铁(Ⅲ)-硫氰酸钾-甲基紫-聚乙烯醇体系分光光度法测定痕量铁

提出了Fe(-硫氰酸钾-甲基紫三元络合物光度法测定痕量Fe(的新方法。在pH 2的硫酸介质中及聚乙烯醇存在下,Fe(与硫氰酸钾和甲基紫生成组成为1∶4∶1的三元络合物,络合物的最大吸收波长在500 nm处,表观摩尔吸光系数ε=3.65×105L.mol-1.cm-1。在50 mL溶液中,铁量在0.027~6μg范围内符合比尔定律,测定2μg Fe(6次,RSD为2.48%,方法已用于水中痕量铁的测定。     

新荧光试剂1-(4-羟基水杨醛缩氨基)-8-羟基-3,6-萘二磺酸钠荧光熄灭法测定痕量铝

采用荧光熄灭法在水相中研究了席夫碱试剂1—（4—羟基水杨醛缩氨基）—8—羟基—3,6—萘二磺酸钠（HSHND）测定痕量Al（Ⅲ）的方法和条件．在pH4．2的邻苯二甲酸氢钾缓冲体系中,试剂的激发波长λex=356nm,荧光发射波长λem＝418nm,铝（Ⅲ）浓度在0．5～3．0μg/10mL范围内呈良好的线性关系,检出限为0．5μg/10mL。本法的灵敏度及选择性好,操作简便快速．用于水样中痕量铝的测定,结果满意。     

利用协同催化作用动力学光度法测定痕量锰

研究了在pH 4.5的HAc-NaAc缓冲溶液中,利用锰(和钒(对溴酸钾氧化还原型罗丹明B显色反应的协同催化作用,建立了催化动力学光度法测定痕量锰的新方法。方法测定锰的线性范围为0~0.32μg/mL,检出限为6.1×10-10g/mL。用于铝合金和茶叶中痕量和微量锰的测定,结果满意。     

对安替比林偶氮苯甲酸固相萃取分光光度法测定钯的研究

合成了新试剂对安替比林偶氮苯甲酸(AABA),根据其与钯的显色反应及C18固相萃取小柱对显色络合物的固相萃取,建立了一种测定痕量钯的新方法。在pH3.5~5.5的乙酸-乙酸钠缓冲介质中,有乳化剂OP存在下,钯与AABA发生反应形成1∶2的稳定络合物,该络合物可用C18固相萃取小柱富集,小柱上富集的络合物用乙醇洗脱后用分光光度法测定。在富集后的测定液中,络合物最大吸收波长为452 nm,表观摩尔吸光系数ε=1.22×105L·mol-1·cm-1,Pd2+含量在0.1~1.5μg/mL内符合比尔定律,方法用     

原卟啉-吐温80-硫酸铵液固体系分离和测定铜、镍的研究

在表面活性剂吐温80存在下,pH 9.5的NH3.H2O-NH4Cl缓冲溶液中,原卟啉与Cu(形成1∶1的深红色络合物,该络合物能被吐温80-硫酸铵液固体系固相析出,从而使Cu(和Ni(分离,在569 nm处分光光度法测定Cu(,原子吸收光谱法测定Ni(。研究了原卟啉铜络合物的光谱特性、组成、稳定常数、形成和萃取分离条件,并对络合及萃取机理进行了探讨。方法对于铜的线性范围为0~15μg/mL(r=0.999 5),检出限为0.006 9μg/mL,已用于土壤样品中铜的测定。     

新荧光度剂1-(4-羟基水杨醛缩氨基)-8-羟基-3,6-萘二磺酸钠荧光熄灭法测定痕量铝

采用荧光熄灭法在水相中研究了席夫碱试剂1-(4-羟基水杨醛缩氨基)-8-羟基-3,6-萘二磺酸钠(HSHND)测定痕量Al(Ⅲ)的方法和条件q
在pH4.2的邻苯二甲酸氢钾缓冲体系中,试剂的激发波长λex=356nm,荧光发射波长λem=418nm,铝(Ⅲ)浓度在0.5～3.0μg/10mL范围内呈良好的线性关系,检出限为0.5μg/10mLq
本法的灵敏度及选择性好,操作简便快速。用于水样中痕量铝的测定,结果满意。     

表面活性剂对钇-桑色素络合物的荧光增敏及其分析应用的研究

研究了在 pH3.0的HCl-NaAc介质中 ,各种表面活性剂对稀土离子 -桑色素 (morin)络合物的荧光增敏作用 ,建立了利用钇 (Y) -桑色素 (morin) -十二烷基磺酸钠 (SLS)胶束增敏荧光反应测定痕量钇的荧光光度新方法。方法的检出限为0.0 1μg/mL ,荧光强度与钇的含量在 0～ 8μg/mL范围内呈线形关系 ,已成功地应用于混合稀土氧化物中钇含量的测定     

离子交换树脂相分光光度法测定水中痕量铁

提出了利用离子交换树脂相分光光度法测定痕量铁的方法。在中性介质中,铁离子与邻苯二酚紫形成有色络合物,将其富集在粒径为0.177~0.250 mm的201×4苯乙烯阴离子交换树脂上,制作成薄层树脂,于波长648 nm处光度法直接测定。铁含量在0.004~0.24μg/mL范围内符合比尔定律,方法检出限为4.1μg/L。加入2,3-二巯基丙醇掩蔽超过允许量的Bi3+,Sn4+等离子的干扰,其余共存离子基本无干扰。方法用于水中痕量铁的测定,相对标准偏差为2.0%~2.3%,回收率在98%~99%之间。     

苯基荧光酮分光光度法测定煤灰中微量铀

在pH10的氨性缓冲溶液中,CTMAB存在下,铀与苯基荧光酮生成稳定的有色络合物。其表观摩尔吸光系数为1.07×105,最大吸收波长为560nm,络合物组成比为铀∶苯基荧光酮=1∶3。在25mL溶液中,铀质量在0～20μg范围内遵守比尔定律。方法灵敏度高,络合物稳定时间长。煤灰经溶解处理后,采用三辛胺-二甲苯萃取分离干扰离子,本法测定其中微量铀,获得了满意结果。     

分光光度法测定多晶硅中铁和铝

将多晶硅(硅粉)用氢氟酸和硝酸二次溶解,用高氯酸的二次冒烟去除氟离子对铝的干扰,用3 cm的比色皿解决铁低灵敏度带来的误差大的问题。使用分光光度法准确测定多晶硅中铁和铝的含量。研究了显色条件对显色反应的影响,确定最佳实验条件。结果表明,在pH3~5的乙酸-乙酸钠缓冲溶液中,铁与5 mL 0.25 g/L的1,10-二氮杂菲10 min后生成稳定的红色络合物,且在2~10μg/50 mL范围内服从比尔定律;在pH 5.5~6.1的六次亚甲基四胺缓冲溶液中,铝与5 mL 0.3 g/L的铬天青-S在15 min后形成稳定的紫红色络合物,且在4~16μg/50 mL范围内服从比尔定律。用分光光度法能准确测定纯度为99.99%多晶硅(硅粉)中铁和铝含量,并与ICP-AES法测试结果对比,相对误差在5%左右。     

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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