共查询到20条相似文献,搜索用时 477 毫秒
1.
2.
3.
对吹扫捕集-气质法测定海水水质中甲苯含量的不确定度进行评定。分析不确定度的主要来源,包括测量重复性、标准溶液配制、定容体积和检测设备引入的不确定度。分别计算了各分量的不确定度,再计算出合成标准不确定度和扩展不确定度。[1]结果表明,吹扫捕集-气质法测定海水水质中甲苯含量的扩展不确定度为0.3μg/L(k=2)。 相似文献
4.
5.
本文简单介绍了GUM和MCM不确定度评定的基本原理,以牛血清白蛋白溶液配制为例,分别采用GUM和MCM方法对化学计量中常用的重量—容量法溶液配制结果的不确定度进行了评定.GUM法得到的溶液浓度配制结果为( 16.90 +0.66) g/L,MCM法得到的溶液浓度配制结果为(16.90+0.65)g/L,两者基本一致.其中牛血清白蛋白标准物质引入的不确定度为主要的不确定度分量,对总不确定度的贡献超过了98%,在这种各个不确定度分量大小不相近的情况下,更适合采用MCM法进行不确定度评价. 相似文献
6.
7.
8.
通过对高效液相色谱法测定葡萄酒中合成色素苋菜红质量浓度的全过程分析,确定了测定结果不确定度的来源。采用计量学不确定度传递模型,对引入的不确定度分量进行评定,确定了葡萄酒中苋菜红质量浓度标准不确定度由标准物质、标准溶液配制、标准曲线拟合、样品制备、测量重复性和回收率等6部分不确定度合成得到。2个不同质量浓度样品测定结果不确定度被评定,其相对扩展不确定度分别为2.6%和2.2%(k=2),由不确定度评价结果分析得到,样品重复性测定和标准溶液配制是测定结果不确定度的主要来源。 相似文献
9.
按照SN/T 2226-2008进出口动物源性食品中乌洛托品残留量的检测方法标准方法对鸡肉中乌洛托品残留量进行分析。通过建立数学模型,对测量结果的各不确定度来源,如标准溶液的配制、线性回归方程、测试过程的随机效应等引入的不确定度分量进行分析和量化。根据分析结果,当鸡肉中乌洛托品含量为8.78μg/kg时,扩展不确定度为0.41μg/kg(k=2)。 相似文献
10.
11.
针对水分检测领域对标准物质的需要,研制了系列水分标准物质,包括4种液体水分标准物质,量值覆盖范围为0.139~47.6 mg/g,不确定度范围为0.012~1.1 mg/g;还包括3种含结晶水化合物水分标准物质,量值覆盖范围为50.7~156.3 mg/g,不确定度范围为0.6~1.3 mg/g,以及3种混合物水分标准物质,量值覆盖范围为0.142~9.90 mg/g,不确定度范围为0.013~0.20 mg/g。该系列液体和固体水分标准物质,适用于卡尔·费休库仑法和容量法水分仪的校准和检定,以及水分测量方法的验证,能够保障我国水分检测的量值准确和等效一致。 相似文献
12.
Certified reference materials are essential tools for calibration of measuring instruments, validation of analytical methods and assuring quality of measurement results. However, in the case of water content in honey, which is used to determine the quality and the marketability of honey, there is a lack of matrix reference materials. Certified reference material for water content in honey has been developed by the National Institute of Standards, Egypt. This article describes production of the material from processing to value assignment. Characterization of the material was carried out by refractometric and Karl Fisher titration procedures, where homogeneity and stability studies were carried out by Karl Fisher titration method. The measurement results were statistically analysed and weighted mean was calculated as assigned value. The certified value and expanded uncertainty were found 16.24 ± 0.33 g/100 g, respectively. 相似文献
13.
14.
A. Baldan R. Bosma A. Peruzzi A. M. H. van der Veen Y. Shimizu 《International Journal of Thermophysics》2009,30(1):325-333
The certification of high-purity liquid reference materials is supported by several analytical techniques (e.g., gas chromatography,
liquid chromatography, Karl Fischer coulometry, inductively coupled plasma mass spectrometry, differential scanning calorimetry,
adiabatic calorimetry). Most of them provide information on a limited set of specific impurities present in the sample (indirect
methods). Adiabatic calorimetry [1] complementarily provides the overall molar fraction of impurities with sensitivity down
to few μmol · mol−1 without giving any information about the nature of the impurities present in the sample (direct method). As the combination
of adiabatic calorimetry with one (or more than one) indirect chemical techniques was regarded as an optimal methodology,
NMi VSL developed an adiabatic calorimetry facility for the purity determination of high-purity liquid reference materials
[2]. Within the framework of collaboration with NMIJ, a benzene-certified reference material (NMIJ CRM 4002) from NMIJ was
analyzed by adiabatic calorimetry at NMi VSL. The results of this measurement are reported in this paper. Good agreement with
the NMIJ-certified purity value (99.992 ± 0.003) cmol · mol−1 was found. The influence of different data analysis approaches (e.g., extrapolation functions, melting ranges) on the measurement
results is reported. The uncertainty of the measured purity was estimated. 相似文献
15.
采用超高效液相色谱-串联质谱法(UPLC-MS/MS)测定了化妆品中丙烯酰胺含量,并对其进行了不确定度评定。根据 JJF 1059.1-2012《测量不确定度评定与表示》 建立测定化妆品中丙烯酰胺含量的计量学数学模型,分析和量化各不确定度分量。采用该方法检测的化妆品中丙烯酰胺的合成不确定度为0.033mg/kg,扩展不确定度为0.066mg/kg。实验测定的化妆品中丙烯酰胺含量结果为(0.502±0.066)mg/kg(k=2,置信概率P=95%)。评定结果表明,实验的不确定度主要由标准溶液配制和标准曲线拟合引入。 相似文献
16.
17.
18.
19.
20.
三元共聚高吸水性树脂的合成及研究 总被引:20,自引:1,他引:19
采用水溶性引发剂,以环氧氯丙烷为交联剂,用淀粉、部分中和的丙烯酸(钠)、丙烯酰胺为原料,用分步法进行交联接枝共聚,通过系统实验,选择最佳配比,制得吸无离子水3000(g/g),吸0.9%NaCl水溶液140(g/g)的高吸水性树脂。讨论了引发剂、交联剂、丙烯酰胺用量等合成条件与吸水性的关系。 相似文献