The competitive interactions between the anion-receptor, anions and neutral solvent species

In this article, studies on coordinative properties of 5,11,17,23-tetra-p-tert-butyl-25,27-bis(N-p-nitrophenylureido-butoxy)-26,28-dipropoxycalix[4]arene (Cx2) are presented. Since this anion-receptor was previously used as an additive to solid polymer electrolytes, the correlation of the data presented here and the role of anion-receptors in this type of electrolytes is discussed. The formation constants of salt-receptor complexes and receptor self-complexation (dimer formation) are estimated in the solution in the non-interacting solvent using ¹H and ¹⁹F NMR titration. Independently, the affinity of the Cx2 to low molecular weight analogs of PEO and some other organic solvents in this system was tested using the same technique. The estimated values of the formation constants are used in the discussion the role of the anion-receptor in the changes of concentration of ions, ionic agglomerates and complexes of Cx2 in the system comprising salt, solid or liquid matrix and anion-receptor.     

高效液相色谱法分析环己基苯液相氧化体系的组成

采用高效液相色谱法建立了常温下环己基苯(CHB)液相氧化体系中各组分含量的测定方法,利用间接碘量法测定环己基苯氢过氧化物(CHBHP)浓度并以此标定高效液相色谱法,绘制了CHB、CHBHP和1-苯基环己醇(PCHO)3种组分的标准曲线,并用于实际试样的测定。实验结果表明,CHB,PCHO,CHBHP的线性相关系数分别为0.995 5,0.998 2,0.990 7;CHB和PCHO的加标回收率均大于99%,CHBHP的加标回收率接近100%;对实际试样进行了5次平行实验,3种组分的相对标准偏差均不超过0.35%,精密度和准确度高,重复性良好,解决了难以获得CHBHP标准物质的问题。     

Controlled band dispersion for quantitative binding determination and analysis with electrospray ionization‐mass spectrometry

This review discusses recent emerging techniques that have been used to couple flow‐injection analysis (FIA) and electrospray ionization‐mass spectrometry (ESI‐MS) for the quantitation of noncovalent binding interactions. Focus is placed predominantly on two such methods. Diffusion‐based measurements, developed by Konermann and co‐workers, uses controlled‐band dispersion prior to ESI‐MS to determine diffusion constants and binding constants based on the temporal variation of ligand signal measured in the mass spectrum (an indirect technique). Dynamic titration, developed by Schug and co‐workers, is a direct method, where a temporal compositional gradient of a guest molecule is induced in the presence of host in solution to monitor the concentration dependence of complex formation as a function of observed complex ion abundance after ESI‐MS. Further discussion places these techniques in the context of a variety of other direct and indirect ESI‐MS‐based binding determination methods, and highlights advantages, disadvantages, and practical considerations for their proper use to investigate a broad range of macromolecular and small‐molecule interaction systems. © 2009 Wiley Periodicals, Inc., Mass Spec Rev 29:806–829, 2010     

水中碱度组成的分析

本文从理论和实践的结合上概述了工农业生产和科学研究中,水中常见的几种碱度的组成、分类和分析方法,并对水中几种碱度的组成与测定结果的关系进行了综合分析.     

一种自带修正因子的酸碱度复合控制系统

由于酸碱度调配过程的非线性和大滞后性以及系统的实时和精度要求,传统的控制方法无法得到高质量的控制效果。而模糊控制不依赖对象的数学模型,但对稳态误差却很难从根本上加以消除,考虑到PI控制对稳态误差有很好的清除作用,故系统采用了一种自带修正因子的Fuzzy-PI复合控制策略。     

硝酸羟胺HAN基液体发射药主要组份分析研究

硝酸羟胺基液体发射药是我国80年代末才开始研究的火炮“新能源”分析方法尚未确定.本文采用丙酮为“转换剂”成功地用酸碱滴定法测定了原料和成品中的硝酸羟胺HAN;采用“非水滴定法”测定了原料硝酸三乙醇胺TEAK的含量;并对液体药中TEAR之含量进行“电位滴定”方法的尝试,初步建立了“液体药组份分析方法”,保证了科研任务顺利完成.     

电位溶出滴定法研究水中痕量金属有机络合参数的计算机模拟分析

利用微机在电位溶出理论滴定曲线上叠加偶然误差模拟实际滴定曲线，比较了从滴定曲线求水中痕量金属有机络合参数的两种数学处理方法；并对滴定程序进行了优化。     

用氟硼酸根离子选择性电极电位滴定法测定复合推进剂中的高氯酸铵

本法用BF7电极作指示电极，双液接饱和甘汞电极作参比电极，用十六烷基三甲基氯化铵（CETAC）或氯代十六烷在吡啶（CPC）电位滴定用水提取的复合推进剂中的高氯酸铵。共平均回收率达99．75％，准确度和精密度中和法（甲醛法）。     

滴定法测定铁矿中氧化亚铁的不确定度评定

讨论和比较重铬酸钾滴定法测定铁矿（烧结矿）中氧化亚铁的各种不确定度因素，并评定氧化亚铁的测量不确定度。     

自动电位滴定法精密测定小量铀

针对反应堆乏燃料溶解液和铀产品溶液的高放射性水平，在钼催化硫酸亚铁还原/重铬酸钾氧化电位滴定法精密测定铀的基础上，从取样量和自动化两方面入手，以降低用自动电位滴定法精密测定小量铀对分析人员的放射性危害。研究结果表明，采用自动电位滴定仪，在取铀量为10mg时，测定精密度优于0.06%，通过校正，可使结果更加准确可靠。该方法可有效降低放射性对分析人员的危害，同时又满足了反应堆乏燃料溶解液和铀产品溶液精密测定铀的准确度要求。