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针对分析人员对标准物质概念不清、使用不规范等问题,就环境监测领域标准物质选择和应用方法做了梳理。从标准物质的概念、区分有证和非有证标准物质的方法、标准物质的应用范围及标准物质的使用注意事项等4个方面系统地进行了梳理,重点阐述了有证标准物质和非有证标准物质的概念区别及使用时的误区,为分析人员在实际工作中出具准确数据提供理论依据。 相似文献
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对一级军用标准物质JBWY05901钨合金标准物质稳定性检验的化学分析方法进行了比较选择,提出了该标准物质稳定性检验方法,给出了检验数据的统计处理方法及稳定性检验结果。 相似文献
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建立黄豆黄素纯度标准物质的研制方法。选择纯度大于98%(质量分数)的黄豆黄素标准品作为标准物质候选物,通过加热和冷冻干燥去除多余的水分。通过红外、质谱、核磁氢谱进行结构确证和表征后分装,采用质量平衡法进行均匀性和稳定性检验。结果显示,标准物质均匀性良好,在常温条件下保存12个月稳定;采用质量平衡法和定量核磁法进行纯度定值,质量平衡法的定值结果为99.09%,定量核磁法的定值结果为99.13%,取平均值99.1%作为最终定值结果;对定值、均匀性和稳定性引入的不确定度进行了系统评定,扩展不确定度为0.3%(k=2)。研制的黄豆黄素纯度标准物质已申报国家一级标准物质,编号为GBW 10171。该标准物质可用于食品、保健品、饲料中黄豆黄素含量检测。 相似文献
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对气相反应物质,可以选择两种标准态,推导了不同标准态下气相基元反应的速率常数及活化能的表达式,指出了不同标准态下活化参数之间的关系 相似文献
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A review of publications on the creation and application of certified reference materials for the chemical analysis of geological materials and environmental objects with the aim to ensure the uniformity of measurements is presented. 相似文献
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A. elková Jana Kubová Vladimir Streko 《Fresenius' Journal of Analytical Chemistry》1996,355(2):150-153
A continuous hydride generation (HG) AAS procedure for the determination of As in geological samples utilizing the SH-group containing amino-acid L-cysteine for the pre-reduction of As(V) to As(III) in HNO3 has been optimized and compared with a method utilizing KI and ascorbic acid in HCl. The influence of some transition metals (Co, Fe, Ni) on the determination of As has been investigated. Decompositions of geological certified reference materials, sediments and soils of different origin and geochemical composition with concentrated HNO3 have been performed in open and closed systems and the resulting As content has been compared with certified and proposed data. 相似文献
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石墨炉原子吸收光谱法测定地质样品中的痕量金 总被引:6,自引:0,他引:6
用活性炭吸附,于5%盐酸溶液中用甲基异丁基酮(MIBK)萃取金,采用斜坡升温和热解涂层石墨管技术进行地质样品中痕量金的石墨炉原子吸收光谱法测定,检出限为0.1ng/g。用该方法对标准物质进行测定,结果与标准值相符,测定结果的相对标准偏差为2.0%~6、9%(n=6)。 相似文献
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Wolfhard Wegscheider Michael Zischka 《Fresenius' Journal of Analytical Chemistry》1993,346(6-9):525-529
Summary Quality assurance in environmental research is related to reliable analytical methods. According to this fact great efforts were taken in the German Cooperative Project sponsored by the Ministry of Research and Technology Emissions of Precious Metals to ensure the quality of all analytical data from various research groups. As there are only few certified reference materials (CRMs) for platinum available and the application of reference materials is an important measure in quality assurance and quality control actions in every laboratory, several materials have been prepared with low and elevated platinum contents as reference samples for this project. These reference samples were a catalyst sample with elevated platinum content, a dust reference material with low platinum content and a catalyst reference material with low platinum content. With these reference samples and the Canadian geological reference material SU-1a interlaboratory studies were conducted and the results of these are presented in this paper.Dedicated to Professor Dr. Wilhelm Fresenius on the occasion of his 80th birthday 相似文献
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建立了泡沫塑料吸附-电感耦合等离子体原子发射光谱法测定地质样品中的金的方法,采用王水溶解地质样品中痕量的金,经泡沫塑料吸附富集,结合电感耦合等离子体原子发射光谱法进行测定。实验表明,方法的加标回收率为94.4%~111.0%,对国家一级标准物质进行测定,结果与认定值一致,方法的相对标准偏差RSD为3.2%~12.8%。 相似文献
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电感耦合等离子体质谱法测定地质样品中铂、钯、钌、铑、铱和金 总被引:17,自引:0,他引:17
研究Te共沉淀分离富集、ICP-MS铂族元素和金测定方法。方法检出限 1~9 pg/g;回收率≥90%。国标GBW07288-GBW07294、加拿大WGB1及南非铂矿SARM7等标样分析表明:结果满意,方法可靠。 相似文献
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Uwe Voellkopf M. Paul E. R. Denoyer 《Fresenius' Journal of Analytical Chemistry》1992,342(12):917-923
