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    Home > Chemicals Industry > Chemical Technology > Nitromethane for industrial use (2)

    Nitromethane for industrial use (2)

    • Last Update: 2021-10-18
    • Source: Internet
    • Author: User
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    5 Test method

    5.


    Some test procedures specified by the test method may lead to dangerous situations


    5.


    Unless otherwise specified, only reagents confirmed to be analytically pure and grade 3 water specified in GB/T6682-1992 are used in the analysis


    The standard titration solution used in the analysis shall be prepared in accordance with the provisions of GB/T601-2002 when other requirements are not specified


    5.


    5.


    Using capillary column gas chromatography


    5.


    5.


    5.


    5.


    5.


    5.


    5.


    5.


    5.
    3.
    4 Chromatographic column and typical operating conditions

    The chromatographic column and chromatographic operating conditions recommended by this standard are shown in Table 2
    .
    Refer to Figure A.
    1 and Table A.
    1 in Appendix A for typical chromatograms and relative retention values ​​of each component
    .
    Other chromatographic columns and chromatographic operating conditions that can achieve the same degree of separation can also be used
    .

    The chromatographic column should be aged before first use
    .
    Under the condition of introducing carrier gas (N 2 ), the column temperature is 120°C, and the aging is 8h
    .

    Table 2 Recommended chromatographic column and chromatographic operating conditions

    5.
    3.
    5 Analysis steps

    According to the instrument manual, adjust the instrument to the operating conditions shown in Table 2, and start the measurement after the instrument is stable
    .
    According to the chromatographic bee area of ​​each component and its relative correction factor, the correction area normalization method is used for quantification
    .

    For the determination of the relative correction factor, refer to Appendix A, A.
    3
    .

    5.
    3.
    6 Result calculation

    The mass fraction w 1 of nitromethane , the value is expressed in %, calculated according to formula (1):

    Where:

    A 1 —the area of ​​the chromatographic peak of nitromethane;

    f 1 -the relative correction factor of nitromethane;

    A i —the area of ​​the chromatographic peak of component i;

    f i — relative correction factor of component i;

    w Water —The water content in mass fraction measured according to 5.
    6, expressed in (%)
    .

    Note: The value of the relative correction factor of the unknown component in the sample is 1
    .

    The calculation result is to two decimal places
    .

    Take the arithmetic mean of the two parallel determination results as the determination result
    .
    The absolute difference between the two parallel determination results is not more than 0.
    1%
    .

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