火焰原子吸收分析中的原子捕集技术

在原子吸收分析中,火焰原子吸收法仍占主导地位。众所周知,常规火焰原子吸收法是采用气动喷雾进行原子化的,该法雾化效率通常为7～12％,再加之大量载气的稀释,到达火焰供原子吸收测定的原子也就相当稀薄了。另一方面,由于火焰燃烧速度很快,原子在火焰中的停留时间很短(10~(-3)秒),因与供测定的时间也就极为有限。如设计出一种原子化装置,它能达到以下几点要求之一,都能提高火焰原子吸收法的灵敏度:(1)能增加吸收光程的长度;(2)能减少载气的稀释;(3)能增加原子在火焰中停留的时间;(4)能使原子在火焰中     

富氧火焰原子吸收法测定钢中夹杂物内微量钙和镁

钢中夹杂物内氧化钙、氧化镁含量约为 0.0 0 0 0 1%～ 0.0 0 1% ,空气 -乙炔火焰原子吸收法测定微量钙、镁 ,吸光度很低。试验表明 ,用富氧空气 -乙炔火焰原子吸收法进行测定 ,吸光度相对提高 ,从而建立了富氧火焰原子吸收测定钢中夹杂物内氧化钙和氧化镁的分析方法。     

火焰原子吸收光谱法测定精铟中铅

试样用盐酸溶解，在稀盐酸介质中，利用氘灯扣背景消除铅的背景干扰。使用空气-乙炔火焰，于原子吸收光谱仪波长283.3nm处测定铅。铅测定范围0.00l-00025％。     

火焰原子吸收光谱法测定镉锭中的铁

火焰原子吸收光谱法采用试样用硝酸溶解，直接用原子吸收测定，回收率在96％～102％之间，变异系数小于7％。方法操作简便快速，适合日常生产分析。     

原子吸收分光光度法测定铁矿中铁、氧化锰

将火焰原子吸收分光光度法应用于铁矿的系统分析，成功地测定了全铁和氧化锰。提出了火焰原子吸收分光光度法测定铁矿中全铁和氧化锰的方法。本法简便、快速、准确。     

火焰原子吸收光谱法测定铜钴矿中镍、锌、锰、钙和镁量

研究了用火焰原子吸收光普法测定铜钴矿中镍、锌、锰、钙、镁，选择了测定的最佳条件，方法简便可靠，加标回收率98．8％－103．5％，相对标准偏差＜5．2％。     

原子吸收—氢化物法测定废水中的微量砷

原子吸收分光光度法测定废水中的微量砷,目前常用的有火焰法及无火焰法等。火焰原子吸收法灵敏度较低,无火焰原子吸收法灵敏度虽高,但重现性差。本法采用一种无载气简易氢化物发生器装置,利用雾化器产生的负压将发生器内产生的砷化氢气体直接导入空气——乙炔火焰进行原子吸收测定。本方法具有操作简便,快速准确,干扰少等优点,其相对灵敏度为0.0019微克/毫升,比待测溶液直接导入火焰原子吸收法(0.2微克/毫升)提高约100倍,相对标准偏差小于2％。使在不预先富集分离水样的条件下,可直接测定工业     

N,N—二仲辛基乙酰胺萃取原子吸收光谱法测定矿石中金

介绍在5％HCl介质中,用DOAA的乙酸丁酯萃取矿石中的微量金,并以空气-乙炔火焰原子吸收法直接在有机相中进行测定。     

原子吸收法测定矿石中痕量金

本文提出用o.4％硫脲溶液解脱泡沫塑料吸附金,解脱液可直接用火焰法或石墨炉法测定ppb～ppm含量的金,测定范围宽,应用范围广。回收率在97～110％之间,灵敏度为2.5×10~(-11)g/l％,定量下限3ppb,相对标准偏差为6.1％。 目前,广泛采用火焰原子吸收法测定ppm含量金,无焰原子吸收法测定ppb含量金,火焰法和无焰法对金的富集分离。     

双毛细管雾化器氢化物—火焰原子吸收法测定地质样品中砷、锑、铋、汞

采用双毛细管雾化器、氢化物火焰原子吸收测定砷、锑、铋、汞的方法比常规的火焰原子吸收法具有简便,快速、灵敏、成本低、效率高的优点.一次称样可以测定四个元素,文中用MGD标准样品证明了方法的可靠性。方法可应用于选矿产品以及地质组合样品中0.001％以上的砷、0.0001％以上的锑,铋和汞的测定.     

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.