酸性镀铜液中硫酸铜的自动电位滴定

研究了用自动电位滴定法测定酸性镀铜液中硫酸铜的条件和方法。实验结果表明,在pH=10的氨-铵缓冲介质中,在Ca-EDTA共存下,以EDTA作滴定剂,用钙离子选择性电极作指示电极,以饱和甘汞电极作参比电极,滴定Cu2+,具有明显的电位突跃和清晰的滴定终点,该方法具有较高的准确度和精密度。应用于酸性镀铜液中硫酸铜的分析,方法简便快捷,能在4min内打印出结果。     

自动电位滴定法测绒面镍镀液中氯化镍

采用自动电位滴定法测定绒面镍镀液中的氯化镍含量.分析了酸度和介质、镀液添加剂、主盐、共存离子和实验用水等对分析结果的影响,同时选择合适的电极、适宜的滴定剂浓度、滴定搅拌速率和滴定体积.实验结果表明,与常规的以铬酸钾为指示剂的硝酸银滴定法相比,提高了分析的准确度和精密度,而且方法简便快捷.     

碱性铜锡合金镀液中游离氢氧化钾含量的自动电位滴定

研究了碱性铜锡合金镀液中用自动电位滴定法测定游离氢氧化钾的条件和方法。实验结果表明,以pH复合电极为指示电极,设定滴定终点为pH=11.52时,共存的氰化钾和酒石酸钾不干扰测定。方法具有较高的准确度和精密度,而且操作简便快捷,7 m in内能打印出分析结果。     

光亮镍镀液中硼酸含量的自动电位滴定

研究了光亮镍镀液中硼酸含量自动电位滴定的条件和方法。实验结果表明,用柠檬酸钾作掩蔽剂,防止Ni~(2+)的沉淀和其它重金属离子的干扰;加入丙三醇溶液,以pH复合电极为指示电极,进行自动电位滴定来测定硼酸,方法简便快捷,分析结果准确可靠。     

国内文摘(220—231)

<正> 摘220 TQ114.105.4 铅电极电位滴定联碱母液中的硫酸根——陈永德;《大化科技》1987,N3,18～22页以铅离子选择电极作指示电极,以饱和KCl—40%异丙醇、6%KNO_3双接界甘汞电极为参比电极,采用硝酸铅标准液作为滴定液,电位滴定联碱母液中SO_4~(2-)的方法。分     

电位滴定法测定电泳漆槽液中锌离子含量

取一定量的电泳漆槽液，用蒸馏水稀释后，加入醋酸铵缓冲溶液，使溶液ｐＨ＝６．５～６．８。以铜离子选择电极为指示电极，饱和甘汞电极为参比电极，用铜试剂标准溶液进行电位滴定。用二级微商法计算滴定终点，而间接求出电泳漆槽液中Ｚｎ＾２＋的含量。以铅离子选择电极为指示电极，用硝酸铅标准溶液进行电位滴定，用类似的方法即可测定电泳漆槽液中ＰＯ＾３－４的含量。     

渣油中碱性氮含量电位滴定测定法研究

以高氯酸-冰醋酸溶液为标准滴定液,采用玻璃复合电极进行电位滴定,用电位滴定曲线的电位突跃来判断终点,建立了渣油中碱性氮含量的测定方法.结果表明所建方法相对标准偏差小于2 %,方法重复性好,克服了因渣油颜色较深、没有合适指示剂确定滴定终点的缺点,可以用于测定渣油中碱性氮化物含量.     

自动电位滴定法测量牙齿美白产品中过氧化物含量

建立了电位滴定法自动测定牙齿美白产品中过氧化物的方法.该方法以铂金复合电极为指示电极,硫代硫酸钠为滴定剂,滴定曲线一级微商极值判定终点.该方法避免了传统手动滴定中颜色判定的人为误差,并且提高了测试结果的准确度.该方法操作简单,滴定终点清晰,准确可靠,重复性好,能满足日常检测的需求.     

