ICP-MS法测定八氧化三铀中钼的测量结果的不确定度评定

介绍了ICP—MS法测定八氧化三铀中钼质量分数的测量不确定度的影响因素。对各不确定度分量进行了分析和计算。八氧化三铀中钼质量分数为29．1μg／g时，测量结果的扩展不确定度为4．2μg／g。     

ICP-MS法测定镝铁合金中钨的测量结果的不确定度评定

研究了ICP-Ms法测定镝铁合金中钨的测量不确定度的影响因素，对各不确定分量进行了分析和计算。镝铁合金中W的质量分数为97.5μg／g时，测量结果的扩展不确定度为7.9μg／g。     

扫描电镜能谱仪测定不锈钢中镍含量测量结果的不确定度评定

为了解扫描电镜能谱仪定量分析结果的准确度,采用扫描电镜能谱仪对SUS-101g不锈钢中镍含量进行定量分析,对影响定量分析结果的不确定度分量包括重复性测定、修正方法、标准物质、实验室环境及设备校准证书等进行逐一讨论,并对各影响因素的不确定度分量进行计算和合成,计算扩展不确定度。测量过程执行标准GB/T 17359—2012《微束分析 能谱法定量分析》。测量不确定度的评定结果表明:影响不确定度的来源主要有重复性测定、修正方法和设备校准证书3个方面,而标准物质和实验室环境的影响根据实际情况可以忽略。不确定度报告可表示为:测定结果镍质量分数为9.92%,扩展不确定度U=0.74%,取包含因子k=1.96。     

一米平面光栅摄谱仪测定地球化学样品中银的不确定度评定

采用一米平面光栅摄谱仪测定地球化学样品中银含量,根据《测定不确定度评定与表示》,对测定结果进行不确定度评定。分析了影响测量不确定度的主要来源,包括称样质量、标准样品定值、摄谱仪的不稳定性、测光仪的不稳定性引入的不确定度分量组成。对影响不确定度的各分量进行量化,并计算得到合成标准不确定度和扩展不确定度。通过计算求得当样品中银的含量为0.36μg/g时,其扩展不确定度(k=2)为0.011μg/g。     

丁二酮肟分光光度法测定合金钢中镍的不确定度的评定

根据JJF 1059-2012《测量不确定度评定与表示》技术规范要求,建立了丁二酮肟光度法测定合金钢中镍的不确定度的测量模型,分析了不确定度的最主要来源,结果表明,标准工作曲线拟合带入的不确定度和标准物质的不确定度为两个重要指标;而其他的则相对较小;用该法测得合金钢中镍的扩展不确定度为0.092mg/g(95%,k=2);这有利于提高实验室在检测合金钢中镍含量的可靠性和准确性。     

碳酸盐型铀矿石中铀的X-射线荧光法测定

建立了碳酸盐型铀矿石中铀元素的X-射线荧光测定法。模拟配制不同CO2含量的碳酸盐型铀矿石样品,采用粉体压片制样,利用X-射线荧光测定其中的铀。通过测定钙、镁质量分数确定CO2质量分数,得出CO2质量分数变化对铀测定干扰呈线性规律,建立了碳酸盐型铀矿石中铀测定通用标准曲线方程,标准曲线方程r≥0.999,相对标准偏差≤1%,检测限6μg/g。该方法制样简单,分析速度快,精密度好,适用范围宽(CO2质量分数0~40%)。     

电感耦合等离子体质谱法测定华阳川铀铌铅多金属矿中铀

采用HF-HNO₃-HClO₄敞开酸溶,HNO₃-H₂O₂复溶的方法进行样品前处理,选用10μg/L¹⁸⁵Re作内标,建立了电感耦合等离子体质谱法(ICP-MS)测定陕西华阳川铀铌铅多金属矿中铀的方法。实验表明,在选定的实验条件下,铀的质量浓度在10~100ng/mL范围内与其质谱强度呈良好的线性关系,校准曲线的相关系数为0.9999,方法检出限为0.007μg/g。采用实验方法测定铀质量分数为8.46~1255μg/g华阳川多金属矿石样品,6次平行测定的相对标准偏差(RSD)为0.71%~1.8%。采用实验方法分析一系列与华阳川铀铌铅多金属矿样成分相似的铀矿石标准物质,相对误差小于2.5%。采用标准方法EJ/T267.5—1984和实验方法进行方法对照,结果表明对质量分数大于200μg/g的华阳川多金属矿样品,二者的分析结果基本一致。     

原子吸收法测定金矿石中金的不确定度评定

针对原子吸收光谱法测定金矿石中金的测试过程, 详细分析了引入的不确定度来源。结果表明,测定结果的不确定度由标准液配制、样品制备、曲线拟合、样品均匀性以及检验重复性等引入的不确定度分量组成, 求得测量结果的标准不确定度和扩展不确定度分别为0.03 μg/g和0.06 μg/g。通过评定得出影响测量准确度的主要因素,需要在以后的工作中严格按照操作规程,不断提高分析测试质量和样品加工质量。     

双指示剂催化光度法测定痕量镍

研究了在氨水介质中,痕量镍(Ⅱ)催化高碘酸钾氧化吖啶红和靛蓝胭脂红褪色的指示反应,通过测量530 nm和610 nm处催化反应体系和非催化反应体系吸光度的变化,建立了双波长双指示剂催化动力学光度法测定痕量镍的新方法。在最佳实验条件下,镍的质量浓度在0~0.04μg/mL范围内与ΔΑ存在线性关系(ΔΑ=ΔΑ530+ΔΑ610),线性方程为ΔA=17.10ρNi2+(μg/mL)-0.001 1,r=0.997 2,方法检出限为0.061μg/L。该方法用于合金中痕量镍的测定,与标准样品含量基本一致。     

碘量法测定粗铜中铜的测量不确定度评定

以碘量法测定粗铜中的铜( YS/T 521.1 -2009)质量分数为例,对测量结果进行不确定度评定.测量结果的不确定度的主要来源包括:称样质量、标准溶液的配制、标准滴定液的标定及样品测定等引入的不确定度四部分,在对各个不确定度分量进行量化的基础上,通过合成得到测量结果的标准不确定度,再乘以95%置信概率下的扩展因子2...     

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

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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.