ASTM E806−08 Carbon Tetrachloride and Chloroform in Liquid Chlorine by Direct Injection (Gas Chromatographic Procedure)

ASTM E806−08 Carbon Tetrachloride and Chloroform in Liquid Chlorine by Direct Injection (Gas Chromatographic Procedure)

ASTM E806 – 08 determines the concentrations of carbon tetrachloride (CCl4) and chloroform (CHCl3) in liquid chlorine. The sample size and instrument are used to determine the lower limit of detection. The values expressed in SI units are considered standard.

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    Scope:

    Liquid chlorine may contain trace levels of CCl4 and CHCl3. When chlorine is used to purify water, these chemicals are transferred to the water. When the concentrations of CCl4 and CHCl3 in liquid chlorine are known, the maximum amounts of chlorine that can be added to the water may be approximated.

    Procedure

    Using a suitable syringe, a sample of liquid chlorine is injected into a gas chromatograph (GC) with a column capable of separating CCl4 and CHCl3 from Cl2 and other contaminants. The amount of CCl4 and CHCl3 in the sample is calculated by comparing the areas of the peaks obtained with the samples to the areas of peaks obtained with acceptable calibration standards under the same conditions.

    Specimen size

    Sample size and the instrument used; five ppm (w/w) is achievable. Measure the areas of the peaks for the CCl4 and CHCl3 and determine the μg/g of CCl4 and CHCl3 present in the sample.

    Data

                         V=W/Density

    Where V is the volume and W is the weight

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