流动注射离子交换分离-火焰原子吸收光谱法测定痕量铋

研究了采用流动注射技术进行痕量铋的离子交换分离富集 ,在 0 2mol/LHCl溶液中 ,Bi3 + 与Cl- 形成阴离子 ,被离子交换树脂交换富集 ,用 0.2mol/L硝酸 -1 2 %柠檬酸溶液洗脱 ,火焰原子吸收光谱法测定。经分离后 ,铋的测定灵敏度可提高数倍 ,大量共存离子不干扰铋的测定。方法用于钢铁及合金中微量铋的测定 ,结果令人满意。     

流动注射在线离子交换分离富集-氢化物发生原子荧光光谱法测定铜合金中痕量铋

提出了一种流动注射在线离子交换分离富集-氢化物发生原子荧光光谱法测定铜合金中痕量铋的方法。在1 mol/L HCl介质中,Bi3+与Cl-生成稳定的络阴离子,被吸附于717强碱性阴离子树脂,用0.75 mol/L HNO3与0.05 mol/L柠檬酸的混合液洗脱,并在线引入石英炉以原子荧光光谱法测定。设计了流动注射在线离子交换分离富集及氢化物发生流路和操作程序,优化了各项化学条件及操作参数。方法的检出限为0.04 ng/mL,铋量在0.04~50ng/mL范围内有良好的线性关系。对5 ng/mL铋平行测定     

717型阴离子交换树脂分离富集 光度法测定

研究了717型阴离子交换树脂柱分离 富集钼的条件,建立了光度法测定铜精矿和尾矿中微量钼的方法。在pH为7.5的条件下,钼以MoO４２ 形式被717型阴离子交换树脂定量吸附后,采用2 mol/L HNO3和0.5 mol/L NH4NO3混合溶液定量洗脱,消除了绝大部分共存离子的干扰。通过树脂柱分离 富集后,用硫氰酸钾分光光度法测定钼的检出限为5.6 μg/L,相对标准偏差（RSD）为2.2 % (n=5),加标回收率在96.2 %～105.7 %之间,实际样品测定结果与ICP AES方法测定值基本一致。     

离子交换分离EDTA滴定法测定黄铜中锌

用电解法分离基体铜后,电解液经强碱性阴离子交换柱,使锌与其他元素分离;以0.5 mol/L硝酸作洗脱液,洗脱树脂吸附的锌;用二甲酚橙为指示剂,EDTA滴定法测定洗脱液中的锌。对阴离子交换树脂分离锌的条件进行了研究。结果表明,上柱溶液中盐酸浓度为2 mol/L,洗脱液硝酸浓度为0.5 mol/L,洗脱速度在6～8 mL/min时锌的回收率较高。用本法测定了黄铜标准样品中的锌,测定结果与认定值相符,加标回收率在98.7%～100.5%之间。     

电感耦合等离子体原子发射光谱法测定二氧化铀中痕量钍

采用717型阴离子交换树脂分离试液中钍,建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定二氧化铀中痕量钍的新方法。介绍了阴离子交换柱的制备方法,通过试验选择0.01mol/L硫酸为淋洗液、6mol/L盐酸为洗脱液,使钍与铁、钙、镁、铀等干扰元素得到较好地分离;同时考察了分析谱线、载气流量等因素对测定的影响,优选了最佳测定条件。方法标准加入回收率为101%,相对标准偏差(n=6)为5.4%。标准物质的测定结果与认定值相符合。     

离子交换树脂分离富集-催化荧光猝灭法测定痕量钒

在pH 5.2的邻苯二甲酸氢钾-氢氧化钠介质中,痕量钒对高碘酸钾氧化3-(4'-甲基苯基)-5-(4'-甲基-2'-磺酸基苯偶氮)若丹宁(M4MRASP)产生荧光猝灭作用,且猝灭程度与钒量成正比,由此建立了催化荧光猝灭法测定痕量钒的新方法。该体系最大激发和发射波长为λex=309nm,λem=407 nm,测定了反应表观活化能为39.24 kJ/mol,反应速率常数为0.274/s。方法测定钒的线性范围为0.15~14.0μg/L,检出限为8.9×10-8g/L。采用强碱性阴离子交换树脂分离富集,在pH 7.0~8.2的范围内能定量吸附钒,交换后的树脂用1.0 mol/L硫酸淋洗即可以把钒洗脱,消除了共存离子的干扰。用于实际样品中痕量钒的测定,RSD≤3.1%,标准加入回收率在98.3%~103.4%之间;测定结果与ICP-AES法结果基本一致。     

萃淋树脂分离富集-催化褪色光度法测定电镀废水中痕量铬Ⅵ

样品溶液以1.0 mL/min的流量通过微型树脂交换柱交换分离后,样品中Cr(Ⅵ)被磷酸三丁酯(TBP)萃淋树脂吸附,用0.5 mol/L HCl和水分别进行淋洗,Cr(Ⅵ)与样品中Fe³⁺、Al³⁺、Cr(Ⅲ)等干扰测定的金属离子分离,从而实现了对CrⅥ的分离富集。在0.05 mol/L H₂SO₄介质中,痕量CrⅥ强烈催化高碘酸钾与核固红的氧化褪色反应,基于该种作用,建立了一种新的测定痕量CrⅥ的催化光度法。体系的最大吸收波长为555 nm,CrⅥ在0~10.0 μg/L范围内符合比尔定律,方法的检出限为2.01×10^-2 μg/L。方法用于测定电镀废水中痕量CrⅥ,测定结果与电感耦合等离子体原子发射光谱法(ICP-AES)相符,6次测定值的相对标准偏差(RSD)小于4%。     

阴离子交换分离—CAS-CTMAB分光光度法测定钽铌中微量铝

钽、铌中微量铝的测定,曾采用将基体钽、铌用碱熔水浸分离,铝试剂光度法测定,以阴离子交换分离钽,铜试剂—三氯甲烷萃取其它杂质,而后用8—羟基喹啉萃取比色法测定。这些方法存在着或者分离手 续冗长,或者分离效果不佳,显色条件要求相当苛刻等不足之处。 本工作提出以强碱性阴离子交换树脂吸附除去钽、铌,用邻菲啰啉、硫代乙醇酸和抗坏血酸掩蔽其它干扰离子,以铬天青S(CAS)—溴     

固相分光光度法测定石煤渣中痕量钽

在0.30mol/LHCl介质中钽吸附于树脂上,再与5 Br PADAP反应生成有色络合物,在最大吸收波长575nm处,对树脂相直接进行光度测定,建立了固相分光光度法测定痕量钽 的新方法。钽的质量浓度在0～200μg/L范围内符合比尔定律,其表观摩尔吸光系数为2.75×106。该法已应用于石煤渣中痕量钽的测定,获得了满意的结果。     

巯基棉富集分光光度法测定石煤渣中痕量钽

痕量钽(被巯基棉预富集后用分光光度法进行测定。在H2SO4介质中,Triton X-100存在下,钽(与丁基罗丹明B(BRB)发生显色反应,生成摩尔比为1∶1的稳定络合物,络合物的最大吸收波长为565 nm,表观摩尔吸光系数为1.46×105L.mol-1.cm-1,钽的质量浓度在0~600μg/L范围内符合比尔定律。经巯基棉富集后,钽的测定灵敏度可提高数倍,大量共存离子不干扰钽的测定。建立的方法应用于石煤渣中痕量钽的测定,分析结果的相对标准偏差小于5%,加标回收率在97%~103%之间。     

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

正~~     

Zinc Production by Province in 2014

正~~     

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.