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    Home > Chemicals Industry > Chemical Technology > Determination of acrylonitrile content below 3mg/kg Headspace Gas Chromatography (Ammonia Phosphorus Detector) (1)

    Determination of acrylonitrile content below 3mg/kg Headspace Gas Chromatography (Ammonia Phosphorus Detector) (1)

    • Last Update: 2022-01-06
    • Source: Internet
    • Author: User
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    Due to its toxicity, the content of residual internal acrylonitrile monomer must be minimized in acrylonitrile polymer.


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    For reagent purity and safety precautions, see Chapter 4 of this standard


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    Equipped with a hot nitrogen detector, the injection port is heated or with an automatic gas phase sampling system


    The gas chromatography test conditions are:

    Chromatographic column: a stainless steel column with a length of 4m and an inner diameter of 2.


    Temperature of sampling plant: 140℃;

    Detector temperature: 140℃;

    Carrier gas: helium;

    The flow rate of the carrier gas: 1.


    Adjust the air flow rate (under 1.


    In order to optimize the signal of the thermionic detector, it should be operated strictly in accordance with the instructions of the instrument manufacturer.


    The recommended automatic sampling conditions are as follows:

    Injector temperature: 140℃;

    Incubator temperature: 70℃;

    Constant temperature cycle: 16h;

    Sampling time; 5s;

    Purge time: 30s;

    Reset interval; 30s;

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    3.
    3 Bottle cap sealer

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    3.
    4 Micro syringe: 0.
    1uL graduation, 10uL
    .

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    5 Gas syringe: 1mL (used for manual sampling).

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    3.
    6 Semi-microbalance: precision 0.
    01mg
    .

    Related Links: Determination of Residual Acrylonitrile Monomer Content in Styrene-Acrylonitrile Copolymer Gas Chromatography (2)

     

     

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