2-(四氮唑偶氮)-5-二乙氨基苯甲酸光度法测定铜

研究了新显色剂2 (四氮唑偶氮) 5 二乙氨基苯甲酸(TTZDBA)与铜显色反应的条件。结果表明,在pH4 0的HAc NaAc缓冲溶液中,TTZDBA与Cu2+形成稳定的紫红色络合物,其最大吸收波长在570nm处,表观摩尔吸光系数为4 08×104,Cu2+质量浓度在0～0 4mg/L范围内符合比尔定律。所拟方法可不经分离直接测定镁合金和铝合金标样中的微量铜,加标回收率100 8%～102 1%,RSD(n=6)在1 8%～4 2%,结果令人满意。     

2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯胺光度法测定铜Ⅱ

研究了新显色剂 2 - (5-羧基 - 1 ,3,4-三氮唑偶氮 ) - 5-二乙氨基苯胺 (CTZAN)与Cu 的显色反应条件。结果表明 ,Cu 在 pH3 0的HAc -NaAc缓冲溶液中与CTZAN形成稳定的组成比为 1∶2的紫色络合物 ,λmax=565nm ,试剂的λmax=435nm ,对比度Δλ =1 30nm ,表观摩尔吸光系数ε =3 0 3× 1 0 4 ,Cu(Ⅱ )浓度在 0～ 0 8mg/L范围内服从比尔定律 ,所拟方法用于测定镁合金和铝合金标样中微量铜 ,加标回收率为 1 0 1 4%～ 1 0 4 0 % ,RSD(n =6) =1 4%～ 3 9% ,结果满意。     

铜(Ⅱ)与Br-BTAQ显色反应的分光光度法研究

本文研究了在溴化十六烷基三甲基铵存在下,铜(Ⅱ)与Br-BTAQ的配合物显色反应,及用消色法测定微量铜的可能性.结果表明,在pH4.2～5.6的KHC_8H_4O_4—NaOH缓冲介质中,铜(Ⅱ)与Br-BTAQ形成一种黄色配合物,其λ_(max)=425nm,表观摩尔吸光系数s_(425)=3.92×10~4,配合比为Cu:Br-BTAQ=1:3,铜含量在0～20μg/25ml时,符合比尔定律.采用消色法,使测定灵敏度提高2倍,可不经分离,直接用于铝合金中微量铜的测定.     

5′-硝基水杨基荧光酮分光光度法测定油样中铜Ⅱ

研究了以微乳液(CTMAB+正丁醇+正庚烷+水)为介质,5′-硝基水杨基荧光酮为显色剂,在KH2PO4-Na2HPO4缓冲体系中,采用分光光度法直接测定油样中微量铜(的方法。试剂与铜形成的络合物最大吸收波长位于570 nm处。25 mL溶液中,铜(含量在0~9μg范围内服从比尔定律,其摩尔吸光系数ε570=1.4×105L.mol-1.cm-1。采用抗坏血酸作为掩蔽剂,消除了油样中存在的Ni2+,Fe3+,Al3+等干扰离子对测定所产生的影响。该方法应用于大庆原油和砂油中铜(的测定,加标平均回收率分别为9     

N-己基-N''''-(对氨基苯磺酸钠)硫脲光度法测定微量铜的研究

研究了显色剂饱和脂肪烃取代基化合物N-己基-N＇-（对氨基苯磺酸钠）硫脲（HXPT）和微量Cu（Ⅱ）的显色反应。结果表明：在pH4．8～5．4的HAc—NaAc介质中，Cu（Ⅱ）与HXPT形成摩尔比为1：3的蓝色水溶性稳定络合物，其最大吸收波长在343．6nm，表观摩尔吸光系数为ε343．6nm=3．26×10^5L·mol^-1·cm^-1。25mL显色液中铜在0～12μg范围内符合比尔定律，相关系数r=0．9990。方法已成功应用于铝矿样和生物样品中微量铜的测定，结果满意。     

2-羟基-5-硝基苯基重氮氨基偶氮苯光度法测定铜

在TritonX 100存在下,研究了新试剂2 羟基 5 硝基苯基重氮氨基偶氮苯(HNPDAAB)与铜的显色反应。在pH9.5～11.0的Na2B4O7 NaOH缓冲溶液中,试剂与铜生成1∶1深红色络合物,其表观摩尔吸光系数达1.21×105。于25mL溶液中,Cu2+浓度在0～10μg范围内符合比尔定律。方法用于铜矿和铝合金中铜的测定,结果与原子吸收法吻合。     

铜（Ⅱ）—苯基荧光酮—溴化十六烷基三甲铵体系的研究

本文研究了在pH5.30—5.60六次甲基四胺—盐酸缓冲介质中,在溴化+六三基烷甲铵(CTMAB)存在下,铜(Ⅱ)与苯基荧光酮(PFO)形成稳定的黄橙色配合物,在560nm处有最大吸收,对比度为66nm,配合物组成比为Cu:PFO:CTMAB=1:1::2,摩尔吸光系数为1.10×10~5,铜量在0～3μg/25ml符合比尔定律,应用于铝合金中微量铜(Ⅱ)的测定,得到良好效果。     

离子液体双水相萃取分光光度法测定铜

建立了由亲水性离子液体四氟硼酸1-丁基-3-甲基咪唑([Bmim]BF4)和NaH2PO4形成的双水相体系萃取光度法测定铜的新方法。研究了离子液体用量、溶液酸度、铬天青S、盐的加入量对测定的影响及共存物质对Cu2+萃取测定的影响及消除。在pH 5.0~8.0范围内,离子液体双水相中铬天青S及Cu2+形成的络合物有较高的吸光度,络合比为3∶1,络合物最大吸收波长位于590 nm,表观摩尔吸光系数ε=5.16×104L.mol-1.cm-1,Cu2+量的线性范围为0~4.0μg/mL。方法用于铝合金标准样品中     

N-己基-N′-(对氨基苯磺酸钠)硫脲光度法测定微量铜的研究

研究了显色剂饱和脂肪烃取代基化合物N-己基-N′-(对氨基苯磺酸钠)硫脲(HXPT)和微量Cu(Ⅱ)的显色反应。结果表明:在pH4.8～5.4的HAc-NaAc介质中,Cu(Ⅱ)与HXPT形成摩尔比为1∶3的蓝色水溶性稳定络合物,其最大吸收波长在343.6nm,表观摩尔吸光系数为ε343.6nm=3.26×105L.mol-1.cm-1。25mL显色液中铜在0～12μg范围内符合比尔定律,相关系数r=0.9990。方法已成功应用于铝矿样和生物样品中微量铜的测定,结果满意。     

3,4-亚甲二氧基苯甲醛缩氨基硫脲分光光度法测定矿样中铜

研究了显色剂3,4-亚甲二氧基苯甲醛缩氨基硫脲(PTSC)与Cu(显色反应条件。结果表明,在pH 7~8的KH2PO4缓冲溶液中,PTSC与Cu(形成组成比为1∶1的稳定黄色络合物,最大吸收波长λmax=380 nm,络合物的表观摩尔吸光系数ε=7.2×104L.mol-1.cm-1,铜量在0~0.8μg/mL范围内符合比尔定律,大量的其他金属离子共存时,不需预分离和加掩蔽剂,可直接测定矿样中微量铜。     

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.