石墨炉原子吸收光谱法测定钮扣电池中痕量金

样品经王水溶解,聚氨酯泡沫塑料分离富集后,用20 g/L硫脲溶液解析,20 g/L抗坏血酸溶液作基体改进剂,采用石墨炉原子吸收光谱测定钮扣电池中痕量金。优化了石墨炉的测定条件,采用700 ℃和1 700 ℃作为灰化和原子化温度,缩短了测定时间,延长了石墨管的使用寿命。测定结果显示钮扣电池中金含量低于10 ng/g,RSD低于10 %,回收率在88 %～112 %之间,方法检出限为0.15 ng/g,该法适合电子元器件中痕量金的测定。     

石墨炉原子吸收光谱法测定硅铁材料中痕量钴

通过对样品前处理条件及仪器分析条件的优化,建立了石墨炉原子吸收光谱法测定硅铁材料中痕量钴的方法。选择合适的灰化和原子化温度,采用平台石墨管测定,无需加基体改进剂就可以得到较好的分析结果和精密度,并简化了样品的前处理方法。使用硝酸和氢氟酸消解样品,使硅生成氟化硅蒸发掉,消除了基体的干扰,也避免了使用高氯酸作为消解试剂所引起空白值高及对石墨管寿命的影响。方法检出限为0.29ng/mL,测定钴的线性范围为0～40ng/mL。本方法在无基体改进剂的条件下采用标准加入法进行痕量钴的测定,结果与认定值相符,相对标准偏差为2.2%～6.5%。     

石墨炉原子吸收光谱法测定生铁中痕量锡

报告了采用热解涂层石墨管,塞曼扣背景的石墨炉原子吸收光谱法测定生铁中痕量锡的方法。用硝酸溶解样品,抗坏血酸作为基体改进剂,锡的灰化和原子化的温度分别为800℃和2400℃。在上述条件下测定锡的灵敏度比较高,检测信号稳定,共存元素对锡的测定影响较小。该方法测定锡的线性范围为0～160μg/L,检出限为0.014ng/mL,方法用于生铁中锡的测定,相对标准偏差为4.0%～4.7%,平均加标回收率为96%～106%。     

石墨炉原子吸收光谱法测定高纯阴极铜中痕量硅的研究

研究了用石墨炉原子吸收光谱法测定高纯阴极铜中痕量硅的方法。采用钨涂层石墨管和氟化钾作基体改进剂双重手段阻止了碳化硅的生成 ,解决了石墨炉测硅时生成的碳化硅干扰准确测定的难题。方法灵敏度为 5.8× 10 - 1 1 g/1%吸收 ,硅测定范围为 0～ 15.0 μg/L ,对 10 0 μg/L硅标准溶液重复测定 10次 ,其相对标准偏差为 4.41%。对含 2 g/L铜的高纯铜溶液测得硅回收率为 98%。     

石墨炉原子吸收光谱法测定滑石中酸溶痕量铅镉

研究了石墨炉原子吸收光谱法测定滑石中酸溶痕量铅镉的方法。采用硝酸(φ=5%)加热溶解滑石,既表征自然环境中滑石所能溶出的全部铅、镉,又避免了对石墨管的腐蚀,得到平稳且较高的吸光度。利用试样中溶出基体镁与硝酸形成的硝酸镁作为基体改进剂,使铅、镉的灰化温度分别提高到900℃和500℃,消除了基体干扰,溶出滑石中的其他元素均不影响铅、镉的测定。该方法测定铅、镉量的线性范围分别为0~100μg/mL,0~10μg/mL;检出限分别为1.95μg/L,0.54μg/L。用于滑石中酸溶铅、镉的测定,相对标准偏差分别为     

石墨炉原子吸收光谱法测定锌锭中的砷

以硝酸处理试样 ,利用锌基体对石墨炉原子吸收法测定砷的改进作用 ,无须加入其它改进剂 ,标准加入法直接测定锌锭中的砷 ,该法检出限为 0.3 6μg/L ,回收率为 93 %～ 10 5 %。     

铁基体改进效应在石墨炉原子吸收法测定痕量镉中的应用

用石墨炉原子吸收分光光度法测定环境废水中的痕量Cd时,Mn、Cr、Ni、Cu、Co、Zn等共存元素干扰严重.用100mg/L的Fe作为基体改进剂可消除上述共存元素的干扰,测定结果令人满意.     

石墨炉原子吸收光谱法测定锡锭中痕量铝

建立了石墨炉原子吸收光谱法测定锡锭中痕量铝的方法,确定了样品分解方式和石墨炉原子吸收光谱测定铝的最佳条件。以盐酸-过氧化氢（V（盐酸）∶V（过氧化氢）= 2.5∶1.5）分解样品,在16 g/L柠檬酸、0.12 mol/L盐酸介质中,以4 g/L硝酸钙为基体改进剂进行铝的测定。结果表明：在选定的酸度介质中,不需要挥锡,锡不会水解,样品溶液保持清亮时间长;硝酸钙提高了测铝的灵敏度,并增强了抗氯化物干扰的能力;样品中锡及共存元素不干扰测定。该方法的检出限为2.96 μg/L,线性范围为0～100 μg／L,相关系数r≥0.998 0。方法用于锡锭中铝的测定,相对标准偏差为6.6%,回收率在100%～119%之间,样品测定值与标准加入法及ICP-AES法测定值相符。     

石墨炉原子吸收法测定饮用水样中铅和铬

拟定了用HNO3-H2 O2 消化样品 ,以钯盐作基体改进剂 ,用石墨炉原子吸收测定饮用水中Pb和Cr的分析方法。Pb ,Cr的检出限分别为 0.0 0 8,0.0 3μg/L ,对含 1 0 μg/L的Pb ,2 0 μg/L的Cr的合成水样的相对标准偏差分别为 1.9%与1.6%。     

高纯氧化镥中痕量铁的富集及测定研究

采用吡咯二硫代氨基甲酸铵（APDC）沉淀富集高纯氧化镥中痕量的铁,再将沉淀溶于甲基异丁基酮（MIBK）溶液中,分离富集后的溶液用石墨原子吸收法直接测定.当盐酸酸度控制在0.4 mol/L,加2%APDC溶液2 mL,沉淀放置时间为15 min,选取石墨炉原子吸收光谱仪的灰化温度1100℃,原子化温度2300℃时,铁的测定效果最佳.铅、镍、铬、钴、铜等基体元素对铁的测定基本无干扰.该方法具有较好的精密度和准确度,相对标准偏差为4.5%,加标回收率在94.0%～108.0%之间.     

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.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.