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介绍了影响微量一氧化碳气体标准物质定值的因素,包括定值方法的选取、原料气的选择、纯度检验和称量的方法。分别采用气相色谱仪的FID和PD—HID检测器对标准物质进行检测,确立了该标准物质的分析方法。对称量法制备微量一氧化碳气体标准物质过程中影响测量不确定度的因素进行了分析,评定了标准物质的不确定度。 相似文献
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依据ISO 6142和GB/T 5274标准,采用称量法制备1 μmol/mol的氮中微量氧气体标准物质.使用钢瓶清洗系统和配气系统,通过超纯气体纯化器对高纯氮中的氧杂质进行脱除,使纯化后氧含量小于3 nmol/mol.同时平行配制模拟气,确保空气中的氧对所制备的标准物质污染最小.用微量氧分析仪考察标准物质随贮存时间和压力变化的稳定性,并通过比对验证了标准物质的定值结果和不确定度,证明了该制备方法可行,定值准确可靠.气体标准物质定值扩展不确定度为2%,有效期限为12个月. 相似文献
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以氮中二氧化碳二级气体标准物质的研制为例,探讨采用比较法研制二级气体标准物质及其不确定度的分析计算,其中标准物质的制备采用称量法配制,并对所研制的样品进行了均匀性、稳定性试验,结果表明,所研制的氮中二氧化碳气体的标准物质在一年的考察期内,其均匀性、稳定性、量值不确定度均达到国家二级标准物质要求,符合申报条件。 相似文献
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This method, which employs an internal standard, is both easy to use and accurate. The required weight fraction of a phase in the mixture to be analysed is determined from the ratio of slopes of two linear plots passing through their respective origins, designated as the analysis and reference lines. The analysis line is obtained by plotting the intensity ratio of the required phase to the standard against the weight ratio of the mixture to the standard, for different proportions of mixture and standard. The reference line for the required phase is obtained by plotting the intensity ratio against the weight ratio of the reference material to the standard, using a pure phase or a reference material of known composition. The ease of use comes when weighing out the samples to be X-rayed. The weight of the mixture to be analysed, the reference material and the internal standard need not be any specific values or in any fixed proportions but, of course, require to be determined precisely. The weight ratios can be chosen so that peak intensities can be measured accurately. Precise weighing and the ability to use various weight ratios can give this method greater accuracy than that of the conventional internal standard method. 相似文献
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介绍了氮中丙烷标准样品称量制备的原理和过程,并对可能引发氮中丙烷定值的不确定度进行了误差分析。并结合气相色谱法对其稳定性和均匀性等进行考察,通过数据分析等显示所制备的氮中丙烷数据量值准确可靠,能达到预期标准。 相似文献
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论述了氦中氙、六氟化硫气体标准物质的制备方法、稳定性参考值、不确定度计算方法,证明达到国家二级气体标准物质要求。该研制方法可行,最值准确可靠。 相似文献
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论述了氦中氪、四氟化碳气体标准物质的制备方法、稳定性参考值、不确定度计算,证明达到国家二级气体标准物质要求。研制方法可行,量值准确可靠。 相似文献
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论述了氩中氢、甲烷气体标准物质的制备方法、稳定性参考值、不确定度计算,证明达到国家二级气体标准物质要求。研制方法可行,量值准确可靠。 相似文献
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论述了氩中氖气体标准物质的制备方法、稳定性参考值、不确定度计算,证明达到国家二级气体标准物质要求.该制备方法可行,量值准确可靠. 相似文献