氮气中正丁醇标准气体的研制OA

To support the effective implementation of environmental odor monitoring method stan-dards,the 1-butanol certified reference material with a concentration of 60 μmol/mol in nitrogen was prepared using the weighing method.The purity analysis of high-purity raw materials was conducted.An analytical method based on gas chromatography was developed for sample analysis,and its preci-sion,detection limit,and linearity were systematically evaluated.Furthermore,the preparation technology for the 1-butanol certified reference material was established,the preparation repeatabili-ty and coated cylinder suitability were also investigated.The minimum operating pressure and validity period of the sample were determined through pressure release experiments and stability studies.Af-terwards,the uncertainty of the 1-butanol certified reference material was evaluated.Results showed that the analytical method exhibited excellent precision and linearity.The 1-butanol certified refer-ence material in nitrogen displayed high preparation repeatability.The coated cylinders were con-firmed to be suitable for preparing 1-butanol certified reference material in nitrogen.Pressure varia-tions within the range of 10 MPa to 2 MPa had no statistically significant effect on the characteristic values of 1-butanol.The characteristic values can remain stable throughout the 16-month validation period,confirming long-term stability.Overall,the relative expanded uncertainty(k=2)of 1-buta-nol certified reference material in nitrogen developed by weighing method was 2％.The certified val-ues are fully traceable to SI units through rigorous calibration protocols.The 1-butanol certified refer-ence material provides a reliable reference for enhancing the accuracy and comparability of odour monitoring and quality management in China's ambient air and industrial exhaust systems.