期望能对新型改性纳米光催化剂制备及其在油品深度脱氮领域高效率和高性能应用提供参考。