非离子型微乳液介质结晶紫-硅钼杂多酸分光光度法测定钢样中硅

在光度分析中 ,以合适的微乳液为介质与相同含量的胶束体系比较具有很好的增溶、增敏作用。本文首次以OP/n C5H1 1 OH/n C7H1 6 /H2 O水包油 (O/W )型非离子微乳液为介质 ,对结晶紫 -硅钼杂多酸分光光度法进行了研究。其实验最佳条件为 3 .0mL 2 .5× 10 - 2 mol/L钼酸铵溶液 ,13 .0mL 2 .0mol/L硫酸溶液 ,3 .0mL微乳液 ,6.0mL 1.0× 10 - 3mol/L结晶紫溶液。最大吸收波长为 5 60nm ,表观摩尔吸光系数为 1.85×     

锰对溴酸钾氧化罗丹明B的荧光猝灭效应研究及其应用

在酸性条件下,溴酸钾氧化罗丹明B发生荧光反应,锰能催化该荧光猝灭反应。实验研究了锰对溴酸钾氧化罗丹明B的荧光猝灭效应并讨论了将其应用于锰分析的最佳条件。试验表明,在50 mL比色管中,分别依次加入3.5 mL 1.0×10^-6 mol/L罗丹明B溶液、1.5 mL 1.0×10^-4 mol/L溴酸钾溶液、1.2 mL 0.1 mol/L盐酸及不同量的锰溶液,于60 ℃加热8 min,锰质量浓度在1.0×10^-8~2.0×10^-7 mol/L范围内与荧光猝灭程度呈线性响应,方法的检出限为2.0×10^-9 mol/L。体系应用于水样中锰的分析,测得结果与原子吸收光谱法基本一致,相对标准偏差(RSD,n=11)为3.9%～4.2%。     

示波催化极谱法测定高纯铅中痕量镍

在 8.6× 1 0 -5 mol/L丁二酮肟— 0.4mol/L氯化铵— 3mol/L亚硝酸钠底液介质中 ,溶液的 pH 8.2左右 ,镍具有极灵敏的催化波 ,波形良好稳定。本法采用硫酸使铅生成硫酸铅沉淀分离主体铅 ,用示波极谱法测定。镍浓度在 1× 1 0 -2 ～ 1.2× 1 0 -1μg/mL范围内与峰电流呈线性关系。镍的加标回收率在 90.5%～ 1 1 4%。测定含量为 0.0 0 0 2 1 %的试样 ,相对标准偏差为 6 9%。本法具备选择性好、灵敏度高、准确度好的特点 ,适用于高纯铅中     

浓度对罗丹明B水溶液荧光强度影响研究

配制了较宽浓度范围(10~(-1)~10~(-5)g/L)的罗丹明B水溶液,测量其发射光谱。结果表明:荧光强度随溶液浓度的升高先增大,后降低。在低浓度范围内(10~(-3)~10~(-5_)g/L),荧光强度与罗丹明B溶液浓度有很好的线性关系,并且拟合出经验公式;当浓度大于5×10~(-3)g/L时,荧光强度与罗丹明B溶液浓度近似成e指数关系,并且随着溶液浓度的增大,荧光强度减小,最大荧光强度的发射波长λem红移(即向波长增大的方向移动)。更重要的是,利用拟合的公式,通过荧光强度的测量推算出的溶液浓度与配制的浓度值符合很好,说明反测量溶液浓度方法的可行性与准确性,本工作对于实现罗丹明B溶液溶度快速、准确测量有重要意义。     

罗丹明B 正丙醇 氯化钠体系析相萃取分离和富集镓

研究了罗丹明B 正丙醇 氯化钠析相萃取镓的行为及与一些金属离子分离的条件。结果表明, 氯化钠能使正丙醇的水溶液分成两相,在分相过程中,GaCl4 与罗丹明B(RhB)生成的缔合物［GaCl4-］［RhB+］能被正丙醇相完全萃取。当溶液中罗丹明B、氯化钠和正丙醇的浓度分别为04 g/L、02 g/ mL和30 %（V/V）,且盐酸浓度为００５~1 mol/L时,GaCl4-的萃取率达到977%以上,而Fe2+、Co2+、Mg2+、Ag+、Cu2+、Ru3+、Ni2+和Cr3+基本不被萃取,实现了Ga3+与上述金属离子的分离。     

