铬天青S分光光度法测定聚乙烯树脂中铝

以络天青S为显色剂和CyDTA-Mn溶液为掩蔽剂掩蔽铁离子,分光光度法测定聚乙烯树脂中微量铝。详细考察了测定条件。铝与铬天青S生成的络合物吸收的最大值位于660nm,络合反应瞬间完成,且有色溶液的吸光度至少可稳定8 h。Al3+的浓度在0~0.32 mg/L范围服从比尔定律,表观摩尔吸光系数ε=7.93×104L.mol-1.cm-1。本方法已用于测定聚乙烯树脂中微量铝,回收率和相对标准偏分别为95.2%~100%和3.1%。     

用二溴对甲基偶氮溴磺新显色剂光度法测定铝合金中微量铅

研究了在酸性介质中,新显色剂二溴对甲基偶氮溴磺与铅的显色反应。在3mol/L的磷酸介质中,显色剂与铅 形成2∶1的稳定的蓝色络合物。其最大吸收波长为640nm,表观摩尔吸光系数ε=1.06×105,铅含量在0～25μg/25mL范围内符合比尔定律。大多数金属离子的允许量在毫克量级。拟定的方法用于铝合金中微量铅的测定,结果令人满意。     

二溴对甲基偶氮磺光度法测定铝合金中微量铅

研究了新显色剂二溴对甲基偶氮磺与铅的反应,建立了直接测定铝合金中微量铅的光度分析方法。在0.6mol/L硝酸介质中,铅与二溴对甲基偶氮磺形成1∶2蓝色络合物,最大吸收波长630nm,表观摩尔吸光系数为9.05×104。在25mL溶液中,铅含量在0～50μg符合比尔定律。用于铝合金标样中铅的测定,相对标准偏差RSD为1.85%～4.02%,结果与标准值吻合。本法可用于铝合金中微量铅的直接测定。     

锡精矿中氧化镁的测定—二甲苯胺蓝-Ⅱ分光光度法

二甲苯胺蓝-Ⅱ作为微量镁的显色剂在国内外曾发表过一些研究报告.我们在前人工作的基础上,应用此试剂来测定锡精矿中低量镁.试验表明,在pH10,30%乙醇介质中,试剂与镁定量反应生成酒红色可溶性络合物,最大吸收峰在520纳米处,摩尔吸光系数ε_(510)=2.4×10~(4)升·摩尔~(-1)·厘米~(-1),氧化镁含量在0～12微克/25毫升内符合比尔定律.为消除锡精矿中大量锡及伴生元素的影响,本实验应用碘化铵挥发锡,铜试剂沉淀铁、铅、铜、铋、锰等元素,然后以酒石酸钾钠掩蔽铝,锶—EGTA掩蔽钙.本法适用于     

2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯胺分光光度法测定钯(Ⅱ)

研究了显色剂2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯胺与Pd(的显色反应的条件。结果表明:试剂与钯在pH 5.5的HAc-NaAc缓冲介质中形成稳定的紫红色络合物,其组成比为2∶1,λmax=585 nm,络合物表观摩尔吸光系数为1.2×104L.mol-1.cm-1,Pd(在0~1.6 mg/L范围内符合比尔定律。方法可以不经分离直接测定钯碳催化剂和合成工业废水中微量钯,加标回收率分别为100.8%和101.0%,RSD(n=6)分别为0.6%和0.7%。     

依来铬氰蓝R光度法测定铝

依来铬氰蓝R(Solochrome CyanineR),作为铝的显色剂,在选择性和稳定性方面,都优于铬天青R和铬天青S,是光度法测定多种试样中铝的理想显色剂.无阳离子表面活性剂(CTMAB)时,配合物在535nm处有最大吸收,摩尔吸光系数为6.5×10~4,铝量在1～8μg/25ml范围内遵从比尔定律,配合物在24h内无变化;有CTMAB时,最大吸收移至590nm处,ε_(500)=1.2×10~5,0～2μgAl/25ml符合比尔定律,配合物至少稳定2h.     

二溴羟基苯基荧光酮吸光光度法测定铜合金中微量锡

在0.10～0.30 mol·L~(-1)盐酸介质中,锡与DBH-PF、乳化剂OP形成三元络合物。其最大吸收位于520nm处,表观摩尔吸光系数为1.3×10~5,锡含量在0～11μg/25ml范围内符合比耳定律。应用于铝青铜、铅黄铜中微量锡的测定。     

1-偶氮苯-3-(5-溴-2-吡啶)-三氮烯的合成及其与镍的显色反应

合成了新试剂1-偶氮苯-3-(5-溴-2-吡啶)-三氮烯(ABBPTA),并研究了它与镍的显色反应。在pH 10.5的Na2B4O7-NaOH缓冲溶液中,Triton X-100表面活性剂存在下,该显色剂与镍生成摩尔比为4∶1的红色络合物,络合物的最大吸收峰位于540 nm,表观摩尔吸光系数为2.11×105L.mol-1.cm-1。在25 mL溶液中,镍量在0~12μg范围内符合比尔定律,相关系数r=0.999 7。该体系有良好的选择性,大多数常见离子有较高的允许量,用拟定方法测定铝合金中微量镍,回收率为98.2%~102.8%,相对标准偏差为2.1%~2.4%。     

萘相分光光度法测定原油中微量铜

以铬天青S为显色剂,采用萘相分光光度法测定原油中微量铜,并考察了样品灰化和测定条件。在650℃将样品灰化4.5 h以上,用HNO3溶解灰分中的铜,使干扰离子与铜分离。在650 nm波长处的表观摩尔吸光系数ε=7.93×104L.moL-1.cm-1,25 mL溶液中其线性范围为0~8μg。原油测定结果的相对标准偏差为1.90%,回收率为99.83%。     

导数分光光度法测定铝及铝合金中微量锰的研究

研究了利用 5 Br PADAP作显色剂 ,乳化剂OP作增溶增敏剂 ,导数分光光度法测定铝及铝合金中微量锰的适宜条件。经对纯铝及铝合金国家标准样品进行分析 ,相对标准偏差RSD≤ 1 2 % (0.0 0 0 4 %Mn) ,标准加入回收率在 97%～ 1 0 3%之间。     

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.