铌-溴酸钾-偶氮氯膦Ⅲ催化光度法测定痕量铌

在稀硫酸介质中,铌灵敏催化溴酸钾氧化偶氮氯膦Ⅲ(CPAⅢ)的褪色反应,据此建立了催化动力学光度法测定铌的新方法。线性范围为0.004～0.2μg/mL,检出限2.6μg/L。本法准确、灵敏、简便,且体系稳定,用于煤渣试样中微量铌的测定,结果满意。     

反相流动注射催化动力学光度法测定微量锑(Ⅲ)

在磷酸介质中,Sb(Ⅲ)对溴酸钾氧化2-[2′-(5-硝基吡啶)偶氮]-1,8-二羟基萘-3,6二磺酸(5-NO2-PACA)褪色反应具有强烈的抑制作用。利用流动注射停留技术,建立了催化动力学光度法测定痕量锑(Ⅲ)的新方法。该方法的线性范围为0~0.36μg/mL,检出限为9.6×10-6g/L。应用于天然水样(山泉水和雨水)中微量锑(Ⅲ)的测定,结果同原子吸收光谱法的测定结果相一致,相对标准偏差分别为0.75%,1.0%,回收率分别为92.5%和107%。     

阻抑动力学光度法测定痕量碘的研究

研究了在稀磷酸介质中,痕量碘离子对亚硝酸根催化溴酸钾氧化亚甲蓝的阻抑作用,建立了测定痕量碘离子的阻抑动力学光度分析新方法。测定碘离子的线性范围为0.040～0.48μg/mL,检出限为1.7×10-8g/mL。用于测定盐中的微量碘,结果满意。     

铌—溴酸钾—偶氨氯膦Ⅲ催化光度法测定痕量铌

在稀硫酸介质中，铌灵敏催化溴酸钾氧化偶氮氯膦Ⅲ(CPAⅢ)的褪色反应，据此建立了催化动力学光度法测定铌的新方法。线性范围为0．004—0．2μg/mL，检出限2．6μg/L。本法准确、灵敏、简便，且体系稳定，用于煤渣试样中微量铌的测定，结果满意。     

溴酸钾氧化偶氮胂M褪色动力学光度法测定痕量铊(Ⅲ)

基于0.08mol/LH2SO4介质中,痕量铊(Ⅲ)催化溴酸钾氧化偶氮胂M(AsAM)的褪色反应,建立了测定痕量铊(Ⅲ)的催化光度法。讨论了酸度、反应物浓度、反应温度、时间、干扰离子等因素的影响。研究了反应的最佳条件,并测定了一些动力学参数,催化反应的表观活化能为70.12kJ/mol。方法检出限为0.17μg/L,线性范围为0～20μg/L。在25mL溶液中,测定0.5μg铊(Ⅲ)的相对标准偏差为3.4%(n=11)。结合溶剂萃取分离技术,用于测定废水及土壤样品中痕量铊(Ⅲ),回收率为97.0%～103     

鲁米诺-过氧化氢-Fe(Ⅲ)-8-羟基喹啉化学发光体系的研究及其应用

基于Fe(Ⅲ)和8-羟基喹啉对鲁米诺-H2O2化学发光体系的催化作用,结合流动注射技术,建立了测定痕量Fe(Ⅲ)的流动注射化学发光分析法。Fe(Ⅲ)质量浓度在1.0×10-4~0.2μg/mL范围内与发光强度呈线性响应,回归方程为ICL=1.96×105ρ(μg/mL)-2.54,相关系数0.999,检出限为4.0×10-5μg/mL。测定2.0×10-3μg/mL的Fe(Ⅲ),100倍的K ,Na ,NH 4,Ca2 ,Mg2 ,Zn2 ,Al3 ,Ba2 ,NO-3,SO24 ,F-,Cl-和10倍的Co2 ,Mn2 ,Cu2 不干扰;等量的Cr(Ⅵ)有干扰,可用D311A阴离子交换树指消除。该法用于井水中痕量Fe(Ⅲ)的测定,加标回收率98%~104%。测定结果与邻二氮菲光度法吻合,相对偏差<±6%。     

溴酸钾氧化考马斯亮蓝G250反应的催化动力学光度法测定痕量钒和亚硝酸根

建立了溴酸钾氧化考马斯亮蓝G250反应的催化动力学分光光度测定痕量钒和亚硝酸根的新方法。研究了在磷酸介质及抗坏血酸活化条件下,钒(Ⅴ)强烈的催化溴酸钾氧化考马斯亮蓝G250的褪色反应,该催化反应可用于钒的测定,线性范围是0~0.4 ng/mL,检出限是5.2×10-11g/mL,催化反应的表观活化能为192.2 kJ/mol,表观速率常数为3.02×10-3s-1,用于水样中痕量钒的测定;同一指示反应在不同的温度下,亚硝酸根也具有很高的催化活性,据此可用于亚硝酸根的测定,线性范围是0~0.4μg/mL,检出限是9.4×10-8g/mL,催化反应的表观活化能为26.7 kJ/mol,表观速率常数为1.17×10-3s-1,用于硝酸盐试剂中痕量亚硝酸根的测定。     

利用协同催化作用动力学光度法测定痕量锰

研究了在pH 4.5的HAc-NaAc缓冲溶液中,利用锰(和钒(对溴酸钾氧化还原型罗丹明B显色反应的协同催化作用,建立了催化动力学光度法测定痕量锰的新方法。方法测定锰的线性范围为0~0.32μg/mL,检出限为6.1×10-10g/mL。用于铝合金和茶叶中痕量和微量锰的测定,结果满意。     

铬(Ⅵ)-溴酸钾-乙基紫体系催化光度法测定水中痕量铬(Ⅵ)

在磷酸介质中,利用铬(Ⅵ)催化溴酸钾氧化乙基紫褪色的指示反应,建立了催化光度法测定痕量铬的新方法。对测定条件和共存元素干扰进行了研究。方法的线性范围为0.004～0.094μg/mL铬(Ⅵ),检出限为1×10-9g/mL,用于管网水、溪水和电镀废水中痕量铬(Ⅵ)的测定,相对标准偏差小于2.5%,试样加标回收率为97%～102%。     

氢化物发生-原子荧光光谱法测定精碲中微量砷

提出了一种氢化物发生-原子荧光光谱法测定精碲中微量砷的方法。用硝酸溶解样品,氢氧化钾和盐酸调节溶液酸度至pH 5.5~6.5,碲水解沉淀析出。除去了大量基体后,溶液中碲量少于50μg/mL。在盐酸介质中用硫脲-抗坏血酸将砷(预还原为砷(Ⅲ),以标准加入法绘制校准曲线,氢化物发生-原子荧光光谱法测定砷量。方法的检出限为0.02μg/L,砷量在0.02~40μg/L范围内有良好的线性关系。方法操作简便、快速,应用于精碲中痕量砷的测定,测定结果与正戊醇萃取砷钼蓝分光光度法的结果相符,相对标准偏差为4.2%~8.5%,样品的加标回收率在93%~104%之间。     

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.