邻氯苯基荧光酮胶束增敏光度法测定微量锡

近年来光度法测定微量锡的显色反应发展迅速,其中尤以三羟基荧光酮类光度法最为显著。我们在研究邻氯苯基荧光酮(o-Cl-PF)和四价金属离子的显色反应性能后发现,该试剂在阳离子表面活性剂存在下和锡的显色反应具有反应酸度高、灵敏度好的特点,有可能应用于微量锡的测定。 本文在详细地研究各种条件的基础上提出不经分离直接测定铜合金、精铜等试样中微量锡的方法。可应用于铁合金和铝合金。表观摩尔吸光系数达1.92×1.0~5。     

苯基荧光酮分光光度法测定微量锡

微量锡测定常用的苯基荧光酮〔１、２〕、茜素紫〔３〕分光光度法等大都需经萃取、反萃取进行分离富集,方法繁琐。本文研究了在过量氨水介质中以铁（Ⅲ）为捕集剂对微量锡进行分离富集,在抗坏血酸存在下,用苯基荧光酮为显色剂测定微量锡的方法。在实验条件下显色络合物...     

铜及铜合金中微量锡的测定

本文对锡—p-NPF—CTMAB体系在0.3～1.1N硫酸介质中和酒石酸—柠檬酸、抗坏血酸、草酸存在下,进行了系统的实验研究,拟定了测定锡的方法。此方法显色快、稳定,选择性高,重现性好,操作简便。可直接测定铜及铜合金中微量锡,结果令人满意。     

磷钼杂多酸-孔雀绿-PVA分光光度法测定锡铅焊料中微量磷

试验探索了磷钼杂多酸-孔雀绿-PVA分光光度法测定锡铅焊料中微量磷的条件。方法选择用硝酸分解试样,硫酸介质中用盐酸-氢溴酸挥发除去锡、砷、锑,铅、银呈硫酸盐沉淀分离,本方法酸度条件下硅不干扰测定。高酸度显色,显色体系的干扰少,选择性好。本法空白值低,精密度高,灵敏度高,显色酸度范围宽,易操作。磷的测定范围0.000 5%～0.05%。     

高工钢中微量钛的测定

在三乙醇胺溶液中，以稀土镧为共沉淀剂，用氢氧化钠沉淀富集钛，在０．５克高工钢基本中分离富集２．５－４０微克钛，可以达到定量回收，方法吸要用氢溴酸驱锡，共沉淀的铁，钒以抗坏血清掩蔽，钨，钼以柠檬酸络合，用邻硝基苯基萤光酮－ＴｒｉｔｏｎＸ－１００显色，氧化铵退色为参比，测定其钛量。试验经合成回收，结果令人满意，对样品多次测试重复性良好，可以满足高工钢中微量钛（下限达０．０００５％）的测定。     

2-羟基-3-甲氧基苯基荧光酮与锡显色反应的研究及应用

研究了新试剂 2 羟基 3 甲氧基苯基荧光酮与锡的显色反应 ,建立了测定铜合金中微量锡的光度分析方法。在硫酸和阳离子表面活性剂溴化十六烷基三甲基铵介质中 ,2-羟基-3-甲氧基苯基荧光酮与锡发生灵敏的显色反应。在室温下锡络合物立即形成 ,络合物的组成为锡∶试剂 =1∶3 (摩尔比 ) ,其最大吸收峰位于 5 2 3 5nm ,表观摩尔吸光系数为 1.2 5× 10 5,在2 5mL溶液中 ,锡质量在 0～ 3 0 μg之间符合比尔定律。此外 ,锡与此试剂的显色反应具有良好的选择性 ,绝大多数金属离     

5－溴水杨基荧光酮光度法测定纯银及银合金的微量锡

５－溴水杨基荧光酮光度法测定纯银及银合金的微量锡龙文清,邱澄铨,高登云（江西吉安师专化学系,吉安,３４３００９）（武汉大学化学系,武汉,４３００７２）测定银中微量锡常用苯基荧光酮法［１］,但灵敏度较低。近年来,光度法测定锡显示出了高的灵敏度［２］,然...     

三氧化钼中锡的测定

本文以碘化物萃取法使锡与主体钼分离,然后以茜素紫为显色剂,用异戊醇萃取比色测定微量的锡。其中进行了选择络合物的最大吸收峰的试验,同时对于显色酸度的影响,显色剂的用量,共存离子的影响以及络合物的稳定时间等进行了一些实验。确定了用茜素紫为显色剂测定锡的比色条件。     

用8—羟基喹淋盐络合物安培检测FIA法测定无机锡（Ⅱ）

发展了一种基于锡（Ⅱ）与８－羟基喹啉生成络合物，用流动喷射分析法测定微量锡（Ⅱ）的高度选择、快速和直接的安培法。８－羟基喹啉会加速锡（Ⅱ）电氧化作用；在０．１ｍｏｌｌ＾－１醋酸盐缓冲液中（ＰＨ６），采用玻璃电极时，在＋０．０５Ｖ出现氧化峰。在０．２５－２０μｍｏｌｌ＾－１范围内，获得了峰民极与锡（Ⅱ）浓度的线线性关系。检测限为０．１μｍｏｌｌ＾－１锡（Ⅱ）溶液计得的相对标准偏差为５％（ｎ＝２０）。     

无火焰法测定钢铁中微量锡研究

研究了钢铁中微量锡的分析，使用Ｐ－Ｅ５０００型原子吸收分光光度计，利用高温石墨炉技术，样品经酸溶解后进样２０ｕｌ，经石墨炉原子化后，将锡的吸光度计算转换成浓度值接打出印出钢铁中微量锡的分析结果，此方法简单，干扰少，分析速度快。灵敏度高，精密度能满足要求，可分析钢中０．０００２％－０．０２０％锡的含量。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.