电感耦合等离子体原子发射光谱法测定钢中硫时试样溶解的影响

研究了电感耦合等离子体原子发射光谱法(ICP-AES)测定硫含量时,用王水或硝酸、盐酸溶解样品,保护剂氯酸钾和氧化剂高氯酸对溶解效果的影响。用王水或硝酸溶解样品,测定结果均偏低,氯酸钾的存在与否,测定结果间的显著性差异较小。用硝酸或王水溶解样品,钢中硫部分被氧化溶解进入溶液,另一部分未溶解硫可能呈集合状态以溶胶或悬浮物的形式存在于溶液中,溶液中这种非均质的硫经雾化导入ICP的有效激发区,其光谱激发速率小于硫的逃逸速率,导致ICP-AES测定结果偏低。但是,样品用王水或硝酸溶解后,再经高氯酸冒烟处理,样品中     

石墨炉原子吸收测定岩石样品中痕量金的研究

介绍了低灰分活性炭吸附10%～30%王水溶液中的金,灰化后,王水溶解,采用美国热电原装涂层石墨管测定岩石样品中痕量金。研究了测定时酸度、介质及石墨炉的灰化温度、原子化温度对测定的影响。该方法的检出限达到0.04×10-9,精密度(RSD,n=12)为4%～7%;经国家一级标准物质分析验证,结果与标准值相符。     

火焰原子吸收法测定岩石样品中微量银方法的改进

采用王水分解样品,以10%的王水代替20%HCl浸取样品并作为测定介质,火焰原子吸收法测定岩石样品中的微量银,测定范围为0.3～500g/t。该方法简单、快速,成本低,测定结果准确。     

原子荧光光谱法测定活性炭废物中的砷量

文章介绍了用原子荧光光谱法测定活性炭废物中砷的方法,对仪器的工作条件进行了优化选择,并对王水微波消解前处理测定方法和硝酸-高氯酸-氢氟酸电热板前处理测定方法进行了对比试验。结果表明:硝酸-高氯酸-氢氟酸电热板前处理-原子荧光光度法测定砷,前处理样品能够消解彻底,测定结果稳定,重现性好,适用于实际样品的分析测定。     

断续流动-氢化物发生原子荧光光谱法测定矿石中高含量砷

利用王水分解矿石样品,采用断续流动进样氢化物发生-原子荧光光谱法测定样品中的砷。实验讨论了矿石样品中主量元素对砷测定的干扰及消除方法;分析了测定结果准确性的影响因素,选择了合适的仪器条件、还原剂浓度、测定介质和载流酸度等。在选定的测定条件下,砷的检出限为0.05μg/L,精密度为0.4%,砷的测定结果与国家标准方法测定结果较吻合。采用该方法分别参加了铜、铅、锌精矿的实验室能力验证比对,其结果均为满意。     

超声辅助-王水提取法在测定土壤中重金属元素的应用

建立了超声辅助王水消解土壤样品的前处理方法,并结合电感耦合等离子体原子发射光谱法(ICP-AES)和电感耦合等离子体质谱法(ICP-MS)对土壤样品中铜、锌、镍、铁、锰、铅、砷、汞、铬、镉等10种元素进行测定。通过试验确定王水用量为5mL、超声水浴温度为80℃、超声提取时间为45min的超声提取条件。在优化的仪器条件下,按照实验方法测得的土壤样品中10种元素的校准曲线线性相关系数为0.9996~0.9999;各元素的检出限为0.0021~0.23mg/kg,各元素的测定下限为0.0070~0.78mg/kg。按照实验方法(超声王水提取-ICP-AES/ICP-MS)测定土壤样品中铜、锌、镍、铁、锰、铅、砷、汞、铬、镉,测定结果的相对标准偏差(RSD,n=6)为0.39%~7.8%;除铁、锰的提取值较小外,其他元素的测定结果与采用国标方法(GB 15618—1995、GB/T 22105.1—2008)得到的测定值基本一致;按照实验方法测定土壤标准物质GBW07404、GBW07406、GBW07407、GBW07427中铜、锌、镍、锰、铅、砷、汞、铬、镉,除了锰由于其在原土中主要以氧化物结合态存在,测定结果偏低以外,其他元素测定值与认定值相吻合。     

溶样方法对化探样品中砷锑测定的影响

在地球化学样品分析中,采用传统的王水分解样品一原子荧光法测得的国家标准物质的砷、锑结果往往比标准值低,因此建立了一种采用HF-HNO3-H2SO4混合酸分解样品一原子荧光仪测定地球化学样品中砷、锑的方法。经水系沉积物、土壤和岩石等国家一级标准物质验证,并与传统的王水分解样品一原子荧光法测定结果相比较,发现该方法测定结果与标准值符合得更好,更接近被测元素的全量。     

电感耦合等离子体原子发射光谱法测定废钯炭催化剂中钯

在聚四氟乙烯内衬压力消解罐中,180 ℃的温度下,采用王水消解烘干的废钯炭催化剂样品,建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定废钯炭催化剂中钯的方法。考察溶样方法、消解时间、消解温度和干扰离子对测定的影响。结果表明:废钯炭催化剂先做烘干处理,在180 ℃温度下消解6 h,效果最佳;废钯炭催化剂中存在的Si、Al、Fe、Mg、Ca等元素对钯的测定无影响;钯浓度在0～250 mg/L范围内与强度呈线性关系,加标回收率为99.6%～100.5%,相对标准偏差小于1%。用实验方法与原子吸收光谱法测定同一个废钯炭催化剂样品,两者测定结果基本相符,方法适合废钯炭催化剂中钯的测定。     

微波消解-火焰原子吸收光谱法测定铜精矿中银

以王水为消解体系,采用3步程序升温微波消解法处理样品,选择8%(体积分数)王水为测定介质,实现了火焰原子吸收光谱法(FAAS)对铜精矿样品中1.6~600.0g/t银的测定。干扰试验表明,样品中的铜和铁对银测定的干扰可忽略。在选定的实验条件下,以银质量浓度为横坐标,测得的吸光度为纵坐标绘制校准曲线,其线性相关系数为0.9998。方法检出限为1.6g/t。采用实验方法对3个铜精矿标准物质分别测定11次,测定值与认定值一致,相对标准偏差(RSD)为0.23%~0.66%。选取5组不同银含量的铜精矿样品,按照实验方法测定,并根据测得银含量的不同范围,分别与国标方法GB/T 3884.2—2012中的酸溶-FAAS和火试金-滴定法测得结果进行对比,结果表明,二者基本吻合。     

碘量法测定金泥中的金

介绍了采用活性炭吸附碘量法测定金泥中金含量的实验研究,先用王水溶解试样中的金,经活性炭吸附后炭化、灰化,再采用Na₂S₂O₃标准溶液滴定法测定金泥中的金含量。实验提出了碘量法的最佳条件选择,探讨了活性炭的加入量、过滤速度、碘化钾的加入量、温度和试样的均匀性对金分析结果的影响,并对金泥样品进行了加标回收率实验,金的回收率在97%～108%之间,进行精密度实验（RSD,n=6）,测定相对标准偏差均＜0.50%,对氰化金泥金含量为10%~30%的样品分析结果与火试金重量法结果相吻合。该方法快速准确、低成本且污染小。     

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.