钯电极在电位滴定中的应用

<正> 金属钯能吸附大量氢,并具有贵金属的特性,在电化学分析中可用作电极材料,但其应用远不如铂广泛。钯电极在电位滴定中作为指示电极目前报导不多。由于电位滴定法具有仪器简单、快速易行等优点,能弥补一些容量化学分析中的缺陷,有日益取代目视容量滴定法的趋势。因此,研究和寻找电位滴定中各种类型的指示电极和参比电极,具有重要的实际意义。在电位滴定试睑中发现,不经特殊处理的钯电极和各种类型的参比电极配合,无论是中和滴定、沉淀滴定或氧化-还原滴定等均能得到满意的结果。这种电极具有坚固耐用、稳定性好、电阻小、灵敏度高,在滴定等当点处响应锐敏、精确等特点。因而研究各种钯电极形状、极化条件和各类参比电极对扩展电位滴定在容量化学     

210~＃松香改性酚醛树脂的非水溶液电位滴定

用非水溶液电位滴定方法，通过选择电极对、被滴定液浓度等条件，得到了２１０~＃松香改性酚醛树脂在甲苯－乙醇混合溶剂中电位滴定曲线。用电位滴定曲线确定了测定２１０~＃松香改性酚醛树脂酸值的指示剂和实验方法。     

自动电位滴定法快速测定铝箔生产液中的氯离子

利用自动电位滴定仪,在体积分数为80％的丙酮介质中,以Ag电极为指示电极,双盐桥甘汞电极为参比电极,对铝箔生产液中Cl-进行非水滴定,方法的电位突跃明显,电极响应速度较快,SO42-、Cu2+、Fe3+及可能存在其他离子均对测定结果无影响,实现了自动电位滴定法快速测定铝箔生产过程液中Cl-的含量,结果表明本法是一种测定...     

Studies with chromium ferricyanide epoxy resin-based membranes

The solid membrane of chromium ferricyanide in epoxy resin has been used as a silver sensitive electrode. The electrode response to silver ions is non-Nernstian, but a linear plot has been obtained in the concentration range 10^?1-10^?3M with a slope of 46 mV per decade of activity. The response time of the electrode is a few seconds and potentials generated are reproducible. The electrode is not specific to silver ions but can nevertheless be used in presence of Hg²⁺, Zn²⁺ and Cd²⁺. Anions show no interference. Silver can be estimated even in the presence of interfering ions by potentiometric titration using the membrane as an end point indicator electrode.     

端基滴定法测定聚磷酸铵聚合度

对端基滴定法测定聚磷酸铵聚合度的影响因素进行了分析研究，发现除聚磷酸铵水解断链外，残余铵离子和聚磷酸铵中的磷酸盐杂质也是影响滴定结果的重要因素。通过控制实验条件、加入四苯硼钠除铵、测定磷酸盐杂质的量等措施，可以消除残余铵离子、磷酸盐杂质的影响，水解断链倾向也得到了一定程度的抑制。在采取上述措施后，得到了较可信的聚磷酸铵聚合度测定结果。     

Studies on an araldite-based membrane of copper hexacyanoferrate (III) as a caesium ion-sensitive electrode

Solid membranes of copper hexacyanoferrate (III) in araldite are evaluated as a caesium ion-sensitive electrode. The electrode can be used for caesium determination in the concentration range of 10⁻¹ to 10-⁴M . The potentials generated across the membrane are reproducible and steady potentials are attained in about 1 to 2min. The same electrode can be used over a period of 6 months without significant change in potential. The electrode can be used in the pH ranges 2.5–6.0 at 10⁻² M Cs⁺ and 3.0–6.0 at 10⁻³ M CS⁺, and in presence of a number of interfering ions. Potentiometric titration of caesium nitrate with 12-moIybdophosphoric acid was also carried out using the membrane as an end point indicator.     

