共查询到20条相似文献,搜索用时 46 毫秒
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ICP-AES测定湖泊水中的多种微量元素 总被引:1,自引:0,他引:1
采用电感耦合等离子体发射光谱法(ICP-AES)对湖泊水体样品中P、Mn、Sr、Ca、Mg、Fe、A17种次量和微量元素进行同时测定.实验表明方法的线性范围宽,检出限低,灵敏度高.测定7种元素检出限低,<0.01 mg/L(P为0.057 mg/L),相对标准偏差RSD在0.3%~1.9%,天然水样加标回收率都在86%~107%之间,通过对两个水样标准物质GBW(E)080668、GBW(E)080670进行分析,测定值均在标准值范围内,说明方法准确度高.该方法简单、快速、灵敏、准确,适用于湖泊水体样品中P、Mn、Sr、Ca、Mg、Fe、Al 7种次量和微量元素的同时测定. 相似文献
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火焰原子吸收/发射光谱法测定湖泊水中的钾钠 总被引:2,自引:0,他引:2
采用火焰原子吸收/发射光谱法测定湖泊水中的钾、钠离子含量。优化了负高压灯电流等仪器条件,在选定的最佳实验条件,测定钾、钠的方法检出限分别为0.014μg/mL和0.03μg/mL。钾离子RSD值分别为1.46%、1.21%,钠离子RSD值分别为1.65%、0.66%。样品中钾的回收率为96.0%~103.5%,钠的回收率为95.8%~102.0%。对国家水标准物质进行分析,分析结果与标准值一致。本方法操作简单,灵敏度高,结果准确稳定。 相似文献
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氢化物发生原子荧光法测定陆地水中痕量砷 总被引:1,自引:0,他引:1
研究用高灵敏度氢化物发生-原子荧光光度法测定陆地水(长江、汉水、东湖、墨水)中的痕量砷.试验考察了离子干扰,确定了最佳工作条件.500 mg/L(Fe3+、Pb2+、 Mn2+、 Cu2+、Ca2+、Na+、K+、Mg2+)并不影响As的测定,在最佳条件下,砷的检出限为0. 092 ng/mL,精确度为3. 82%,用于测定砷水样国家标准物质,测定结果与标准值一致.方法灵敏度高,精密度好,操作简便、快速,可用于湖泊水生态环境调查评价样品中痕量砷的测定. 相似文献
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硒样品经硝酸和盐酸溶解后,加入氯化羟胺将硒(Ⅵ)还原成单质硒,使基体与杂质元素分离,用氢化物发生-原子荧光光谱法测定样品中微量铋.研究了氢化物发生的介质和酸度、硼氢化钾溶液浓度、预还原剂用量、预还原时间、氯化羟胺用量、共存元素等因素对测定结果的影响.在最佳测定条件下,铋的质量浓度在0 ~ 100 ng/mL范围内与荧光强度呈良好线性关系,相关系数大于0.9995,方法的检出限为0.18 ng/mL,加标回收率在96%~106%之间.本法测得结果和电感耦合等离子体原子发射光谱法(ICP-AES)基本一致,相对标准偏差(n=11)小于10%. 相似文献
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Gao Wei 《中国稀土信息(英文版)》2014,(11)
正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium 相似文献
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YANG Li 《中国稀土信息(英文版)》2014,(6)
<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy 相似文献
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《中国稀土信息(英文版)》2014,(8)
正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared 相似文献
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<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth 相似文献
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《中国稀土信息(英文版)》2014,(6)
正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products 相似文献
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《中国稀土信息(英文版)》2014,(10)
<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why 相似文献
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《中国稀土信息(英文版)》2014,(8)
正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets. 相似文献
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<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel 相似文献
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《中国稀土信息(英文版)》2014,(12)
正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow. 相似文献
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分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求. 相似文献