电感耦合等离子体原子发射光谱法测定高炉炉料中氧化钾、氧化钠、氧化锌

采用电感耦合等离子体原子发射光谱法(ICP-AES)同时测定高炉炉料中氧化钾、氧化钠和氧化锌的含量。样品采用盐酸、氢氟酸、硝酸、高氯酸溶解,在0.6mol/L的盐酸介质中进行测定。对样品中的共存元素铁、钙、镁等的干扰进行了试验,为适应不同系列炉料的分析,分别建立了含铁和不含铁校准曲线,对铁干扰元素进行了校正。方法测定氧化钾、氧化钠和氧化锌的检出限均小于0.2mg/L,背景等效浓度均小于6.0mg/L。该方法用于同时测定高炉炉料中氧化钾、氧化钠和氧化锌的含量,相对标准偏差值均小于2%,回收率在98%～104%之间。     

稀土硅铁合金及镁硅铁合金中钙、镁、锰量的分析方法—ICP-AES法

钙、镁、锰是稀土硅铁及镁硅铁合金产品中重要的指标,采用全谱直读等离子光谱法测定稀土硅铁及镁硅铁合金中的钙、镁、锰量,无须基底匹配,采用工作曲线法对多个元素同时测定,结果稳定可靠。相对标准偏差(RSD)小于2.63%,与其他分析方法相对照,测定结果较为吻合。测定范围:Ca:0.50%～6.00%,Mg:0.20%～11.00%,Mn:0.20%～4.00%。     

ICP-AES法测定工业红矾钠中的杂质元素

红矾钠溶解后、分取一定体积加入高氯酸冒烟,再加入盐酸使Cr元素以氯化铬酰(CrO_2Cl_2)气体形式挥发除去,电感耦合等离子体原子发射光谱法测定钙、镁、铝、锰、铁。该方法避免了铬基体匹配及对杂质元素测定的干扰,结果表明:钙、镁、铝、锰和铁5种元素校准曲线的相关系数均大于0.9990,方法的检出限在0.003～0.027μg/m L之间,相对标准偏差为1.32%～2.31%,加标回收率达到96%～104%,并与火焰原子吸收光谱法的结果进行比对,测定结果相一致。     

电感耦合等离子体原子发射光谱法测定高碳除尘灰中11种元素

实验重点探讨了高含量碳对除尘灰样品中镁、铝、钾、钙、铬、锰、铜、钡、铅、镉、锌等元素测定的影响,并解决了除碳的问题。样品使用马弗炉高温除碳,采用盐酸-硝酸-氢氟酸-高氯酸消解样品灰分,选择了镁、铝、钾、钙、铬、锰、铜、钡、铅、镉、锌等元素的分析谱线和扣背景模式,建立了使用电感耦合等离子体原子发射光谱法(ICP-AES)测定高碳除尘灰中镁、铝、钾、钙、铬、锰、铜、钡、铅、镉、锌等元素的方法。在仪器最佳工作条件下,各元素校准曲线线性相关系数r均大于0.999 5,方法检出限在1.08～26.01 mg/kg之间。方法应用于除尘灰实际样品中镁、铝、钾、钙、铬、锰、铜、钡、铅、镉、锌的测定,结果的相对标准偏差(RSD,n=11)为0.90%～7.1%,目标元素的加标回收率为90%～117%;按照实验方法测定除尘灰中镁、铝、钾、钙、锌,结果与火焰原子吸收光谱法(FAAS)的测定结果相吻合。     

电感耦合等离子体质谱法测定磷酸铁锂中杂质元素

用微波消解技术,以混合酸(盐酸-硝酸-硫酸-双氧水)消解磷酸铁锂样品,建立了电感耦合等离子体质谱法(ICP-MS)测定磷酸铁锂中钠、镁、铝、钙、钛、铬、锰、钴、镍、铜、锌、铅等12种微量杂质元素的分析方法。确定了最佳实验条件如下:采用普通模式测定元素铅,氦碰撞模式测定钠、镁、铝、钛、铬、锰、钴、镍、铜、锌,氢气反应模式测定钙;碰撞气He气流速为5.6 mL/min,反应气H₂的流速为6.2 mL/min;钠、镁、铝、钙、钛采用钪为内标进行基体校正,铬、锰、钴、镍、铜、锌采用铱进行校正,铅采用铋进行校正。方法检出限在4.5～28.9 ng/L之间。采用实验方法对磷酸铁锂实际样品中各元素进行测定,结果的相对标准偏差(RSD,n=11)在0.6%～1.9%之间,加标回收率为94%～107%。方法测得结果与电感耦合等离子体原子发射光谱法(ICP-AES)进行对比分析,结果基本一致。     

雾化气流量对ICP-AES测定钾长石中钾、钠、钙、镁、铝、铁和钛的影响

采用氢氟酸、盐酸、硝酸、高氯酸分解样品,电感耦合等离子体原子发射光谱法(ICP-AES)同时测定钾长石中CaO、MgO、Al₂O₃、Fe₂O₃、TiO₂、K₂O、Na₂O。在选择待测元素的分析谱线及背景校正方式基础上,考察了雾化气流量分别在1.0、 0.6、 0.5、0.4 L/min时对钾、钠、钙、镁、铝、铁、钛等元素的谱线强度、测定结果的精密度以及校准曲线线性影响。当雾化气流量为0.4 L/min和0.5 L/min时各元素测定结果的精密度最好,校准曲线线性相关系数均大于0.999;但雾化气流量为0.5 L/min时各元素谱线强度最高,因此选择雾化气流量为0.5 L/min。根据确定的雾化气流量,用ICP-AES对GBW03116钾长石标准物质中上述6种组分进行测定,测定值与认定值的相对误差(RE)在-3.64%~4.26%之间, RSD(n=11)为0.76%~4.2%。     

