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M M TEST DESCRIPTION a.� 3.3.2 Particulate Matter Particulate emissions were measured according to SCAQMD Method 5.3, which includes in-stack filtration and analysis of condensible particulate matter. The method was modified for application to a test site with hydrogen chloride (HCl) in the stack gas. The method normally includes analysis of sulfuric acid mist from the filter, nozzle wash and impinger sample fractions. All sulfates including particulate acid mist and pseudo- particulate SO2 - derived sulfate species are then subtracted from the total particulate residue, and the results from a separate sulfuric acid mist sampling train are added back in. The method was designed originally for accurate measurements at oil refinery fluidized catalytic cracking units (FCCU). The method was used at Air Products because it is the only published method that properly handles the formation of ammonium sulfate "pseudo-particulate" from absorption of ammonia and sulfur dioxide in the impinger water. Method 5.3 does not include analysis for ammonium chloride, because FCCU sources generally have little or no HCl emission. The method was therefore modified for application to Air Products by adding the analysis of the chloride content of the impinger residue. The chloride was subtracted as ammonium chloride from the total impinger residue weight. No oche: modifications were made to Method 5.3. Table 3-5 presents a summary of the modified calculation procedure. 3.3.3 Sulfur Oxides The concentration of total sulfur oxides (SOJ was measured using SCAQMD Method 6.1, including the analysis for sulfuric acid mist, but modified to delete the sampling and analysis for free sulfur trioxide. The modification was made because the presence of ammonia in the stack gas would interfere with the analysis, and because the concentration of sulfur trioxide was expected to be a very small fraction of the total SO.,. The first impinger, which would normally include 80% isopropyl alcohol, was deleted from the sampling train, as the ammonia in the stack gas would interfere with the analysis of that S03 fraction of the sample, and with the analysis of S02. Any small amount of sulfur trioxide was therefore included in the total SO, result. The samples were analyzed for sulfate by titration with barium chloride to a thorin xylene cyanole indicator end point. Prior to titration, the samples were passed through an ion exchange resin to remove interfering cations and to convert dissolved NH3, which interferes with the titration, to NE,', which does not interfere. Results are reported as total SO., computed as SO,. 302108/R143B179.N -L-! M140T