负载钛酸锶钡的玻璃纤维滤膜吸附富集-火焰原子吸收光谱法测定痕量铅

制备了负载在玻璃纤维滤膜上的钛酸锶钡多孔块体吸附剂(BBST),研究了该吸附剂对水中Pb2+的吸附富集性能,并考察了吸附和洗脱条件。结果表明:负载在玻璃纤维滤膜上的钛酸锶钡呈多孔叶片状,钙钛矿结构;当介质的pH值大于3时,该多孔块体吸附剂对水中的Pb2+具有很强吸附能力,静态吸附容量为39.75mg/g;对被吸附的Pb2+可用1mol/L硝酸完全洗脱回收,实现对Pb2+的富集,浓集因子为100,方法检出限为0.59μg/L。应用于管网水和河水中痕量Pb2+的富集,用火焰原子吸收光谱法测定,回收率为93%～108%,与石墨炉原子吸收光谱法测定值一致。     

流动注射在线共沉淀火焰原子吸收光谱法测定氯化钴溶液中痕量铅

为解决钴冶金生产中痕量铅的快速监控问题, 将流动注射在线富集分离技术与火焰原子吸收光谱检测方法相结合测定了氯化钴溶液中痕量铅。研究了铅的富集和分离条件, 结果表明, 用填充脱脂棉的微型锥形过滤器作为过滤柱, 以硝酸铁作为共沉淀剂, 在pH10的氨性缓冲介质中铁和铅生成氢氧化物共沉淀, 富集在过滤柱上, 可与高钴基体分离, 过滤柱上铅经盐酸（1+9）洗脱后用火焰原子吸收光谱法测定。在283.3nm波长处测得铅的特征浓度为0.008mg/L（1%吸收）, 检出限为5μg/L, 样品中铅测定结果的相对标准偏差为6.1%（n=11）, 满足了快速分析的要求。     

2-(5-溴-吡啶偶氮)-5-二乙氨基苯酚改性硅胶富集石墨炉原子吸收光谱法测定痕量铟

制备了2-(5-溴-吡啶偶氮)-5-二乙氨基苯酚改性硅胶(5-Br-PADAP-SG),研究了将此硅胶用于富集水样及人工模拟矿渣样中的痕量In(Ⅲ)的条件。结果表明,在pH4时,5-Br-PADAP-SG能定量富集In(Ⅲ),其饱和吸附量为109μg/g,吸附的In(Ⅲ)可被1.0 mol/L的HNO3定量洗脱和用石墨炉原子吸收光谱法测定。分别对管网水样,人工合成矿渣样中的In(Ⅲ)进行了富集和测定,平均回收率为96%。     

微波消解-石墨炉原子吸收光谱法测定土壤中微量钒

建立了微波消解-石墨炉原子吸收光谱法测定土壤中微量钒的方法.确定了微波消解样品和石墨炉原子吸收光谱测定钒的最佳条件.以HNO3-HClO4-HF(3:2:3,V/V)作为样品的消解液,采用两段消解方式进行样品微波消解,并以EDTA作为基体改进剂,在HNO3(ψ=5%)介质中进行钒的测定.方法的检出限为0.72μg/L,线性范围0～300μg/L,相关系数r≥0.998 5.方法用于土壤样品中钒的测定,相对标准偏差小于5%,回收率在98.2%～103.9%之间;有证参考物质的测定值与认定值相符.     

离子交换分离石墨炉原子吸收光谱法测定高纯铟中痕量砷

样品经硝酸溶解、阳离子交换树脂分离后,采用石墨炉原子吸收光谱法测定了高纯铟中痕量砷。研究了溶样方法、离子交换分离和测定砷的条件。结果表明,5 mL硝酸可完全溶解0.4 g铟;采用0.4 mol/L硝酸作为淋洗液进行离子交换后,样品中痕量的铝、铁、锡、铜、铅、锌、镉、镁、铊、银、镍及大量的铟可被分离除去,硅虽然不能与砷分离,但对测定无影响。当进样量为20 μL时,方法线性范围为5～35 ng/mL,检出限为0.8 ng/mL,定量测定下限为0.02 μg/g,比行业标准方法 YS/T 230.3-1994的0.3 μg/g低1个数量级。方法用于实际样品分析,结果与电感耦合等离子体质谱法（ICP-MS）相符,相对标准偏差（RSD,n=8）在1.7%～15.7%之间,加标回收率为95%～110%。     

