铋－邻氯苯基荧光酮－溴化十六烷基三甲铵显色反应的研究与应用

研究了在ｐＨ９．２５～１１．０的缓冲溶液中,在溴化十六烷基三甲铵（ＣＴＭＡＢ）存在下,Ｂｉ（Ⅲ）与邻氯苯基荧光酮（ｏ－ＣＰＦ）生成的紫红色络合物,其最大吸收波长为５７０ｎｍ,摩尔吸光系数为１．１２×１０￣５,Ｂｉ：ｏ－ＣＰＦ＝１：３,铋量在０～３０μｇ／２５ｍｌ范围内符合比尔定律,用于测定钨矿中的铋,结果满意。     

邻羟基萘基荧光酮光度法测定微量钼

研究了在表面活性剂溴化十二烷基二甲基苄铵（ＤＤＭＢＡ）存在下,钼与邻羟基萘基荧光酮（β－ＨＮＦ）的显色反应,Ｍｏ（Ⅵ）与β－ＨＮＦ形成１∶２红紫色配合物,配合物在波长５５０ｎｍ处的摩尔吸光系数ε为１．４７×１０￣５。钼含量在０～５μｇ／５ｍｌ范围内符合比尔定律。许多其它金属离子不干扰测定。应用于钢铁、合金及矿物中钼的测定,收到好的效果。     

催化极谱法直接快速测定钢中微量钼

对钼的极谱性能已有较多的研究,提出了好些微量钼的极谱测定体系［１～６］,但未见钼－邻苯二酚紫－溴化十六烷基三甲基铵－氯酸钾的极谱测定体系的报道;经试验,我们发现在这体系中Ｍｏ（Ⅵ）产生良好的二阶导数极谱波,其峰电位为－０．５８Ｖ（ｖｓ．ＳＣＥ）,向体系加入一定量ＥＤＴＡ后,Ｆｅ（Ⅲ）的干扰被消除,不用分离可直接用于钢中微量铝的测定,结果满意。１实验部分１．１主要仪器和试剂ＪＰ－２型示波极谱仪,三电极系统;ｐＨＳ－２型酸度计。邻苯二酚紫：０．０２％溶液;溴化十六烷基三甲基铵：０．０６％溶液;氯酸钾…     

电位滴定法连续测定钴、镍和铜的方法研究（Ⅱ）

本文以Ｐｔ电极作指示电极,Ｗ电极作参比电极,在氨性介质中,以Ｋ＿３Ｆｅ（ＣＮ）＿６滴定Ｃｏ￣（２＋）以后,继而利用Ｆｅ（ＣＮ）／Ｆｅ（ＣＮ）作指示离子,在ｐＨ５．５～６．０,用Ｚｎ￣（２＋）返滴定ＥＤＴＡ,连续测定Ｎｉ￣（２＋）或Ｎｉ￣－Ｃｕ含量,再用硫酸肼作Ｃｕｙ￣（２－）的释放剂,Ｚｎ￣（２＋）返滴定释放出的ＥＤＴＡ测定Ｃｕ￣（２＋）,实现了Ｃｏ－Ｎｉ－Ｃｕ连续测定。镍精矿样分析的相对标准偏差和试样中标准回收率分别为Ｃｏ：１．４％,９９．５±１．２％。Ｎｉ：１．１％,１００．１±０．９％。Ｃｕ：２．０     

耐尔蓝－钪钼杂多酸－聚乙烯醇体系光度法测定钪

在聚乙烯醇（ＰＶＡ）存在下,耐尔蓝（ＮＢ）与抗钼杂多酸络阴离子形成离子缔合物,其最大吸收位于５８５ｎｍ,表现摩尔吸光系数ε＝３．５９×１０５Ｌ·ｍｏｌ－１·ｃｍ－１,服从比尔定律范围０～２μｇＳｃ／２５ｍｌ,测定极限３,０ｎｇＳｃ／ｍｌ（ｎ＝７）,对于０．０４μｇＳｃ／ｍｌ测定的相对标准偏差ＲＳＤ＝２．８％（ｎ＝１０）。离子缔合物的摩尔组成为Ｓｃ：Ｍｏ：ＮＢ＝１：１２：３。本法已用于地质样品中钪的测定,结果满意。     

