Determination of Purity of DMT by the DSC Method and the Uncertainty Evaluation
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摘要: 通过定性和定量分析,研究了对苯二甲酸二甲酯(DMT)纯度物质的差示扫描量热法(DSC法)定值及其不确定度评定,并与已测定的质量平衡法的定值结果进行比对验证,确定DSC法对DMT纯度物质快速定值的可靠性。Abstract: Using qualitative and quantitative analyses, the differential scanning caloric (DSC) method for determining purity of DMT is introduced, with uncertainty evaluated. A measurement comparison with the mass balance (MB) method validated the results of the DSC method. The chemical composition of a DMT sample was determined by gas chromatography with tandem mass spectrometry and a fourier transform infrared spectrometer. The certified value was studied by the DSC method.
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Key words:
- DMT /
- purity certification /
- DSC method /
- uncertainty
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表 1 不同称样量的定值结果
Table 1. Determination results of different quantities
样品重量(mg) 定值结果(%) 0.8 99.78 1.0 99.66 1.5 99.71 2.0 99.72 5.0 99.62 表 2 DMT的定值结果
Table 2. Determination results of DMT
项目 DSC 定值(8次) 99.72% 99.66% 99.64% 99.85% 99.68% 99.60% 99.72% 99.88% 平均值 99.72% 标准偏差 0.10% 相对标准偏差 0.10% 定值结果 99.7% -
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