吸附伏安法测定铝合金中的痕量镓

本文报导了在0.3mol/L的HAc—NaAc(pH4.3),苯邻三酚红(PR)4.0×10~(-6)mol/L及十二烷基磺酸钠(SDS)1.0×10~(-6)mol/L的底液中,镓—PR形成—稳定的配合物,还原峰电位-0.89V(对SCE)。预富集60秒镓浓度在1.0×10~(-9)～4.0×10~(-7)mol/L范围内与配合物导数峰高成良好的线性关系。富集90秒检测下限为8.0×10~(-10)mol/L。讨论了其他痕量金属和表面活性剂的干扰,并确定镓与邻苯三酚红络合比为1∶1,可用于铝合金中镓的测     

铋—檞皮素极谱络合吸附波测定锰盐中的痕量铋

在0.015至0.02mol/L H_2SO_4底液中,可获得灵敏的铋(Ⅲ)—檞皮素的络合吸附波.铋浓度由1.0×10~(-8)至6.0×10~(-6)mol/L与其二阶导数波有正比关系,检出限为5.0×10~(-9)mol/L.用其测定了试剂锰盐中10~(-4)的铋.测得电活性络合物组成为铋(Ⅲ):檞皮素=1:2,条件形成常数β=5.5×10~(-9).     

单扫描示波极谱法测定金

河南师大周漱萍教授等提出:在pH3的KCl-甲酸-甲酸钠溶液中金和茜素紫在-0.79伏有还原峰。峰高与金浓度有线性关系。用0.1mol/L KCl-0.04 mol/l甲酸-甲酸钠,茜素紫为5.0×10~(-6)mol/l的底液时、测定金的范围为1.0×10~(-7)—5×10~(-6)mol/l;茜素紫为2.5×10~(-5)mol/l时、测金范围为2.5×10~(-6)—1.0×10~(-5)mol/l。大量Zn、Mg、Mn~(2+)、Co、Cu、Ni、Al、Ag、Cd不干扰。40倍Te~(4+)、Ge~(4+),20倍In,8倍Pb等也不干扰。大量碱、碱土金属、常见阴离子不干扰。氧化性阴离子NO_2~(-1)、BrO_3~(-1),     

微量铅镉锌的极谱催化波连续测定

铅镉锌在醋酸钠——碘化铵体系中铅镉产生一个对称性好,波峰尖锐的吸附催化波。锌在此体系中也产生一个高灵敏度的阳极导数波,比阴极导数灵敏度提高约14倍。铅浓度9.6×10~(-7)～5.8×10~(-5)摩尔,镉浓度1.8×10~(-6)～1.1×10~(-4)摩尔,锌浓度3.1×10~(-6)～1.8×10~(-4)摩尔波高与浓度呈直线关系。用于环保、食品、土壤及矿物微量铅镉锌的检测。     

铜(Ⅱ)—铜铁试剂络合吸附波的研究

铜(Ⅱ)在0.1mol/LHAc—NaAc、2.0×10~(-4)mol/L铜铁试剂溶液(pH5.0)中,出现一良好的示波极谱导数图,Ep=-0.25V(vs.SCE),ip’与Ccu在5.0×10~(-8)～5.0×10~(-6)mol/L范围内成线性关系.用直线法测得.络合物的络合比为Cu(Ⅱ):Cup=1:1,表观稳定常数β=2.8×10~5.用线性扫描和循环伏安法等研究该波的性质及反应机理.实验表明该波为络合吸附波.     

纯铝和纯锡中痕量铜的示波极谱测定

纯金属中痕量元素的分析是当前分析化学研究的一个重要课题,要求分析方法具有较高的灵敏度和良好的选择性。极谱法测定铜的方法已有报导,但铜—2-巯基苯并噻唑体系尚未见报导。我们在实验中发现,在氨性底液中,铜—2-巯基苯并噻唑配合物在单扫极谱上有—灵敏的还原波。实验确定底液的适宜组成为:8×10~(-5)mol/L2-巯基苯并噻唑,0.80mol/I NH_3·H_2O,0.040mol/L NH_4Cl。在此条件下,该配合物波高与铜浓度在1×10~(-9)～2×10~(-7)g/ml范围内呈良好的线性关系。对3     

微量铜的示波极谱测定

1 引言用极谱催化波方法测定铜的工作已有报道。本文研究了铜—乙二胺—十二烷基苯磺酸钠体系,在单扫描示波极谱仪上于-0.68V(vs.SCE)处产生一个灵敏的二次导数示波极谱电流峰。检测限为2.5×10~(-8)mol/L,线性范围为3.7×10~(-8)～2.5×10~(-6)mol/L。用本法测定纯铝、水样及人     

铋—7-碘-8-羟基喹啉-5-磺酸配合物吸附波的研究

本文提出了测定微量铋的铋—7-碘—8-羟基喹啉-5-磺酸新体系。在0.2mol/L NaOH,4×10~(-5)mol/L7-碘-8-羟基喹啉-5-磺酸溶液中,铋(Ⅲ)—7-碘-8-羟基喹啉-5-磺酸配合物在单扫示波极谱上有一灵敏的配合物吸附波。波的峰电位为-0.67V(vs.SCE),波高与铋浓度在8×10~(-10)～2×10~(-6)g/ml范围内呈良好的线性关系。对极谱波性质进行了初步探讨,将该体系应用于纯锡中痕量铋的测定,结果令人满意。     

锌(Ⅱ)—组氨酸络合吸附波的研究及应用

本文提出和研究了锌(Ⅱ)—组氨酸体系的络合吸附波。在0.05mol/L NH_3—0.05mol/L NH_4Cl底液中,加入组氨酸后,使锌(Ⅱ)的单扫示波极谱导数峰电流增大,峰电位从-1.24V(vs.SCE)负移至-1.36V。该导数峰电流与锌(Ⅱ)的浓度在1.0×10~(-7)-7.0×10~(-6)mol/L范围内成正比,检测限达5.0×10~(-8)mol/L,用于镀锌车间排放废水中锌的测定,得到满意的结果。研究了该极谱波的性质及反应机理,证明为反应物弱吸附的络合吸附波,吸附反应物为锌(Ⅱ)与组     

锇(Ⅷ)-N-(8-喹啉基)-N’-苯甲酰基硫脲(QBTU)络合物吸附波的1.5次微分极谱研究

于0.025mol/LNaOH溶液中,Os(Ⅷ)-QBTU体系产生—明晰的极谱波,其1.5次微分峰电流与浓度在1.0×10~(-7)～4.0×10~(-5)mol/L范围内呈线性关系。研究了极谱电流的性质、反应机理及电极过程等后确认:络合物的组成为[OsO_4(OH)_2·QBTU]·Na_2并吸附于滴汞电极表面,配体QBTU在不离解出的情况下发生电还原,获得络合物吸附波,电极过程不可逆,[OsO_4(OH)_2·QBTU]~(2-)离子的条件稳定常数8.5×10~5。     

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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