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I'm translating a Certificate of Suitability that very briefly describes procedures used to measure several impurities in a drug substance. There is a short description of the parameters of a Gas Chromatography-MS/MS procedure to detect an impurity called NDBA.

I don't understand the final line here:

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What is the meaning of Resolution and especially of Unit? I can get by with "resolution" by simply translating it into Russian without knowing what it means, but there is no suitable Russian word to translate "Unit" - I must use either the Russian words for "Unit operation" or for "Equipment unit" or for "Measurement unit", and I have no idea what this Unit means in the original text.

I tried reading up on MS/MS but I haven't understood it well enough to guess the meaning of this line.

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    $\begingroup$ Can you ask the source who provided the method? Looks like their internal jargon. There is something unit resolution but not sure what unit means. $\endgroup$
    – ACR
    Commented Jul 11, 2020 at 4:08
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    $\begingroup$ @M.Farooq - I'll try but I doubt that I'll get any answer, because I now work not for a single company but for a translation bureau, which gets each document from a different client, and the client may be quite distant from the original authors of the document. I'll just mark this as "impossible to translate". $\endgroup$ Commented Jul 11, 2020 at 4:17
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    $\begingroup$ @CowperKetlle, I think most probably it is equipment unit. It does not make sense in English either. $\endgroup$
    – ACR
    Commented Jul 11, 2020 at 4:21

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The term "unit" probably means the size of the isolation window used in the QQQ. The term "unit" means the nominal isolation window is 1 Da (i.e. one mass "unit") wide.

The "resolution" is a standard term in mass spectrometry, and here they are saying it is about 1 Da.

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