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APT Project CMX2453 Test Report, Kiln Stack Emissions (March 24, 2003} Prior to sampling, the first three impingers contained 200, 100 and 100 milliliters, respectively, of 2,4-dintrophenyl hydrazine (2,4-DNPH) solution. The fourth impinger contained approximately 250 grams of dried silica gel. Following each sampling period, the contents of the first three impingers, along with a series of water and methylene chloride rinses of the sampling probe, nozzle and impingers, were recovered for subsequent HPLC analysis for the dinitrophenylhydrazone aldehyde derivatives to determine the formaldehyde and acetaldehyde content of the stack gas. The laboratory data were combined with field data to calculate the HCHO and CHaCHO emissions in units of ppmvd and Ib/hr. As these runs were conducted simultaneously with the EPA Method 26A sample runs, the diluent (oxygen and carbon dioxide) data remains the same. 5.4.1. Supplemental QA/OC Procedures - Aldehydes As required by the method, a sample of unexposed impinger solution was analyzed along with the emission samples, along with a field audit sample which consisted of a known formaldehyde mass spiked into a bottle containing 2,4-DNPH reagent. Additionally, a true sample train blank was collected and analyzed concun'ent with the emissions samples. Field blank collection procedures were identical to those detailed in Section 5.1.1 for PM / Metals. 5.5. Trace Hydrocarbons Trace hydrocarbon emission levels were determined in accordance with Method TO-14. Each sampling period consisted of collection of approximately six (6) liters of stack gas in an evacuated, SUMMA-polished, stainless steel canister. The gas passed through an in- stackglass probe, through a short section of Teflon sample line, through aflow-controlling orifice, and into the canister. Stack gas was collected from a single point located approximately one meter in from the stack wall. Following each sampling period, the canister was disconnected from the sampling probe and shipped to Air Toxics for GC/MS analysis for the TO-14 target analytes. Detected compounds were reported in units of Ib/hr. page 18