电感耦合等离子体原子发射光谱法测定硫酸氧钒中钙镁镍铜铝铁

采用盐酸溶解样品,使用基体匹配法配制校准曲线消除基体效应的影响,选择Ca 317.933 nm、Mg 285.213 nm、Ni 211.647 nm、Cu 324.754 nm、Al 396.152 nm、Fe 238.204 nm作为分析线,电感耦合等离子体原子发射光谱法(ICP-AES)测定硫酸氧钒中钙、镁、镍、铜、铝、铁。进行了1.6 mg/mL钒离子和3.0 mg/mL硫酸根共存体系中基体效应、光谱干扰和连续背景叠加对待测元素测定的影响试验。结果表明,该质量浓度的硫酸根离子对测定不产生影响,而钒对部分待测元素谱线产生光谱干扰,钒基体效应对待测元素均产生正干扰。采用钒基体匹配和同步背景校正相结合的方式消除钒基体的影响,并且优选出未受光谱干扰的各待测元素分析谱线及其背景校正和检测区域,根据试验结果确定了ICP-AES工作条件。钙、镁、镍、铜、铝、铁的质量分数在0.000 1%～0.10%范围内与发射强度成线性,各元素校准曲线的相关系数均大于0.999,背景等效浓度为-0.000 3%～0.000 4%,方法中各元素的检出限为0.000 1%～0.000 3%(质量分数)。按照实验方法测定硫酸氧钒中钙、镁、镍、铜、铝、铁,结果的相对标准偏差(RSD,n=8)为2.6%～14%。实验方法用于测定2个硫酸氧钒样品中钙、镁、镍、铜、铝、铁,结果与电感耦合等离子体质谱法(ICP-MS)的测定结果相吻合。     

碱熔-EDTA滴定法测定铬铁矿中钙和镁

用过氧化钠熔融分解试样,在强碱性条件下沉淀分离基体及铬、硅,控制溶液pH 6~7,用六次甲基四胺和铜试剂沉淀分离铁、铝、钛等干扰元素,再采用两种不同浓度的EDTA标准滴定溶液对滤液中的钙(以氧化钙计)和镁(以氧化镁计)分别进行滴定,建立了测定铬铁矿中钙和镁的方法。采用电感耦合等离子体原子发射光谱法(ICP-AES)对沉淀法分离铬后滤液中的钙进行了测定,结果表明,滤液中钙含量与样品中钙含量相比可忽略不计。干扰试验表明,试样中的共存元素均不干扰测定。按照实验方法对GTK-1铬铁矿样品、GBW 07820GCr-3铬铁矿标准物质和GSBD 33001-94铬铁矿标准物质中钙和镁进行测定,测定值与认定值一致,结果的相对标准偏差(RSD,n=8)在0.25%～4.9%之间,方法的极差在GB/T 24221-2009规定的允许差范围内。     

火焰原子吸收测定铝合金中Cu、Fe、Ca、Mg

本文以6063铝合金作对象(Al>98%、Si<0.6%、Mg 0.45～0.9%、Fe<0.35%、Cu<0.1%),探讨用火焰原子吸收法快速测定该材料中微量元素铜、铁、钙、镁的分析方法和干扰情况.通过实验发现:样品中铜、铁不受基体元素铝的干扰,而钙、镁受基体元素铝的干扰,加入SrCl_2后,干扰可被消除,方法简单、快速.一、仪器及主要试剂美国SpectraAA-30原子吸收光谱仪;DS-15计算机控制系统;铜、铁、钙、镁各单元素空心阴极灯.     

连续光源火焰原子吸收光谱法测定氧化镍中钴铜锌铁钙镁

采用盐酸溶解样品,选择Co 240.72nm、Cu 324.75nm、Zn 213.86nm、Fe 248.33nm、Ca 422.67nm、Mg 202.58nm作为分析谱线,钴、铜、锌、铁选择3个像素点,钙、镁选择9个像素点,建立了连续光源原子吸收光谱法(CS-AAS)同时测定氧化镍中的钴、铜、锌、铁、钙、镁的方法。实验表明:在100mL测定液中加入2mL 200g/L氯化锶溶液,可消除测定介质(体积分数为2%的盐酸)对待测元素的影响;基体镍对测定的干扰可忽略。在优化的实验条件下,钴、铜、锌、铁、钙、镁的校准曲线相关系数均不低于0.999 0,且其方法检出限在0.002~0.092μg/mL之间。按照实验方法对氧化镍样品中钴、铜、锌、铁、钙、镁分别平行测定11次,钙和镁的测定值在0.1%~0.4%之间,其对应的相对标准偏差(RSD)不大于2%;钴、铜、锌、铁的测定值在0.003%~0.04%之间,其对应的相对标准偏差均小于10%。将实验方法应用于电真空镍光谱标准样品(该标样为氧化镍状态)中上述各元素的测定,结果与认定值基本一致。     

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.