过氧化氢氧化核固红催化荧光法测定痕量钴的研究

在硼砂 氢氧化钠缓冲溶液中 ,钴 (Ⅱ )对过氧化氢氧化核固红的反应具有强烈的催化作用 ,建立了催化荧光法测定痕量钴 (Ⅱ )的新方法。此法的线性范围为 0 .16～ 3 .2 μg·L- 1 ,检出限为 5 .0× 10 - 1 1 g·ml- 1 。用于维生素B1 2 、茶叶及人发中痕量钴的测定 ,取得了满意的结果。     

过氧化氢氧化二氯荧光素动力学荧光法测定痕量镍

在近中性介质中,痕量镍(Ⅱ)对过氧化氢氧化二氯荧光素的反应具有很强的催化作用,当加入痕量镍(Ⅱ)时,可使反应体系的荧光强度减小,据此建立了催化动力学荧光法测定痕量镍(Ⅱ)的新方法。反应体系的激发波长和发射波长分别为491 nm和517 nm,测定镍(Ⅱ)的线性范围为4.0~80.0μg/L,检出限为2.4μg/L。该法用于废水中痕量镍(Ⅱ)的测定,加标回收率为103.6%。     

动力学褪色光度法测定痕量钛(Ⅳ)

在硫酸介质中 ,痕量钛 (Ⅳ )能催化过氧化氢氧化甲基红褪色 ,用分光光度法测定了催化反应与非催化反应速度的变化 ,从而对该反应进行研究。优化了反应条件 ,建立了褪色反应动力学光度法测定痕量钛 (Ⅳ )的新方法。该方法测定钛浓度的线性范围为 8～ 64 μg·L- 1 ,检出限为 0 .97μg·L- 1 。该方法操作简便 ,反应灵敏 ,可用于发样的测定     

阻抑动力学光度法测定痕量铈

基于痕量铈 (Ⅳ )在中性介质中阻抑过氧化氢氧化甲基紫的褪色反应 ,建立了阻抑动力学光度法测定痕量铈的新方法。研究了该方法的适宜条件 ,在波长 64 0nm处 ,铈 (Ⅳ )的质量浓度在 8× 10 - 4～ 4.4× 10 - 3μg·ml- 1 范围内与阻抑反应速率呈良好的线性关系 ,方法检出限达到0 .0 5 μg·L- 1 。该法用于人发和食品中铈含量的测定 ,效果满意。     

溴酸钾氧化溴甲酚紫褪色光度法测定痕量铜

基于pH 9.2的氨水 氯化铵缓冲溶液中 ,痕量铜对KBrO3氧化溴甲酚紫 (BCP)褪色的指示反应有明显的催化作用 ,建立了测定痕量铜的动力学光度法 ,方法检出限为 0 .0 2 3 μg·L- 1 ,线性范围为 0～ 1.0 μg·L- 1 。用于地质、人发、植物样品中痕量铜的测定     

催化还原褪色光度法测定煤矸石中痕量钴

在pH=4.5的HAc-NaAc缓冲溶液中, 痕量钴(Ⅱ)对次磷酸钠还原孔雀绿褪色反应具有显著的催化作用, 研究了反应的最佳条件, 并测定了一些动力学参数, 据此建立了一种测定痕量钴(Ⅱ)的新方法. 方法的检出限为7.5×10-8 g*L-1, 钴含量在0.0～50.0 μg*L-1内符合比尔定律, 表观活化能为44.28 kJ*mol-1. 本法结合N530萃取剂萃取分离, 用于测定煤矸石中痕量钴时, 结果满意.     

固相分光光度法测定煤矸石中微量锗

在 0 .2 5mol·L- 1 HCl介质中 ,锗吸附于树脂上 ,再与二溴邻硝基苯基荧光酮 (DBON PFO)反应生成红色络合物 ,在最大吸收波长 5 65nm处 ,对树脂相直接进行光度测定 ,建立了固相分光光度法测定微量锗 (Ⅳ )的的新方法。锗的质量浓度在 0～ 2 40 μg·L- 1 范围内符合比尔定律 ,其表观摩尔吸光系数为 2 .62× 10 6 L·mol- 1 ·cm- 1 。该法已应用于煤矸石中微量锗的测定 ,结果与苯芴酮法相符。     

茜素红-高碘酸钾-苄基三乙基氯化铵-三乙醇胺体系催化光度法测定痕量钴(Ⅱ)

在苄基三乙基氯化铵增敏剂和三乙醇胺活化剂存在下,钴对高碘酸钾氧化茜素红的反应具有催化作用,据此建立一种测定痕量钴(Ⅱ)的新方法。考察反应的最佳条件,测定了反应动力学参数。本法在表面活性剂和活化剂存在下,其灵敏度提高9倍。线性范围为0-200μg.L-1,检出限为1.55μg.L-1。此法用于茶叶、人发等样品中钴的测定。     

流动注射离子交换分离-分光光度法测定煤矸石中痕量钪

采用流动注射技术进行痕量钪的离子交换分离富集,在0.40 mol·L-1HBr介质中,Sc3+与Br-形成络阴离子,被离子交换树脂交换富集,用0.25mol·L-1HNO3-1.5%硫脲溶液洗脱,用对氯偶氮氯膦(CPA-pCl)分光光度法测定.有色络合物的最大吸收波长为615 nm,钪的质量浓度在0～1000μg·L-1范围内符合比耳定律,方法的检出限为1.2μg·L-1.经分离后,钪的测定灵敏度可提高数倍,大量共存离子不干扰钪的测定.该法已应用于煤矸石痕量钪的测定.     

用对羧基苯偶氮硫代若丹宁柱前衍生高效液相色谱法测定氰化尾渣中的金、铂、钯、铑的研究

研究了用对羧基苯偶氮硫代若丹宁 (CPATR)为柱前衍生试剂 ,以安捷伦ZORBAXStableBound (4 .6mm× 5 0mm ,1.8μm)快速分离柱为固定相 ,42 %的甲醇 (内含 2 %的醋酸 )为流动相 ,高效液相色谱分离 ,二极管矩阵检测器检测测定金、铂、钯、铑的的方法 ,4种贵金属元素的络合物在 2 .0min内可达到基线分离。根据信噪比 (S/N =3 )得各金属离子的检测限分别为 :金 1.5 μg·L- 1 ,铂 1.0 μg·L- 1 ,钯 0 .6μg·L- 1 ,铑 0 .8μg·L- 1 ,方法用于氰化渣样品中痕量金、铂、钯、铑的测定 ,相对标准偏差平均值在 2 .2 %～ 2 .7%之间 ,标准回收率平均在96%～ 10.2 %之间 ,结果令人满意     

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.