期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：267
期号：3
页码：1-8
DOI：10.1088/1755-1315/267/3/032087
出版社：IOP Publishing
摘要：In this experiment, a method for the determination of trace nitrogen trifluoride in helium (NF3/He) by gas chromatography (GC) was established. First, a series of NF3/He gas standard substance with accurate concentration was prepared by gravimetric method. And then, we had analyzed for the trace nitrogen and oxygen impurities in NF3, and the specific property experiment was used to verify that the impurity did not affect the measured value of the component. However, the analytical calibration curve of NF3 was nonlinear in the concentration range from 1 to 1000 μmol⋅mol−1. Nonlinear curves were transformed into linear curves by a linear power method, and the formula for the uncertainty of the fitting curve was calculated. Moreover, the consistency and uncertainty of the blind test results were evaluated. The results show that the method has high precision; the nitrogen or oxygen impurity has no effect on the specificity of the method; consistentcy of blind sample test result is well. Furthermore, it may be an ideal method for the research on the trace NF3 in helium.
