高压消解-氢化物发生-原子荧光光谱法测定植物样品中的砷、锑

采用断续流动进样氢化物发生-原子荧光光谱法测定植物样品中砷、锑的含量,分析测定准确性的影响因素,选择合适的仪器工作条件、还原剂浓度、介质和载流酸度等;在选定的测定条件下,砷、锑的检出限分别为0．05ug／L和0．06ug／L,精密度为0．4％和0．5％,砷、锑的回收率分别在98％～102％和96％～104％之间。     

9原子荧光法同时测定土壤中的砷、锑

研究了以王水分解样品,硫脲-抗坏血酸作为还原剂,用双道原子荧光光度计断续流动进样方式同时测定土壤中的砷、锑。实验结果表明,砷、锑的检出限分别达到0．8μg/g、0．42μg／g,相对标准偏差分别为2．94％、3．17％;经标准物质验证,测定结果与标准值相符。     

微波消解-氢化物发生-原子荧光光谱法测定二氧化钛中痕量砷和锑

采用HNO3+HCl+HF作为消解试剂,样品经微波消解后,用L-半胱氨酸预还原,以氢化物发生-原子荧光光谱法对二氧化钛中砷和锑进行了分析。探讨了盐酸、硼氢化钾溶液浓度以及样品还原处理对测定结果的影响,确定了实验的最佳测定条件。结果表明,砷、锑在0~25μg/L范围内线性关系良好,线性相关系数均为0.9999,砷和锑的检出限分别为0.058μg/L和0.075μg/L。对5μg/L的砷、锑连续11次进样,测得结果的相对标准偏差分别为0.71%和0.78%。方法用于二氧化钛样品的测定,测定结果与ICP-AES测定结果相符,回收率为96%-108%。     

原子荧光光谱法同时测定湿法炼锌净化后液中的砷锑含量

建立了原子荧光光谱法同时测定湿法炼锌净化后液中的砷锑含量,通过试验该法测定净化后液样品的检出限砷为0.089μg/L,锑为0.075μg/L,回收率砷为92.19～101.69%,锑为91.76～106.15%,砷锑重复测定11次相对标准偏差都小于5%,锌基体含量在120～140g/L之间不影响砷锑含量的检测。测量结果的准确度和精密度良好,能够满足生产分析要求。     

氢化物发生原子吸收光谱法测定金属锌中的痕量汞

采用氢化物发生原子吸收光谱法测定金属锌中的痕量汞，研究了金属锌消解的最佳条件，本法简便、快速、重现性好，准确度高，灵敏度为0．73μg/L，检测限为0．22μg/L，相对标准偏差为3．1％，回收率为96％-102％。     

氢化物发生-电热原子吸收法测定铅锭中锑

试样用硝酸分解,分析了酸度、栽气流量、共存离子以及还原剂对铅锭中锑测定结果的影响,锑的回收率在91．8％～103．4％,检出限为0．14μg／mL,测定锑的线性范围是0～20μg／mL,本方法的测定结果同国家标准的方法一致。     

原子荧光法联合测定砷、锑、铋、汞的研究

砷、锑、铋、汞的测定,近年来在原子吸收光谱分析和原子荧光光谱分析中得到发展,本文研究了用原子荧光法联合测定土壤、矿物中痕量砷、锑、铋、汞的最佳分析和测定条件,并提出了尽可能低的能量测量原则,使方法具有较高灵敏度和选择性,砷、锑、铋检出限≤0.0010μg/g,汞为0.0002μg/g,相对标准偏差<5％,回收率96％～105％。 一、主要试剂和仪器 　 砷标准溶液(0.10mg/ml):用15％盐酸稀释成10.0μg/g工作液;锑标准溶液(0.10mg/ml):用15％盐酸稀释成1.0μg/g     

氢化物发生—原子吸收光谱分析钢中砷锑铋

用自制的氢化物循环发生式装置,测定铋的下限可达0．000002％,本文研究了砷,锑的预还原法及砷,锑的不预还原法;使氢化物发生原子吸收测砷,锑的方法在不同含量时具有互补性,既考虑到不同含量时有足够灵敏度,精确度,;又考虑到操作上的更简便易行,砷、锑方法可测下限达0．00003％。     

氢化物发生——原子荧光光谱法测定土壤中砷和锑

采用王水消解土壤样品,用氢化物发生原子荧光光谱法测定土壤中砷和锑的含量。研究并优化了载气及屏蔽气的流量,硼氢化钾的浓度,灯电流等试验条件。荧光强度与砷及锑的质量浓度在0～500μg.L-1范围内呈线性关系。在已知砷、锑量土壤试样的基础上,加入3个浓度水平的砷和锑的标准溶液后,按本试验方法作回收试验,根据结果算得砷及锑的回收率依次在99.8%～102.5%及99.3%～101.3%之间。     

氢化物发生-原子荧光光谱法同时测定锡矿石中砷和锑

通常锡矿石中砷、锑含量的检测方法都是以分光光度法为主,实验以盐酸-硝酸混合酸微波消解样品,建立了氢化物发生-原子荧光光谱法测定锡矿石中砷和锑的新方法。实验表明:以8 mL盐酸-硝酸(5+3)混酸为溶剂,采用微波消解样品,在盐酸浓度约为0.96 mol/L,硫脲和抗坏血酸的质量浓度均为10 g/L时,以HCl(1+9)作为载流液,20 g/L硼氢化钾溶液为上机还原剂进行测定,以砷和锑的荧光强度与其对应的质量浓度绘制校准曲线,线性相关系数均不小于0.999 8。砷和锑的方法检出限分别为0.044 2 μg/L和0.020 4 μg/L。干扰试验表明,锡矿石样品中的共存元素不干扰测定。采用实验方法对锡矿石实际样品中砷和锑进行测定,测得结果的相对标准偏差(RSD,n=6)分别为1.1%～1.3%和0.99%～1.4%,加标回收率分别为99%～104%和98%～104%。将实验方法应用于锡矿石标准物质的测定,测定值与认定值基本一致。     

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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