Method 0050/9057

Isokinetic HCl/Cl2 Emission Sampling and Analysis

This method describes the collection of hydrogen chloride (HCl) and chlorine (Cl2) in stack gas emission samples from hazardous waste incinerators and municipal waste combustors. The collected samples are analyzed using Method 9057. This method collects the emission sample isokinetically and is therefore particularly suited for sampling at sources, such as those controlled by wet scrubbers, emitting acid particulate matter (e.g., HCl dissolved in water droplets).  It is noted that this method is not to be used for demonstrating compliance with HCl emission standards less than 20ppm.

The method has potential for collection of all halogens and halogen acids, but has not yet been fully evaluated for that use. For analytical determination of additional halides, Method 9056 is used, rather than Method 9057. This method is similar to EPA Methods 26 and 26A.

Samples are collected isokinetically using a modified Method 5 train consisting of a Teflon mat or quartz filter and a series of impingers.   The 1st impinger (also called the Knockout iminger) is filled with 50mL of 0.05M H2SO4,  2nd and 3rd impingers are filled with 100mL 0.05M H2SO4 solution.  The 4th and 5th impingers are filled with 100mL of 0.1M NaOH.  The 6th impinger is filled with 200-300g of silica gel.


After collection, the contents of all impingers are measured to later assist with the determination of stack moisture.  The contents of the silica gel impinger are weighed for weight gain to also use in the determination of stack moistures.  This method also allows for the determination of particulate matter (PM). If PM is being determined the filter and front half rinse must be collected. The filter is folded such that the particulate is on the inside on the filter and placed in a petri dish.  The front half of the train (probe, nozzle and front half of the filter holder) is rinsed with acetone.  This is collected and analyzed for PM.


The contents of the Knockout impinger and two H2SO4 impingers are combined into one container along with the water rinses of the impingers.  The contents of the two NaOH impingers are combined into one container along with the water rinses of the impingers.  Each fraction of the train is analyzed separately.  Typically, the halogen acids (HCl, HBr, HF) are determined from the H2SO4 impingers and the halogens (Br2, Cl2) from the NaOH impingers.


Per Method 9057, each sample is analyzed in duplicate.




(EPA SW-846)


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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   30 days from sampling to analysis
Preservatives:   2mL of 0.5M sodium thiosulfate to the NaOH impingers
Required Preps:   Teflon mat or quartz fiber filter
Collection Method:   Modified Method 5 train following SW-846 0050 procedures.
Analytical Methodology:   Ion chromatography by SW-846 9057
Documentation:   0050

Analyte List*

Analyte Formula CAS Number Detection Limit
Hydrogen chloride

* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.