硝酸钠-碘化钾-罗丹明B体系浮选分离汞Ⅱ的研究

研究了硝酸钠 -碘化钾 -罗丹明B体系浮选分离汞 的行为和汞 与常见离子分离的条件。结果表明 ,控制溶液pH 5.0 ,当固体NaNO3用量为 1.0g ,0.1mol/L碘化钾和 0.0 0 1mol/L罗丹明B溶液的用量均为 0.5mL时 ,Hg2 + 可被定量浮选 ,而Cu2 + ,Zn2 + ,Mn2 + ,Co2 + ,Ni2 + ,Fe2 + ,Al3+ 等离子在此条件下不被浮选 ,实现了Hg2 + 与这些离子的定量分离。方法用于合成水样中微量汞 的定量浮选分离测定 ,结果满意     

Na2WO4溶液中阴离子的存在对钨交换容量的影响

研究了用Na2 WO4 溶液进行钨的离子交换时 ,溶液中SO2 - 4、Cl- 、OH- 的存在对钨交换容量的影响 ,试验表明 ,随着上述三种阴离子浓度的增加 ,钨的交换容量明显降低。同时 ,三种阴离子存在时的正交试验表明 ,其对钨的交换容量影响程度的顺序为 :Cl- >SO2 - 4>OH- ,交前液中 [WO3]=2 0g/L ,[SO2 - 4]<0 0 312 5mol/L ,[Cl- ]<0 0 0 84 6mol/L ,[OH- ]<0 4 70 6mol/L是可行的。在上述阴离子存在下 ,通过串柱离子交换可提高钨的交换容量。     

磷钼蓝分光光度法测定环境水样中无机磷

一种新的硫酸亚铁铵-果糖混合还原剂用于钼蓝光度法测定磷。在0.6 mol/LH2SO4介质中,硫酸亚铁铵-果糖将磷钼杂多酸还原成杂多蓝,其最大吸收波长为824 nm,表观摩尔吸光系数为2.56×104L.mol-1.cm-1,PO34-质量浓度在0~2.4 mg/L范围内符合比尔定律。除砷和硅外,水样中共存元素对测定没有干扰;加入1 mL 50 g/L酒石酸钾钠溶液可分别消除0.01 mg As(,Si(干扰。方法用于环境水样中无机磷的测定,结果满意。     

负载罗丹明B的微晶萘固相萃取分离铊(Ⅲ)

研究了利用微晶萘萃取分离痕量Tl(Ⅲ)的新方法。结果表明,在磷酸介质中,3.0g柠檬酸三钠存在下,当50μg/mL KBr溶液用量为1.0mL,1.0×10-3 mol/L罗丹明B溶液用量为1.4mL,1.0×10-2 mol/L萘丙酮溶液用量为3.0mL时,Tl(Ⅲ)与Br-形成的TlBr-4可与罗丹明B发生反应,从而被微晶萘定量吸附。在此条件下Al(Ⅲ)、Cu(Ⅱ)、Zn(Ⅱ)、Ni(Ⅱ)、Mn(Ⅱ)、Mg(Ⅱ)、Hg(Ⅱ)、Cr(Ⅲ)、Bi(Ⅲ)等不被吸附,据此建立了分离富集Tl(Ⅲ)的新方法。对合成水样中铊进行分离和测定,效果良好。     

离子交换分离富集极谱法连续测定金、铂、铱、铑、钌

研究了在同一份试液中极谱法连续测定Au、Pt、Ir、Rh、Ru的体系。首先在1mol/L的氢氧化钠溶液中,于原点电位-0.20V处扫描作Au的峰电流-质量浓度曲线;然后,改变溶液pH值,在0.75mol/L硫酸-1.5%氯化铵-1.5×10-3mol/L六次甲基四胺-0.003%硫酸肼体系中,于原点电位-0.78V处扫描作Pt、Ir、Rh的峰电流-质量浓度曲线;最后,加入2.25mol/L硫酸-4%氯化铵-2.5×10-4mol/L硫脲测定Ru。在选定的实验条件下得到令人满意的分析结果,线性范围分别为:0.1～1000μg/mL(Au);8×10-5～6.4×10-3μg/mL(Pt、Ir);1.6×10-5～1.28×10-3μg/mL(Rh);1.14×10-4～3.42×10-3μg/mL(Ru)。实际样品通过阴离子交换树脂分离富集后进行分析,回收率在93%～106%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.