铀钍稀土络合物量热滴定的数据处理及程序设计

利用计算机控制的微量量热滴定仪,研究铀、钍、稀土的多元络合反应,测定反应过程中热量,可求得相应各项热力学函数。由于实验数据量大,待定参数多,本文提出用优选法的最小二乘法处理实验数据及程序设计。如迭代精度为ε,则S个待定参数的迭代次数为S~2lglg(1/ε)数量级,用FORTRAN语言在每秒57万次的ACOS-150型机上运行,计算时间不超过五分钟。本法及设计也可适用于其它类型的实验数据处理。     

浅析库仑滴定法测定全硫准确度的影响因素

分析了库仑滴定法测定全硫过程中易出现的问题，提出了改进意见和注意事项。     

基于神经网络的转炉冶炼终点硫含量预报模型

通过研究转炉冶炼终点硫含量的影响因素,确定了预报模型的控制变量,对常用的BP算法进行改进,建立了基于神经网络的终点硫含量预报模型.模型的预报结果接近动态控制模型的预报精度.     

2-(5-氯-2-吡啶偶氮)-5-二乙基氨基酚作指示剂络合滴定连续测定铜和锌

在pH 5.5的HAc-NaAc缓冲溶液中,以2-(5-氯-2-吡啶偶氮)-5-二乙基氨基酚(5-Cl-DEPAP)为指示剂,EDTA标准溶液滴定铜、锌,滴定终点颜色变化敏锐,准确度较高,铜和锌量各在0~25 mg范围内与EDTA消耗量成正比,铜、锌质量比在1∶10~10∶1范围内相互无影响。方法用于合成样品中铜、锌的连续测定,结果满意。     

EDTA滴定法测定复杂铜阳极泥中铋

铜阳极泥成分受电解工艺参数、阳极板质量、现场控制等多种因素的影响,元素种类和含量复杂多变。采用EDTA滴定法检测含高铅、高钡的复杂铜阳极泥中铋时,样品溶解过程常出现不溶结块,从而易对铋形成包裹,导致测定结果误差大、稳定性差。实验采用王水-硫酸溶解样品,在硝酸介质中用EDTA滴定法检测铋含量。通过试验确定称样量为0.2~1.0g并满足溶液中铋质量浓度不小于140mg/L,以硝酸-酒石酸混合酸作为浸取酸,调节溶液pH值至1.5~1.7,用1.060×10^-2 mol/L EDTA标准溶液测定铋,终点敏锐。按照实验方法测定铜阳极泥实际样品中铋,测定结果的相对标准偏差(RSD,n=9)为0.86%~1.5%,回收率为98%~101%。方法有效解决了复杂铜阳极泥中的铋量不易准确测定的问题,适用于铋含量为1%~12%(质量分数)的复杂铜阳极泥样品的检测。     

The Schulman Method of Cosurfactant Titration of the Oil/Water Interface (Dilution Method): A Review on a Well‐Known Powerful Technique in Interfacial Science for Characterization of Water‐in‐Oil Microemulsions

Microemulsions are thermodynamically stable, isotropic transparent mixtures of two immiscible liquids (polar and nonpolar) and amphiphile(s) (usually surfactant and/or cosurfactant). The cosurfactant plays an important role by blending with surfactants, and partitioned between the coexisting aqueous and oleic phases to control the bending elasticity of the interfacial layer to render stability to the dispersion. The microheterogeneity of such dispersions makes them useful in biological and technological applications. Various techniques viz., conductance, interfacial tension, SANS etc. were applied to estimate the distribution of cosurfactant between the interface and the bulk oil. However, a simple but ingenious method comprising repetitively oil dilution with cosurfactant titration till attainment of stable microemulsions was also used to measure the distribution of cosurfactant. This review summarizes formation and characterization of water‐in‐oil microemulsions stabilized by single or mixed surfactants of different charge types and polar head groups or mixed surface active ionic liquid and surfactant, and cosurfactants of different lipophilicities in both hydrocarbons and long chain alkyl ester oil, emphasizing interfacial composition, thermodynamics of formation and structural parameters by the dilution method coupled with transport properties, microstructures and states of water organization inside the pool etc. using instrumental techniques. Applicability of the data obtained from dilution method in different areas, viz. nanomaterial synthesis, enzyme activity, etc. have been reported. Indeed, this article presented a journey of development and significant contribution in utilizing this elegant and inexpensive method to accomplish the formation of microemulsion through consistent motivation by researchers of different countries.     

EDTA法测水泥含量的应用

阐述了EDTA滴定法的概念 ,详细介绍了EDTA滴定法快速测定水泥稳定土中水泥剂量的方法 ,指出考虑了龄期因素影响的修正曲线并利用其对滴定结果修正 ,能较好地保证补测结果的准确性。     

EDTA滴定法中酒石酸钾钠用量对铟分析的影响

为防止铟水解和保证EDTA滴定法能在酸性条件下进行滴定 ,分析铟靶材废料盐酸浸出液时酒石酸钾钠用量对铟含量测定的影响。试验表明 ,酒石酸钾钠用量过多或过少都会导致分析结果偏低。在铟含量为 (5～5 7) g/L范围内 ,加入 30 %酒石酸钾钠溶液 10mL ,在pH值为 2 .5时 ,可防止分析过程中铟的水解和酒石酸盐的沉淀析出 ,分析误差小于± 0 .1%。     

不同方法制得镍锌铁前驱物的水热对比实验研究

氧化法和中和法是水热制备铁氧体前驱物的两种常见方法。通过对这两种方法制得前驱物进行水热处理分析得知,氧化法水热粉体的磁性能较好,细颗粒较多,晶体发育较好,但工艺和操作较困难。     

交流示波极谱滴定法测定岩矿中的钍

在ｐＨ１—２的盐酸溶液中，用标准ＣｕＳＯ４溶液返滴法测定Ｔｈ，以ＣＵ２＋在交流示波极谱曲线ｄＥ／ｄｔ＝ｆ（Ｅ）上出现切口直接指示终点。Ｔｈ量分析范围为１．００—２０．００ｍｇ，方法回收率为９９．０％－１００．３％。对于含Ｔｈ０．６５％以上的试样分析１０次的相对标准偏差为０．１５％－１．５５％。