I need to make a 1 ppm gaseous standard of benzene in nitrogen gas within a Tedlar® gas sampling bag. Is this as simple as injecting 1 μL of neat benzene liquid into 1 L of nitrogen gas within the bag?

Or do I need to weigh out the benzene liquid and use a calculation including the molecular mass of benzene?

  • 2
    $\begingroup$ You need 1 microlitre of benzene vapor per 1 L of N2 at the same conditions as the used N2, if ppm(v/v) is assumed. Or recalculated V for different p or T. I suggest to use a kind of concentrated benzene vapor in N2 mixture and use this for final standard. $\endgroup$
    – Poutnik
    Mar 13, 2022 at 11:46
  • 1
    $\begingroup$ Here we go with ppm again $\endgroup$
    – andselisk
    Mar 13, 2022 at 11:54
  • $\begingroup$ Consider obtaining a crash course about gas laws and metrology basics or delegation of the task. $\endgroup$
    – Poutnik
    Mar 13, 2022 at 12:41


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