Development of benzene, toluene, ethylbenzene and xylenes certified gaseous reference materials

8th Brazilian Congress on Metrology

Brum, M.C.^1 ; Sobrinho, D.C.G.^1 ; Fagundes, F.A.^1 ; Oudwater, R.J.^1 ; Augusto, C.R.^1

Divisão de Metrologia Química (Dquim), Instituto Nacional de Metrologia, Qualidade e Tecnologia, (Inmetro), Xerém

RJ

25250-020, Brazil^1

关键词: Cylinder surface;    Long-term stability test;    Reference material;    Uncertainty sources;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/733/1/012035/pdf
DOI  :  10.1088/1742-6596/733/1/012035

来源: IOP

【 摘 要 】

The work describes the production of certified gaseous reference materials of benzene, toluene, ethylbenzene and xylenes (BTEX) in nitrogen from the gravimetric production up to the long term stability tests followed by the certifying step. The uncertainty in the amount fractions of the compounds in these mixtures was approximately 4% (relative) for the range studied from 2 to 16 μmol/mol. Also the adsorption of the BTEX on the cylinder surface and the tubing were investigated as potential uncertainty source.