湿法炼锌过程溶液中镍的微分脉冲极谱法测定

在氨-氯化铵缓冲液(pH=10.0)+150g/L柠檬酸钠+2g/L丁二酮肟(DMG)底液体系中,采用微分脉冲极谱法测定湿法炼锌中间溶液中镍的浓度。结果表明:在-0.98V左右产生灵敏的微分脉冲极谱波,镍浓度在8.52×10-7～8.52×10-5 mol/L范围内与相应峰电流有良好的线性关系,检测限为1.7×10-7 mol/L。该方法成功用于湿法炼锌中上清液、一段净化后液、二段净化后液、电积新液、电积废液中镍的测定,RSD分别小于等于0.43%、1.33%、1.92%、2.87%、4.87%,加标回收率为98.4%～102.2%,方法灵敏、简单、快速。     

示波极谱法测定氨浸法炼锌的Zn- NH3- NH4Cl-H2O体系浸出液和净化液中铅

建立了氨浸法炼锌的Zn NH3 NH4Cl H2O浸取体系溶液中铅的测定方法。研究发现示波极谱法测铅时在底液中加入氯化铵能增加方法灵敏度,检测下限可由微量级降低至痕量级。经优化实验,确定了底液的最佳组分为0.6 mol/L盐酸,2 mol/L氯化铵,8×10-5 g/L明胶,7.9×10-7 mol/L抗坏血酸。方法检出限为1.0×10-5 g/L,线性范围为3.48×10-5～0.64 g/L。对样品平行测定6次,RSD为3.3%,测定结果与ICP AES的结果相吻合。该方法可应用于氨浸法炼锌的Zn-NH3-NH4Cl-H2O体系浸出液和净化液中低含量、微量、痕量不同含量范围铅的测定。     

微分吸附计时电位法测定矿石中微量铟

提出了一种测定微量铟的微分吸附计时电位法。以悬汞电极为工作电极 ,在 0.0 1mol/LHAc -NaAc,5× 10 - 7mol/L芦丁底液中 ,测定铟的线性范围为 1× 10 - 1 0 ～ 1× 10 - 7mol/L ,检出限为 5× 10 - 1 1 mol/L。探讨了影响方法灵敏度的主要因素 ,研究了电极过程。本法用于矿石中微量铟的测定 ,得到满意的结果     

二溴对甲基偶氮磺光度法测定铝合金中微量铅

研究了新显色剂二溴对甲基偶氮磺与铅的反应,建立了直接测定铝合金中微量铅的光度分析方法。在0.6mol/L硝酸介质中,铅与二溴对甲基偶氮磺形成1∶2蓝色络合物,最大吸收波长630nm,表观摩尔吸光系数为9.05×104。在25mL溶液中,铅含量在0～50μg符合比尔定律。用于铝合金标样中铅的测定,相对标准偏差RSD为1.85%～4.02%,结果与标准值吻合。本法可用于铝合金中微量铅的直接测定。     

示波极谱法测定氨浸法炼锌的Zn(Ⅱ)-NH3-NH4Cl-H2O体系浸出液和净化液中铅

建立了氨浸法炼锌的ZnⅡ-NH3-NH4Cl-H2O浸取体系溶液中铅的测定方法。研究发现示波极谱法测铅时在底液中加入氯化铵能增加方法灵敏度,检测下限可由微量级降低至痕量级。经优化实验,确定了底液的最佳组分为0.6 mol/L盐酸,2 mol/L氯化铵,8×10-5g/L明胶,7.9×10-7mol/L抗坏血酸。方法检出限为1.0×10-5g/L,线性范围为3.48×10-5~0.64 g/L。对样品平行测定6次,RSD为3.3%,测定结果与ICP-AES的结果相吻合。该方法可应用于氨浸法炼锌的ZnⅡ-NH3-NH4Cl-H2O体系浸出液和净化液中低含量、微量、痕量不同含量范围铅的测定。     

示波极谱法测定锌电解液中微量铅

湿法炼锌过程中 ,锌电解液中微量铅影响电解锌的质量[1 ] ,分析其中的铅含量 ,以便加以控制和调节 ,确保电解锌产品质量。铅的测定主要有EDTA滴定法[2 ] ,但只适于高含量铅的测定 ,以KCl为底液示波极谱法可测定 1× 1 0 - 3 mol/L铅含量[3] ,但尚少见示波极谱法测定锌电解液中微量铅的报道。本法以HCl-NaCl-抗坏血酸为底液 ,示波极谱法测定锌电解液中微量铅 ,操作简便、快速 ,分析结果满意。1　实验部分1 1　仪器和试剂JP 2型示波极谱仪 (成都仪器厂 ) ;三电极系统。铅标准溶液 :0 1mg/mL ,称取 0 1 60 g硝酸铅 ,用 1 0mL硝酸 ( 1 …     

磷酸钕共沉淀火焰原子吸收光谱法测定硫酸钴中痕量铅和铁

本法用磷酸钕 (NdPO4 )作为共沉淀捕集剂 ,分离富集CoSO4 溶液中痕量Pb2 + 和Fe3+ ,用火焰原子吸收光谱法(FAAS)测定。共沉淀受pH ,NdCl3和H3PO4 溶液用量的影响。结果显示 ,在pH 3 .0～ 4.0时 ,NdPO4 能够定量共沉淀CoSO4 溶液中Pb2 + 和Fe3+ ,对于 2 0mL样品溶液 ,铅和铁的检出限分别为 8. 72× 10 - 3mg/L和 2 .5 1× 10 - 2 mg/L ,铅的加标回收率为 10 1.6% ,铁为 10 1.2 % ,排     

催化极谱法测定钢中痕量钒

在 pH4.0的苯二甲酸氢钾介质中 ,有KBrO3存在的情况下 ,V 与邻苯二酚紫 (CV )生成络合物 ,在 -0 83V(vs SCE)处出现一灵敏的极谱峰。峰电流与V 的浓度在 8× 10 - 8～ 2. 4× 10 - 6 mol/L范围内呈线性关系 ,检出限为 2×10 - 8mol/L。体系选择性好 ,灵敏度高 ,用于钢中痕量钒的测定 ,重复性好 ,结果满意。     

络合物吸附波JP303极谱法快速测定锌冶炼中间控制溶液中的镍量

文章探讨了镍与丁二酮肟（DMG）在氨-氯化铵底液中形成的极谱络合物吸附波,建立了快速测定湿法炼锌溶液中微量镍的新方法。丁二酮肟（DMG）-Ni（11）在-1．03V左右形成灵敏的络合物吸附波,镍浓度在5．1×10^-9～5．1×10^-7mol／L时,与相应峰电流有良好的线性关系。检出限为3．0×10^-7moL／L。该法已成功用于锌浸出液、电解新液、废液中镍的测定,样品平行分析相对标准偏差分别小于2．50％、2．77％、2．35％,加标回收率：98．75％～101．5％。     

镉—茜素紫络合物的极谱吸附波及其应用

用线性扫描示波极谱法研究了Cd 茜素紫络合物的伏安行为 ,发现在含有 0.1mol/LKCl,pH4.9的NH4 Cl缓冲溶液中Cd —茜素紫络合物产生一灵敏的极谱吸附波 ,其峰电位为 - 0 6 6V(vs SCE) ,峰电流与Cd 的浓度在 8.0× 10 -8～ 2.0× 10 -6mol/L的范围内呈线性关系 ,检出限为 5.0×10 -8mol/L。研究了电极反应机理 ,并用建立的方法成功地测定了金属铝中痕量镉     

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.