Summary ICP-Mass spectrometry is typically used as a technique for very rapid multielement analysis at trace and ultra-trace levels of solutions by continuous sample aspiration and nebulization. However, ICP-MS is well suited to be used as a detector for other sample introduction devices. For the analysis of solid samples laser sampling and electrothermal vaporization accessories may be used as sample introduction devices for ICP-MS. Laser sampling permits the analysis of many different types of solid materials. For solid sampling ETV-ICP-MS analysis it is of advantage to reduce the sample to a fine powder prior to analysis. For automated analysis powders may be introduced as slurries into the graphite furnace by means of a slurry sampling device. Since appropriate certified solid reference materials are not always available for calibration, or since they are not certified for all analyte elements of interest, the analyses discussed in this contribution were performed semiquantitatively. The instrument response function was established using reference materials which were similar in their composition to the samples. The results of semiquantitative bulk analyses of glass (NIST 612) and geological material (USGS GXR-3) by laser sampling ICP-MS are in good agreement with the certified values. The concentrations of the analytes determined in the glass sample were in the range of 10 g/g to 80 g/g. The lowest analyte concentration in the geological sample was 0.4 g/g (Eu) and the highest was approximately 186 mg/g (Fe). The precision achieved was in the order of 5% to 15%. Laser sampling ICP-MS is not only suitable to bulk analysis but also to analyses where spatial information is required. As an example for such an application the determination of Pb in a wine bottle cork stopper is dicussed. The slurry sampling technique was used for the semiquantitative analysis of NIST coal reference samples by electrothermal vaporization ICP-MS. The accuracy achieved with this approach was within a factor of ±2 of the reference values. 相似文献
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Fit-for-purpose shellfish reference materials for internal and external quality control in the analysis of phycotoxins 总被引:1,自引:0,他引:1
The need for reference materials for quality control of analysis of foodstuffs has been stressed frequently. This has been
particularly true in the phycotoxins field, where there is a great shortage of both pure calibration standards and reference
materials. Worldwide there are very few independent bodies that produce certified reference materials for phycotoxins, the
main producers currently being the National Research Council Canada and the Japanese Food Research Laboratory. Limited availability
of contaminated shellfish and algae, as well as the time and knowledge necessary for the production of adequate reference
materials, continuously lead to limited editions of certified reference materials and even more limited production of in-house
reference materials. The restricted availability of in-house quality control materials promotes the rapid use of the limited
certified reference materials, which in turn hampers the production of the suite of materials required globally for complete
protection of public health. This paper outlines the various options that analysts can pursue in the use of reference materials
for internal and external quality control, with a view to optimising the efforts of both reference materials users and reference
materials producers. For this purpose, the logical sequence is reviewed from the discovery of a new bioactive compound in
shellfish, through initial method development up to regulation for food safety purposes including accepted reference methods.
Subsequently, the requirements for and efforts typically spent in the production and characterisation of laboratory reference
materials, certified reference materials and other test materials used in inter-laboratory studies or proficiency testing,
in the area of marine biotoxins are evaluated. Particular emphasis is put on practical advice for the preparation of in-house
reference materials. The intricate link between reference material characterisation and method performance is outlined to
give guidance on the appropriate in-house method validation in the rapidly developing field of phycotoxins.
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Xiongxin Dai Zhifang Chai Xueying Mao Hong Ouyang 《Journal of Radioanalytical and Nuclear Chemistry》2000,245(1):47-49
The Ir, Au and Pd concentrations in three certified reference materials SARM-7, FC-1 and DZ-1 were determined by neutron activation analysis using -amino pyridine preconcentration. Good agreement between the reference values and our results was obtained, and the reliability of our method was confirmed. This method is suitable for ppb or sub-ppb levels of Ir and Au analyses in environmental and geological samples. The Ir and Au levels in a Chinese coastal sediment GBW07314 were also analyzed. 相似文献