共查询到19条相似文献,搜索用时 93 毫秒
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本文根据NY/T 1104-2006《氢化物发生原子荧光光谱法》对土壤中的全硒进行了测定,参照JJF1059.1-2012《测量不确定度评定与表示》和《实用测量不确定度评定》,从实验的各个过程对不确定的来源进行了分析,并对已知的来源进行了评定和分析。结果表明,测量土壤中全硒的不确定来源主要是标准曲线拟合过程中所引入的不确定度,其次是标准系列的配制过程中所引入的不确定。该评定方法为氢化物发生原子荧光光谱法测定土壤中重金属元素的不确定的评定提供了一定的参考依据。 相似文献
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为确定气相色谱法测定四氧化二氮(N2O4)、绿色四氧化二氮(MON)中相当水含量的不确定度,按照GJB1964—1994、GJB1673—1993中规定的色谱法测量相当水含量的方法,用SC-200气相色谱仪测定N2O4相当水含量,应用测定数据进行标准不确定度、合成不确定度、扩展不确定度的分析和评定。合成标准不确定度为0.0327%,扩展不确定度为0.065%(包含因子k=2)。 相似文献
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马尾松松节油标准样品的定值研究 总被引:2,自引:0,他引:2
研究了马尾松松节油标准样品的均匀性、稳定性及其定值方法。马尾松松节油标准样品中4种指标成分的含量测定采用气相色谱面积归一化法。制备得到的马尾松松节油标准样品通过了均匀性检验,且在36个月内是稳定的。马尾松松节油标准样品的多实验室联合定值结果为:α-蒎烯含量的标准值84.63%,标准不确定度0.12%,扩展不确定度(95%置信率)0.24%;β-蒎烯含量的标准值9.56%,标准不确定度0.07%,扩展不确定度(95%置信率)0.14%;苧烯含量的标准值1.66%,标准不确定度0.03%,扩展不确定度(95%置信率)0.06%;长叶烯含量的标准值0.43%,标准不确定度0.04%,扩展不确定度(95%置信率)0.08%。 相似文献
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分光光度法快速测定复合肥中有效磷含量的测量不确定度评定 总被引:1,自引:0,他引:1
分析了分光光度法快速测定复合肥中有效磷含量的测量不确定度的主要来源,对各不确定度分量进行了评定,求得合成标准不确定度和扩展不确定度分别为0.21%和0.42%。不确定度分析与评定结果表明:影响分光光度法快速测定复合肥中有效磷含量的测量不确定度的主要因素是标准工作曲线拟合引入的不确定度,加强这方面的控制可提高测量结果的准确性。 相似文献
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This article aims to improve uncertainty evaluation of process models by combining a quantitative uncertainty evaluation method (data validation) with a qualitative uncertainty evaluation method (pedigree analysis). The approach is tested on a case study of monoethanolamine based postcombustion CO2 capture from a coal power plant. Data validation was used to quantitatively assess the uncertainty of the inputs and outputs of the MEA model. Pedigree analysis was used to qualitatively assess the uncertainty in the current knowledge base on MEA carbon capture systems, the uncertainty in the MEA process model, and the uncertainty of the MEA model results. The pedigree review was done by 13 international experts in the field of postcombustion carbon capture with chemical solvents.The data validation showed that our MEA model is accurate in predicting specific reboiler duty, and CO2 stream purity (4% and 1% difference respectively between model and pilot plant results), but in first instance it was less accurate in predicting liquid over gas ratio, and cooling water requirement (54% and 23% difference respectively between model and pilot plant results). The pedigree analysis complemented these results by showing that there was fairly high uncertainty in the thermodynamic, and chemistry submodels, as reflected in the low pedigree scores on most indicators. Therefore, the model was improved to better resemble pilot plant results.The results indicate that using a pedigree approach improved uncertainty evaluation in three ways. First, by highlighting sources of uncertainty that quantitative uncertainty analysis does not take into account, such as uncertainty in the knowledge base regarding a specific phenomenon. Second, by providing a systematic approach to uncertainty evaluation, thereby increasing the awareness of modeller and model user. And finally, by presenting the outcomes in easy to understand numerical scores and colours, improving the communication of model uncertainty. In combination with quantitative validation efforts, the pedigree approach can provide a strong method to gain deep insight into the strengths and weaknesses of a process model, and to communicate this to policy and decision-makers. 相似文献
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对火焰原子吸收光谱法测定硫铁矿和硫精矿中锌含量的不确定度进行了评定。分析了测量不确定度的来源,如试样称量,标准溶液制备,标准曲线绘制和测量重复性,对各不确定度分量进行了评定。当铅含量为0.038%时,测量结果的扩展不确定度为0.002%。 相似文献
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对衣料用液体洗涤剂中总活性物的不确定度来源进行了详细的分析和测定过程中的主要不确定度分量进行了合理评定,包括样品质量称量引入的不确定度;称量乙醇溶解物质量引入的不确定度;硝酸银标准溶液的标准浓度引入的不确定度;数字滴定器引入的不确定度以及测量的重复性所引入的不确定度,最后合成标准不确定度乘以95%置信概率下的扩展因子k=2获得测量结果的不确定度。 相似文献
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