ASTM E1746-17a Sampling and Analysis of Liquid Chlorine for Gaseous impurities

ASTM E1746-17a Sampling and Analysis of Liquid Chlorine for Gaseous impurities

ASTM E1746-17a is the standard test method for the sampling and analysis of liquid chlorine for gaseous impurities.

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    Scope:

    This is a standard test method for sampling and analysis of liquid chlorine. ASTM E1746-17a describes a procedure for the determination of oxygen (200 to 400 μg/g), nitrogen (400 to 800 μg/g), and carbon (800 to 1000 ppm) content in liquid chlorine. 

    Test Procedure:

    A sample of liquid chlorine is trapped in a sampling tube and vaporized into a steel bomb as described in ASTM E1746-17a. It is very difficult to exclude sample contamination by ambient air during the process of sampling. The process of sampling of liquified gases for gaseous impurities includes additional problems. The vaporized chlorine in the steel bomb is introduced into a gas chromatograph by a gas sampling loop (1 cm3) using a ten-port gas sampling and switching valve. The separations are made on a Porapakt® Q column and on a 5A molecular sieve column whose lengths are such that the peaks do not overlap. 

    Specimen size:

    A gas sampling loop of 1cm3 is used for ASTM E1746-17a standard test method.

    Data: 

    Calculate the concentration of each component in the sample as follows:

    where,

    Ci = concentration, component i, μg/g (volume), Ai = peak area of component i in sample, μV-s, and Fi = area response factor for component i.

    Conclusion:

    ASTM E1746-17a covers the necessary procedures required for the sampling and analysis of liquid chlorine.

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