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研究二溴对甲基偶氮磺与铅的反应,建立了直接测定金属锌中铅含量的光度分析方法.在0.144 mol/L盐酸介质中,铅与二溴对甲基偶氮磺形成蓝色配合物,最大吸收波长为630 nm,表观摩尔吸光系数为8.34×104;在25 ml的溶液中,铅量在0~60 μg范围内符合比尔定律.显色反应具有很好灵敏度和选择性,主要共存离子均有较大允许量.可用于金属锌中铅的直接测定,测定结果与理论值相符,RSD为1.85%~2.56%. 相似文献
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二溴对甲基偶氮甲磺属磺基变色酸双偶氮类试剂,能与钡、锶、铅等发生颜色反应~[1]。目前已报道该试剂可用于铝合金中痕量锶~[2]、铜合金中微量铅~[3]和钛酸钡烧结物中微量钡的测定~[4],但未见用于钢铁分析中的报道。本文考察了在酸性条件下,试剂与锶生成络合比为2:1的蓝色络合物,其λ=638nm,ε638=5.01x104,灵敏度较文献~[5]提高近3倍,且方法具有简便、快速,选择性较好,显色酸度范围宽,可在多种酸的介质中进行,分析结果准确性较好等特点。用该试剂可不经分离直接测定钢中微量锶,结果满… 相似文献
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钢及铜合金中微量稀土的测定有用铜试剂沉淀分离—偶氮胂Ⅲ比色法,也有用偶氮氯膦Ⅲ直接比色法测定球铁、低合金钢及铝合金中稀土。但对测定铅锑合金中微量稀土,由于基体中含有大量Pb和Sb,直接采用上述方法有一定困难。 本工作研究了用DDTC沉淀分离大量铅锑与微量稀土的条件,试验了稀土的偶氮氯膦Ⅲ—溴化十六烷基三甲基铵比色测定条件,提出 相似文献
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研究了铋(Ⅲ)与二溴对甲基偶氮甲磺的显色反应及其应用.结果表明在酸性介质中,该试剂与铋(Ⅲ)形成稳定的蓝色络合物,配合比为12,其最大吸收波长为645nm,表面摩尔吸光系数为1.0×105,铋(Ⅲ)在0~25μg/25mL范围内符合比尔定律.将该方法用于铸铁、铜合金中微量铋的测定,获得了满意的结果. 相似文献
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<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 相似文献
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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, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
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. 相似文献
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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. 相似文献
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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. 相似文献