极化膜离子选择性电极的初步研究

前言经典的第二类电极作为内参比电极,电位滴定中的指示电极已有不少研究和应用。但作为离子选择电极,在直接电位法测定离子活度中应用却是聊聊无几。普遍地认为用阳极极化法制备的极化膜电极(即属于第二类电极)性能不如固态压膜电极好,因而不被人们重视。一些综合报导中,多数没有把极化膜电极归于离子选择电极之列。实际上极化膜电极有压膜电极所没有的某些优点。如固态压膜电极制作工序很烦琐,需要经过制备纯净的沉淀,而后再压片、抛光、粘合等工艺。而极化膜电极却比较简单,一般实验室都可     

通用稀土电极的研究

Takasoka·Y等在铜片上涂活性材料制成稀土离子电极。吴金兰等人在此基础上做了改进,试制成内充溶液式电极,该电极对轻稀土离子有较一致的响应。最近陈方平等以Nd(PMBP)_3络合物为活性材料研制成Nd电极,该电极受稀土离子干扰大,揭示了作为稀土通用电极的可能性。本文以Y(PMBP)_3为活性材料、DBP为增塑剂,研制成PVC膜通用稀土电极,用该电极测定了P_(507)萃淋树脂分离Tb的琳洗曲线。     

以氧传感器为基的辅助电极型冶金传感器的研究进展

金属熔体的化学组成是金属冶炼过程的重要参数,固体电解质传感器可以提供金属冶炼过程中成分变化的实时信息;这些信息可以提高生产效率,提升产品质量.由于缺乏以待测元素为导电离子的固体电解质,除氧以外的一些元素的测量多通过在电解质的表面涂覆一层含待测元素和电解质中导电离子元素复合物的方法来实现.总结了氧传感器及其他元素成分传感器的研究进展,介绍了以氧传感器为基础的辅助电极型成分传感器,并对辅助电极型传感器的应用和发展进行了展望.     

电化学方法在无机铬形态分析中的应用进展

综述了近年来电化学方法在无机铬形态分析的应用进展,主要介绍了包括库仑法、电位滴定法、极谱法、溶出伏安法及离子选择性电极电位法。重点对溶出伏安法及离子选择性电极电位法在铬形态分析中的应用进行了阐述,并对电化学方法在铬形态分析的现状及发展趋势进行了展望。未来的发展主要集中在:提高方法的选择性,尽可能减少或免去样品的预处理过程,进行直接测定;制备新型电极材料以改善测定结果的重现性;研制和发展全自动化的测试仪器;发展铬形态分析的原位、实时分析技术以及进一步研究不同形态铬在环境中迁移转化规律及铬存在形态与毒性关系。     

用氧化铈离子选择电极检测稀土

高坂和铃木研制出一种新的使用二氧化铈膜的稀土离子选择电极(参见日本化学学会公报1979,52,3455—6)。 铈在55％CeO_2-45％粘合剂内的浓度最符合能斯脱(Nersnt)理论。将该电极对溶液中的三价镧、镨、镝、镥和钇的灵敏度就活度作图获得约为58毫伏的斜率。最佳pH范围为3—5.5。钡和锆对电极没有干扰,但碱金属的干扰很明显。     

PVC涂膜Ce(Ⅳ)离子选择性电极的制备与性能

本文以二甲苯胺蓝(II)为活性剂,采用涂膜的方式,制备了PVC涂膜Ce(Ⅳ)离子选择性电极.确定了膜组分材料的添加量,以及测定了选择性电极的各项响应性能.结果表明:当选择性电极的涂膜厚度为0.43 mm,增塑剂(邻苯二甲酸二丁酯)为100 mg,离子添加剂(油酸)10 mg时电极有较好的响应效果,并且所制备的离子选择性电极对Ce(Ⅳ)有很好的响应性能,其线性范围为1.0×10-5~1.0×10-1mol/L,最佳的酸度范围为0.3~0.8 mol/L,其稳定性和重现性都较好,电极使用寿命大于180 d.     

对甲基苯磺酰化丝氨酸钕(Ⅲ)络合物修饰PVC膜钕离子选择性电极的研制

利用自制的对甲基苯磺酰化丝氨酸稀土钕(Ⅲ)络合物为电活性物质制成了一种对钕离子有响应的PVC膜离子选择性电极。对电极的性能研究表明,以KCl为电解质溶液,在pH 4.5的醋酸-醋酸钠缓冲溶液中,电极对钕离子在1.00×10-6~1.00×10-2mol/L的浓度范围呈良好能斯特响应,校准曲线斜率为19.3 mV/dec,检出限为6.31×10-7mol/L;电极对Nd(Ⅲ)离子具有良好的选择性,Cu2+、Mg2+、Co2+、Mn2+、Ni2+、Fe(Ⅲ)等离子对Nd(Ⅲ)的测定影响较小或没有干扰;电极具有较好的稳定性和较长的使用寿命。该电极应用于人工样品中钕(Ⅲ)的测定,RSD为0.10%。     

Nafion修饰电极在伏安分析中的应用

本文综述了Nafion修饰电极特性,离子在膜内化学响应机理及其在伏安分析中的应用,指出了其在分析测试中应用的广阔前景。参考文摘44篇。     

LaF_3及LaF_3(掺杂)固体电解质的特性及其应用

对LaF3及LaF3(掺杂 )作为固体电解质的导电能力和特性进行了分析。讨论了掺杂对LaF3导电性的影响。介绍了LaF3及LaF3(掺杂 )单晶固体电解质在室温水溶液中氟离子选择电极、多晶固体电解质在高温熔体中镧传感器、以及各类气体传感器中的应用     

铵离子选择性电极的研制

设计与制作了一种新型银—氯化银/氯化铵/膜选择性电极,并用不同的探针电极测量了不同阳离子膜在氯化铵溶液中的膜电位。分析了膜电位的形成原因,讨论了溶液浓度、探针电极和离子膜种类对膜电位的影响。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.