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。     

氢化物发生-原子荧光光谱法测定金属锌中微量砷锑

应用氢化物发生-原子荧光光谱法连续测定金属锌中的砷和锑，在优化的试验条件下，砷和锑的检出限分别为0．25μL和0．10μL，得到两种元素的回收率在95％～108％之间，相对标准偏差分别为1．3％和1.0％。本法快速简便，可测定金属锌中0．0000x％～0．0x％范围内的砷和锑，结果良好。     

原子荧光光谱法测定精锑中的砷

建立了氢化物发生-原子荧光光谱法测定精锑中砷的方法。试料用王水溶解，通过加入酒石酸抑制基体锑的水解，用硫脲-抗坏血酸将As（V）还原成As（Ⅲ），从而不需通过化学分离，直接测定精锑中的砷。方法的检出限为0．210ng／mL，相对标准偏差（n=11）为2．58％。     

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。     

原子荧光光谱法测定钨精矿中砷含量

钨精矿中的砷含量会影响其下游产品质量,且国家对污染元素砷的下限指标要求变得更严格,有必要延伸钨精矿中砷含量的检测下限。本实验采用了氢化物发生-原子荧光光谱法测定钨精矿中砷的含量,研究了砷含量测定过程中的最佳分析步骤和条件,以及考察了共存元素的干扰情况。通过条件实验、准确度实验、精密度实验,确定了该方法测试下限为0.001 0%。该方法的加标回收率为97.2%～105.0%,该方法具有操作简便快捷、准确度和精确度高的优点,适用于钨精矿中砷量的测定。     

氢化物ICP光谱法测定钢中锡砷锑铋

用氢化物原子吸收法分别测定钢中Sn、As、Sb、Bi是常见的分析方法。本文在0.5M酸性抗坏血酸还原介质中,用碘化物富集待测元素,选用北京有色研究总院生产的气动连续进样氢化物发生装置,将待测元素生成的氢化物气体直接送入ICP光源,以摄谱法同时测定锡砷锑铋。方法的测定范围为0.005～1.0％,若改变称样量,可降低测量下限。     

氢化物发生—原子荧光光谱法测定铜精矿中砷和锑

研究了用氢化物发生 -原子荧光光谱法测定铜精矿中的砷和锑 ,选择了氢化物发生 -原子荧光光谱法测定砷、锑的最佳条件。方法准确度高、结果稳定、操作简便,适用于铜精矿中0.001%～2.5%砷、0.001%～0.5%锑的测定     

氢化物发生-原子荧光光谱法测定金锭中的砷

建立了采用氢化物发生-原子荧光光谱测定金锭中砷的方法,并对样品的前处理和氢化物发生条件进行了选择和优化。该方法对砷的检出限为0．00001％,精密度RSD（n＝7）为0．2％～1．8％,加入标;住样品回收率为92％～103％。     

氢化物发生—原子荧光光谱法测定金属锰中的砷和锑

应用氢化物发生—原子荧光光谱法测定金属锰中的砷、锑含量。采用(5+1)的盐酸+硝酸混酸溶解金属锰样品,以硫脲和抗环血酸混合液作为预还原剂,以硼氢化钾作为还原剂,以氩气作载气将砷化氢、锑化氢导入石英炉原子化器中进行原子化,在特征光源激发下,产生原子荧光。在一定条件下,荧光强度与被测元素的浓度成正比,由此测定砷、锑的含量。砷、锑的线性范围为0.0~20.0μg/L,相关系数r=0.999,加标回收率为104.0%~108.5%,相对标准偏差为0.44%~2.12%。     

氢化物发生-原子荧光光谱法测定铜精矿中砷和锑

研究了用氢化物发生-原子荧光光谱法测定铜精矿中的砷和锑, 选择了氢化物发生-原子荧光光谱法测定砷、锑的最佳条件。方法准确度高、结果稳定、操作简便, 适用于铜精矿中0.001%~2.5%砷、0.001%~0.5%锑的测定。      

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.