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。     

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。     

二溴对甲基偶氮甲磺与铅显色反应的研究及其应用

研究了新试剂二溴对甲基偶氮甲磺对铅的高灵敏度、高选择性的光度测定方法。在酸性介质中,铅与二溴对甲基偶氮甲磺形成络合比为１：２的蓝色络合物,最大吸收波长为６４２ｎｍ,摩尔吸光系数为８．２８×１０￣４Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。已应用于铜合金中微量铅的光度测定,不需分离,方法简便,快速、准确。     

二溴对甲基偶氮磺分光光度法测定硅铝钡合金中钡

研究了二溴对甲基偶氮磺与钡的显色反应,建立了直接测定硅铝钡合金中钡含量的分光光度分析方法。在0.36 mol/L磷酸介质中,钡与二溴对甲基偶氮磺形成1∶5蓝色络合物,最大吸收波长为624 nm,表观摩尔吸光系数为4.38×104L.mol-1.cm-1。25 mL显色液中,钡质量在0~20μg内符合比尔定律,显色反应具有很好的选择性,主要共存离子均有较大允许量,可用于硅铝钡合金中钡含量的直接测定。     

二溴对甲基偶氮磺光度法测定锶的研究与应用

研究了新显色剂二溴对甲基偶氮磺与锶的反应,建立了直接测定硅锶铁合金中锶含量的光度分析方法。在0.72 mol/L硫酸介质中,锶(与二溴对甲基偶氮磺形成蓝色络合物,最大吸收波长为626 nm,表观摩尔吸光系数为6.22×104;在25 mL溶液中,锶量在0~12μg范围内符合比尔定律,显色反应具有很好的选择性,主要共存离子均有较大允许量,可用于硅锶铁合金中锶的直接测定。     

新显色剂二溴对甲基偶氮磺的合成及光度法测定铈组稀土元素

合成了新显色剂二溴对甲基偶氮磺并用于铈组稀土元素的光度测定。在酸性介质中，试剂与铈等稀土元素形成蓝色络合物，在６３３ｎｍ处具有最大吸收。铈含量在０～２０μｇ／２５ｍｌ范围内符合比尔定律，方法应用于钢铁中铈组稀土的直接测定，有良好的准确性和重现性。     

新显色剂二溴对甲基偶氮甲磺与铋显色反应的研究及应用

研究了铋(Ⅲ)与二溴对甲基偶氮甲磺的显色反应及其应用.结果表明在酸性介质中,该试剂与铋(Ⅲ)形成稳定的蓝色络合物,配合比为12,其最大吸收波长为645nm,表面摩尔吸光系数为1.0×105,铋(Ⅲ)在0～25μg/25mL范围内符合比尔定律.将该方法用于铸铁、铜合金中微量铋的测定,获得了满意的结果.     

二溴对甲基偶氮磺褪色光度法测定铬青铜中铬

基于0.6 mol/L硝酸介质中,显色剂二溴对甲基偶氮磺与铬(Ⅵ)的褪色反应,建立了测定铬青铜中铬(Ⅵ)含量的褪色光度分析方法。讨论了吸收光谱、酸度、试剂用量、时间、络合物组成、干扰离子等因素的影响,确定了反应的最佳条件。在25 mL溶液中,铬(Ⅵ)量在0.8~12μg范围内符合比尔定律,表观摩尔吸光系数为4.34×104L.mol-1.cm-1。方法可用于直接测定铬青铜中铬(Ⅵ)的含量,结果与二苯基碳酰二肼光度法(DPC)相符,其相对标准偏差(RSD)在0.97%~1.02%之间。     

新显色剂二溴对甲偶氮磺光度法测定氧化镁中钙

介绍了用二溴对甲偶氮磺光度法测定氧化镁中少量钙的方法.在0.4mol/L 硝酸介质中,钙与试剂形成蓝色的络合物,在波长620nm 处具有最大吸收,摩尔吸光系数ε=4.7×10~4;钙量在2～10βg/25ml 范围内符合比尔定律,反应有很好的选择性。可不经分离直接测定氧化镁中少量钙,准确度和精密度都很好。     

二溴对氯偶氮羧胂分光光度法测定微量铅

研究了显色剂二溴对氯偶氮羧胂与微量铅的显色反应条件。在0.04~0.24mol/L硫酸介质中,铅(Ⅱ)与显色剂形成蓝紫色络合物,最大吸收波长为620nm,表观摩尔吸光系数ε=4.51×104L.mol-1.cm-1,在25mL溶液中,铅的质量在0~25μg范围内符合比尔定律。方法具有较高的选择性,与其它已报道方法相比共存离子铜、锌、铝有更大的允许量。用于铜合金和铝黄铜标准样品中微量铅的测定,结果与认定值相吻合,相对标准偏差分别为1.4%和2.0%。     

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。     

Shijiazhuang will Build the World's Biggest Replacingcopper-with-aluminum Cable Production Base

正Shijiazhuang City will build the world’s biggest replacing-copper-with-aluminum cable production base,the annual output value can reach 100 billion yuan,in the future it will develop replacing-copper-with-aluminum highend industry cluster.This piece of news was learned by the reporter at the Rare Earth highiron Aluminum Alloy[Nonferrous Business Opportunity:Aluminum alloy door]Cable Conductor New Technology Application Seminar held at the provincial capital.     

Chongqing is Preparing to Set Up Nonferrous Metal Exchange,in a Bid to Become the Transit Place of Kazakhstan Copper

正Since the beginning of Chongqing’s upgrading to a municipality directly under the Central Government,Chongqing City has established direct friendly relationship with Almaty,Kazakhstan,and carried out a series of cooperation in commerce and trade,and culture     

Guangxi Baise Extends Industrial Chain to Combat Loss in Aluminum Business

正"For each tonne of aluminum being produced,the upstream enterprise on the aluminum industrial chain will suffer loss about 2000yuan."Said Liang Xiao,Deputy Director of Pingguo Industrial Park Management Committee under the Guangxi Baise City,one of the four major aluminum industry bases in China,on August 11.Extending aluminum     

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL ANNUAL CONTENTS Volume 21(2014)

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Chinalco Straightened Out Copper Assets,and Delegated Stock Equity of Yunnan Copper

正Immediately after the news that Chinalco transferred 58%stock equity of Yunnan Copper Group to its wholly-owned subsidiary China Copper Corporation Limited free of charge was disclosed on July 9,many individual investors couldn’t help but to think:Does it mean China Copper Corporation Limited will assemble assets for overall listing?At present,among main copper business companies under China Copper Corporation     

The Development and Reform Commission Encourages Private Capital to Enter Geological Prospecting Field

正At the press conference recently held by the National Development and Reform Commission under the theme"Deepen Reform in Investment AuditApproval System",when answering questions from reporters,Huang Min,Director of the Department of Fixed Assets Investment of the National Development and Reform Commission,said that in the future it would continue to intensify efforts in geological prospecting,and actively guide social capital to enter this field.     

Guangxi's first Nickel Industry Development Research Report Was Released

正Recently,Guangxi Metallurgical Research Institute,a subsidiary of Guangxi Nonferrous Metals Group,completed survey on laterite and related manufacturers in the region,by combining the current development status of laterite both at home and abroad,it compiled Guangxi’s first"Research Report on the Development of Guangxi Nickel Industrial Chain"which adopted laterite as the study subject.This report expounded on the current     

China’s Major Non-ferrous Metals Imports & Exports(End of September. 2014)

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China's Major Non-ferrous Metals Imports & Exports

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