Sorption of Metal Ions on Acrylamidezirconium (IV) Arsenate and its Synthesis of PVC based Lead (II) Selective Electrode

Abstract

The adsorption of different metal ions on acrylamidezirconium (IV) arsenate has been studied. The effect of surfactant concentration (Tween 80‐R and Tritron X‐100) on sorption of different metal ions acrylamidezirconium (IV) arsenate was explored. The effect of experimental parameters such as contact time, temperature, and pH on adsorption of Pb²⁺ions was studied. The promising feature of the material is its specificity for Pb²⁺ ions. A new PVC based Pb²⁺ ion‐selective electrode using acrylamidezirconium (IV) arsenate as electro‐active material has been fabricated. The electrode works well over a wide range of concentration 1×10^?1 M–1×10^?7 M with a Nerstian slope of 30±1 mV per decade. The sensor shows the short response time of 20 seconds and can operate in the pH range of 2–7. The sensor can be used for the period of over 4 months with out deviation in response characteristics. The electrode has been successfully used as an indicator electrode for potentiometric titration of Pb²⁺ ions in solution against EDTA solution.     

库仑滴定法测定油田水中的硫离子

采用库仑滴定法测定油田水中的硫离子含量。在pH=5.0的HAc-NaAc缓冲液中,I-在Pt工作电极上电解析出滴定剂I2,I2可定量滴定溶液中的S2-。方法适用于微量、常量分析,相对标准偏差为1.3%（n=10）,与碘量法对比,两者结果无显著性差异。该方法具有简便、快速等优点,用于油田水中硫离子的测定,结果满意。     

N-甲基对硝基苯胺水分测定方法的改进

用卡尔-费休法测定N－甲基对硝基苯胺水分，改变传统测定方法中半自动滴定为自动滴定，反应溶液由N，N－二甲基甲酰胺／无水甲醇（体积比4：3），改为三氯甲烷／无水甲醇（体积比3：2），改善了溶液对电极灵敏度的影响，缩短了预滴定时间，提高了分析的准确度。     

Synthesis of single‐walled carbon nanotubes cerium(IV) phosphate composite cation exchnager: Ion exchange studies and its application as ion‐selective membrane electrode for determination of Cd(II) ions

Single‐walled carbon nanotubes cerium(IV) phosphate composite cation exchanger was synthesized using sol−gel method. The ion‐exchange properties such as elution concentration, elution behavior and effect of temperature on ion exchange capacity were studied. The composite cation exchange material showed an ion‐exchange capacity (IEC) of 1.64 meq dry g⁻¹ of ion exchanger. The distribution studies revealed that the composite cation‐exchanger is highly selective for Cd(II) ions. The material was used as an electroactive component for the construction of a cadmium ion‐selective membrane electrode. The membrane electrode showed a Nernstian response for Cd(II) ions over a wide concentration range of 1 × 10⁻⁷−1 × 10⁻¹ M with a sub‐Nernstian slope of 27.429 mV per decade change in concentration of cadmium ions. The limit of detection was found to be 1 × 10⁻⁷ M. It possessed a fast response time 10 s and can be utilized for 130 days without any considerable divergence in response potential. The practical utility of membrane electrode was demonstrated by employing as an indicator electrode for the potentiometric titration of Cd(II) with ethylenediamine tetra acetic acid, disodium salt (EDTA). POLYM. COMPOS., 38:1005–1013, 2017. © 2015 Society of Plastics Engineers     

Potentiometric titration of cyclopropene esters

The quantitative determination of cyclopropene acids occurring as esters in seed oils can be made by a direct titration with hydrogen bromide in toluene, but the color indicator used heretofore to determine the end point presented problems. A potentiometric titration that avoids these problems was devised. A silver-silver chloride indicator electrode and a calomel reference electrode connected to the titration cell by a salt bridge were employed. The precision of the cyclopropene analysis of purified samples seems to depend primarily on the accuracy to which the amount of titrant can be determined. At the 1% level, reproductible values to about ±0.01% are obtained. One of the facilities of the Southern Region, Science and Education Administration, U.S. Department of Agriculture.