共查询到17条相似文献,搜索用时 125 毫秒
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以商购罗丹明B为原料,进行重结晶提纯,制备罗丹明B纯度标准物质。采用红外光谱(IR)、高分辨质谱和核磁共振谱(NMR)进行定性分析。样品分装400瓶后,依据国家《一级标准物质研制技术规范》,采用液相色谱-二极管阵列法对随机抽取的15瓶样品进行均匀性检验,经F检验表明,在95%的置信区间范围内,样品均匀性良好。在室温下,经过30个月稳定性考察,结果表明样品稳定性良好。标准物质经国内8家具有分析资质的实验室进行协同定值,定值结果为99.0%,扩展不确定度为1.0%(k=2)。该标准物质达到了国家标准物质的技术要求,可用于有关罗丹明B的分析方法校正和质量控制。 相似文献
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The preparation and certification of reference materials is a rapidly developing area. Many innovative reference materials
have limited homogeneity and stability, and, additionally, the uncertainty estimation of the property values must be brought
in agreement with the principles of the “Guide to the expression of uncertainty in measurement” (GUM). The results of the homogeneity and stability studies must be included to a certain extent in the uncertainty of the
property values of the reference material, in order to comply with these requirements. The basic theory needed to accomplish
this is essentially the theory of analysis of variance (ANOVA). As GUM also allows alternative evaluations other than Type
A evaluations, a reinterpretation of the theory of ANOVA is necessary to establish a model for the certification of reference
materials that is widely applicable. For this, analysis of variance can be used as a statistical technique to derive standard
uncertainties from homogeneity, stability and characterisation data.
Received: 10 May 2000 / Accepted: 29 July 2000 相似文献
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从原料煤的均匀性、均匀性检验方法及判断标准、定值程序和定值方法、实验数据的统计处理、煤标准物质的稳定性等方面,介绍了研制动力煤标准物质的质量保证措施。 相似文献
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以电解铜和铜–铬、铜–锆中间合金为原材料,通过真空熔炼和热锻加工工艺,研制了铜–铬–锆合金光谱分析用标准物质。将样品分成4组,每组85块后,采用金相检验和光电直读光谱仪进行均匀性、稳定性和定值分析。从样品中随机抽取15块进行均匀性检验,经F检验表明,在95%的置信区间范围内样品均匀性良好;稳定性考察12个月,结果表明在考察期间内样品稳定性良好;标准物质样品经国内3家具有分析资质的实验室进行协作定值,并评定了定值结果的不确定。铜–铬–锆合金标准物质样品中Cr,Zr元素的相对扩展不确定度分别为0.015%~0.036%,0.019%~0.033%(k=2)。该标准物质达到了国家标准物质的技术要求,可用于有关铜–铬–锆合金产品中铬、锆元素的方法校准和质量控制。 相似文献