LC column recommendation

Which LC  column is recommended for fuel oils to determine dimer, trimer and tetramers , GPC  analysis?

Top Replies

  • Hi,

    Find above application guide of SEC/GPC analysis.

    Hope, it may help you..

  • Dear Tee,

    "fuel oils" is unfortunately a very generic description of a sample, same for "dimers, trimers, ...". The definition for fuel oil says, that it has a carbon number between 11 and 20, with a possible extension to 26 and is normally a mineral oil.

    Some questions need to be answered before there can be any kind of suggestion:

    • What kind of fuel oil do you mean? Mineral oil-based, biodiesel-like, etc.?
    • As for the oligomers: do you mean acid oligomers and if yes, what are the expected length of the side-chains.
    • Are the oligomers linked by in-chain-groups and what are the expected side chain-lengths?
    • I assume the sample is only soluble in some organic solvents?
    • What would be the estimated max. molecular weight? 
    • Does it need to be LC or could it also be GC?

    Please give us a little more insight into the analysis and the sample.

    Regards,

    Norbert

  • Thanks for taking the time out to look at my questions, if other answers are needed , I can forward them to the chemist.
    <![if !supportLists]>·   <![endif]>What kind of fuel oil do you mean? Mineral oil-based, biodiesel-like, etc.? Biodiesel
    <![if !supportLists]>·   <![endif]>As for the oligomers: do you mean acid oligomers and if yes, what are the expected length of the side-chains. Styrene oligomers with heavy aromatics
    <![if !supportLists]>·   <![endif]>Are the oligomers linked by in-chain-groups and what are the expected side chain-lengths?
    <![if !supportLists]>·   <![endif]>I assume the sample is only soluble in some organic solvents? Yes, currently THF
    <![if !supportLists]>·   <![endif]>What would be the estimated max. molecular weight?  9,000mw
    <![if !supportLists]>·   <![endif]>Does it need to be LC or could it also be GC? LC
     
     
  • Hi Tee,

    I discussed this with a GPC expert and we came out with an article that might help you: 1773 (researchgate.net)

    In this article 3 columns with different pore sizes are coupled to get the necessary resolution over a broad MW range.

    You can also use a set of PLgel 3 µm MIXED-E columns and here is an example for a polystyrene standard: 5990--7937EN_5989_5672.qxd (agilent.com). Keep in mind that you probably also need two or three columns in series to achieve a good resolution. You can find the part numbers of all these columns in the catalog above.

    Regards,

    Norbert

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