EPA Method 0050

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EPA Method 0050:

This method describes the collection of hydrogen chloride (HCl, CAS Registry Number 7647-01-0) and chlorine (Cl , CAS Registry Number 7782-50-5) in stack gas emission samples from 2 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). A midget impinger train sampling method designed for sampling sources of HCl/Cl emissions not in particulate form is presented in Method 2 0051. The method has potential for collection of all halogens and halogen acids, but has not yet been fully evaluated for that use.

Gaseous and particulate pollutants are withdrawn from an emission source and are collected in an optional cyclone, on a filter, and in absorbing solutions. The cyclone collects any liquid droplets and is not necessary if the source emissions do not contain liquid droplets. The Teflon mat or quartz-fiber filter collects other particulate matter including chloride salts. Acidic and alkaline absorbing solutions collect gaseous HCl and Cl , respectively. Following sampling of 2 emissions containing liquid droplets, any HCl/Cl dissolved in the liquid in the cyclone and/or on the 2 filter is vaporized to gas and ultimately collected in the impingers by pulling Ascarite IIR conditioned ambient air through the sampling train. In the acidified water absorbing solution, the HCl gas is solubilized and forms chloride (Cl-) ions. The Cl gas present in the emissions has a very low 2 solubility in acidified water and passes through to the alkaline absorbing solution where it undergoes hydrolysis to form a proton (H+), Cl-, and hypochlorous acid (HClO). The (Cl-) ions in the separate solutions are measured by ion chromatography (Method 9057). If desired, the particulate matter recovered from the filter and the probe is analyzed following the procedures in Method 5.