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制备了一套适用于X射线荧光光谱法测定聚丙烯(PP)材料中5种有害元素(铅、镉、铬、汞和溴)的标准样品。首先,制备聚丙烯材料目标元素高含量母粒,然后通过逐级稀释的方法制备目标元素含量梯度的样品原料,最后制得符合X射线荧光光谱分析使用要求的标准样品。采用电感耦合等离子体原子发射光谱法和离子色谱法测定所制得标准样品中各元素的含量。所制备的用于X射线荧光光谱分析的PP标准样品通过F检验和t检验,得到统计量F相似文献
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<正>[ISO Guide 35-20171]中要求均匀性应包括"使用材料均匀性的初次证据(包括初次试验证据),对标准样品候选材料开展均匀性试验研究,或两者都包括"。块状标准样品的初检过程是对块状标准样品候选物均匀性的确认过程,是对研制周期长,过程复杂的标准样品所做的初步评判。块状标准样品具有不可破碎混匀、研发周期长等特点,因此,当候 相似文献
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标准样品的均匀性检验及判断 总被引:1,自引:0,他引:1
对标准样品的均匀性检验及判断进行了系统的论述。介绍了标准样品的均匀性检验及判断的各种方法,指出标准样品的均匀性要通过综合评估多方位去判断。 相似文献
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水平测试样品的均匀性保证 总被引:1,自引:0,他引:1
为确保水平测试样品的均匀性,文中阐述了水平测试、样品制备、均匀性检验的取样数量、取样方式、最小取样量、测量方法和统计方法,重点介绍了均匀性检验的统计方法。 相似文献
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标准物质均匀性检验和统计方法研究 总被引:4,自引:0,他引:4
本文讨论了标准物质均匀性检验的实验方案、测试顺序、统计方法对均性均检验结果的影响。提出了测试方法精密度参数进行均匀性检验的统计方法和单元内单次测定的实验方案,弥补了常用方差分析等统计方法的不足。 相似文献
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介绍铝合金化学成分标准物质的研制过程。采用中频感应电炉熔炼法制备了铝合金化学成分标准物质候选物,并对标准物质候选物的均匀性和稳定性进行了考察。选择6家具有资质的实验室对研制的标准物质中各化学成分进行协作定值,并对各元素定值的不确定度进行评定。结果表明,在95%的置信区间内标准物质均匀性良好,经过13个月稳定性考察试验,标准物质稳定性良好。Si,Fe,Cu,Mn,Mg,Ti,Cd,V,Zr,B,Sn,Zn的定值结果分别为0.013 8%,0.012 5%,2.868%,0.185%,0.014 0%,0.082 8%,0.041 7%,0.032 9%,0.031 4%,0.003 8%,0.003 4%,0.025 6%,定值结果的相对扩展不确定度为1.4%~9.0%(k=2)。研制的标准物质达到相关技术要求,可用于该类铝合金材料的质量控制。 相似文献
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Patricia Navarro Luis Bartolomé Juan Carlos Raposo Olatz Zuloaga Gorka Arana Nestor Etxebarria 《Analytica chimica acta》2010,675(1):91-96
Due to high cost of certified reference materials (CRMs), reference materials (RMs) are preferred to check the method performance in environmental analysis. In this work, a laboratory reference material (LRM) was prepared and characterised to carry out the quality control in monitoring analysis of eight polycyclic aromatic hydrocarbons (PAHs) and nine trace metals in mussel tissue. Mussels were collected in a naturally polluted area. Before the reference material was bottled, the mussel tissue was stabilised by freeze-drying, ground and sieved. For the material characterisation, several statistical tests were applied to check the homogeneity of the analytes in the tissue, and a stability test was performed to study the effect of the storage temperature in the analyte concentration. Other characteristics such as specific density, moisture and lipid contents as well as particle size distribution of the material were determined. Although the LRM had a homogeneous distribution for all PAHs and almost all metals, the stability study showed different results at both storage temperatures studied. For both PAHs and trace metals, the material was suitable to assure the quality control of the analysis. 相似文献
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Maria Belli 《Accreditation and quality assurance》2009,14(8-9):421-426
Current standards and international guides on PTs/EQAs consider the achievement of the quality and reliability of PT test items as important steps. Similarity to the materials routinely analysed and sufficient homogeneity and stability of the properties of interest are the main quality characteristics required. PT test items are carriers of the property values used as reference to evaluate laboratory performances. Requirements for PT test items are practically the same as those given for reference materials. ISO-REMCO defines reference material as “Material, sufficiently homogeneous and stable with respect to one or more specified properties, which has been established to be, fit for its intended use in a measurement processes”. In the case of PT test items, they should have a degree of homogeneity and stability to be fit for the purpose of identifying deviations among laboratories. This paper reports some remarks on the main characteristics of PT test items, using ISPRA experience as RM producer. 相似文献
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Chemical homogeneity is a relative property of solid-state materials; it depends not only on their ultimate purposes, but also on the parameters of the analytical procedure applied in the investigation. These features are often given inadequate attention in the characterization of solid materials. A statistical model for representative sampling is used here as the starting point to derive relationships which demonstrate quantitatively the increasing rigour of the homogeneity test with increasing spatial resolution and precision of the analytical procedure. It is also shown that chemical homogeneity can be confirmed at a calculated risk, when the tests do not show the material to be significantly inhomogeneous and when maximum permissible deviations in concentration can be given for a practical application. 相似文献