5—（2－噻唑）偶氮－8－氨基喹啉的合成及光度法测定微量钴

合成了新试剂５－（２－噻唑）偶氮８－氨基喹啉（ＴＡＡＱ），测定了它的酸离解常数，并用于光度法测定微量钴。在ＣＴＭＡＢ存在下，０．０４～０．０２ｍｏｌ／１ＮａＯＨ介质中，ＴＡＡＱ与Ｃｏ￣２＋形成１：３的深蓝色络合物，最大吸收峰位于６３０ｎｍ，摩尔吸光系数ε＝１．２３×１０￣５１．ｍｏｌ￣－１·ｃｍ￣－１。Ｃｏ￣２＋在０～１０μｇ／２５ｍｌ范围内符合比尔定律。方法具有较好的选择性，已用于ＶＢ＿（１２）及矿石分析，结果满意。     

回火时间对0．16C－10Ni－14Co－1Cr－1Mo钢和0．23C－12Ni－14Co－3Cr－1Mo钢组织与性能的影响

研究了０．１６Ｃ－１０Ｎｉ－１４Ｃｏ－１Ｃｒ－１Ｍｏ（１６ＮｉＣｏ）钢在５１０℃和０．２３℃－１２Ｎｉ－１４Ｃｏ－３Ｃｒ－１Ｍｏ（２３ＮｉＣｏ）钢在４８２℃回火的组织与性能。随回火时间的延长，强度、硬度的降低主要是由于Ｍ_２Ｃ的粗化及与基体共格性降低所致。Ｍ_２Ｃ的粗化速度２３ＮｉＣｏ钢要小于１６ＮｉＣｏ钢。     

铱－钼酸盐－罗丹明B缔合显色反应的研究

在聚乙烯醇（ＰＶＡＶＡ）存在下,铱与钼酸盐和罗丹明Ｂ（ＲＢ）形成离了缔合物。缔台物的最大吸收位于５７０ｎｍ摩尔吸光系数ε８．３６×１０￣５’Ｌ·ｍｏｌ￣－１·ｃｍ￣－１,服从比尔定率范围为０～２．７５μｇｌｒ／２５ｍｌ。测定２．０μｇ铱的相对标准偏差为２．５％（ｎ＝７）,检出限４３ｎ／ｍｌ（ｎ＝１２）。测定铱的适宜条件为ＣＨＣｌＯ＿４＝０．９３ｍｏｌ／Ｌ,Ｃ＿ＭｏＯ￣２－＿４９．０×１０～－４ｍｏｌ／Ｌ,Ｃ＿ＲＢ＝３．３×ｌ０￣－５ｍｏｌ／Ｌ,ＰＶＡＯ０８％。试验了３０多种共存离子的影响,除形成杂多酸元素     

5－（4－硝基苯偶氮）－8－氨基喹啉与钯的显色反应研究

在Ｔｗｅｅｎ－８０存在下,钯与５－（４－硝基苯偶氮）－８－氨基喹啉（ｐ－ＮＰＡＱ）在碱性介质中形成１：２蓝货色配合物,λ＿（ｍａｘ）在６６０ｎｍ处,摩尔吸光系数ε＝４．５×１０￣４。钯量在０～３５μｇ／２５ｍｌ范围内符合比尔定律。用于催化剂、阳极泥中微量钯的测定,结果满意。     

二溴邻硝基苯基荧光酮光度法测定钼

二溴邻硝基苯基荧光酮（ＤＢｏＮＰＦ）曾用于铌、钽和锆的测定〔１～３〕,但用于钼的测定尚未见报道〔４〕。本文研究了该试剂在磷酸介质中与钼的显色反应。利用Ｍｏ（Ⅵ）－ＤＢｏＮＰＦ－ＴｒｉｔｏｎＸ－１００三元体系,建立了测定微量钼的方法。所形成的１：２红色...     

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.