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5ISO 6144-1998, Gas analysis : Preparation of calibration gas mixture-static volumetric method [S] .
6ISO 6145-1998, Gas analysis: Preparation of calibration gas mixture-dynamic volumetric method [S].
7PITOMBOL R M, CARDOSO A A. Standard gas mixture production based on the diffusion method [J] . Intern J Environ Anal Chem, 1990, 39 : 349-360.