离子交换树脂分离富集-分光光度法测定铜金精矿及尾矿中银

研究了732型阳离子交换树脂柱分离富集银的条件,建立了光度法测定铜精矿、金精矿及其尾矿中银的方法。实验表明,在pH 2~4的条件下,样品溶液中的银与硫脲络合以［Ag(SCN₂H₄ )₃］⁺形式被树脂吸附后,采用10 mL 0.5 mol/L的硫代硫酸钠溶液可定量洗脱,从而消除了绝大部分共存离子的干扰;树脂柱分离-富集后,硫代米蚩酮光度法测定银的检出限为5.0 μg/L。将本方法用于实际样品分析,测得结果与火焰原子吸收光谱法测定值一致,相对标准偏差(RSD,n=5)小于或等于14%,加标回收率为96%～102%。     

石墨炉原子吸收光谱法测定高纯二硫化钼中铜铅

用硝酸和盐酸溶解高纯二硫化钼样品 ,磷酸二氢铵及硝酸镁溶液作为基体改进剂 ,石墨炉原子吸收光谱法测定高纯二硫化钼中铜、铅。检出限分别为铜 :0.68μg/L ,铅 :1 5 7μg/L。该法快速、简便、准确 ,结果满意     

在线富集-导数火焰原子吸收光谱法测定环境水样中镉

采用单阀双阳离子交换树脂微柱并联 ,设计了双柱交替采样逆向洗脱在线富集系统 ,该系统与原子吸收测量技术相结合 ,实现了在线富集 -导数火焰原子吸收光谱法测定水中镉。富集 1min时 ,分析速度为 60样 /h ,测定镉的特征浓度为0 .0 80 μg/L ,线性范围为 0～ 10 μg/L ,相对标准偏差为 3 .45 % ,检出限为 0 .10 7μg/L。该法对实际水样加标回收率在92.0 %～ 10 6.7%之间     

离子交换分离石墨炉原子吸收光谱法测定高纯铟中痕量铅

样品经盐酸溶解、阳离子交换树脂分离并将试液蒸发浓缩后,用石墨炉原子吸收光谱法测定了高纯铟中的痕量铅。探讨了溶样方法、离子交换分离和测定铅的条件。结果表明:用8 mL盐酸将1 g样品溶解,以0.5 mol/L 盐酸作为淋洗液进行离子交换可把绝大部分铟基体及样品中痕量的银、砷、镉、硅分离除去,随后用2.0 mol/L 盐酸可洗脱铅。干扰试验表明,铝、铜、铁、镁、镍、锡、铊、锌与小于10 μg的铟虽然不能与铅分离,但对测定无影响。当称样量为1 g,定容体积为1.0 mL,进样量为50 μL时,方法线性范围为0.5～4.0 ng/mL,测定下限为0.000 6 μg/g,比行业标准方法 YS/T 230.1-1994的0.1 μg/g低3个数量级。方法用于实际样品分析,结果与电感耦合等离子体质谱法(ICP-MS)相符,相对标准偏差(RSD,n=8)在1.1%～19.7%之间,加标回收率为92%～120%。     

巯基棉分离富集-石墨炉原子吸收光谱法测定环境水样中痕量钴

通过巯基棉分离富集,采用石墨炉原子吸收光谱法成功地测定了环境水样中的痕量钴。对基体改进剂的选择与用量、石墨炉升温程序及干扰因素进行了探究,结果表明:在以8μL100mg/LNi2+溶液作为基体改进剂,灰化温度为650℃,原子化温度为2300℃,氘灯校正背景的条件下测定水样中的钴,可以获得满意结果,大量共存元素不干扰测定。本方法线性范围0.2～20μg/L,检出限为0.12μg/L,回收率为92.7%～106.3%。该法具有简便、快速、灵敏、稳定、准确等优点,可用于环境水样中痕量钴的测定。     

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.