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eurofins • • <br /> Air Toxics <br /> LABORATORY NARRATIVE <br /> Modified ASTM D-1946 <br /> Brusca Associates, Inc. <br /> Workorder# 1801408B <br /> Two 1 Liter Summa Canister samples were received on January 26, 2018. The laboratory performed <br /> analysis via Modified ASTM Method D-1946 for Methane and fixed gases in air using GC/FID or <br /> GC/TCD. The method involves direct injection of 1.0 mL of sample. <br /> On the analytical column employed for this analysis, Oxygen coelutes with Argon. The corresponding <br /> peak is quantitated as Oxygen. <br /> Since Nitrogen is used to pressurize samples, the reported Nitrogen values are calculated by adding all <br /> the sample components and subtracting from 100%. <br /> Method modifications taken to run these samples are summarized in the table below. Specific project <br /> requirements may over-ride the ATL modifications. <br /> Requirement ASTMD-1946 ATL Modifications <br /> Calibration A single point A minimum of 5-point calibration curve is performed. <br /> calibration is Quantitation is based on average Response Factor. <br /> performed using a <br /> reference standard <br /> closely matching the <br /> composition of the <br /> unknown. <br /> Reference Standard The composition of any The standards used by ATL are blended to a>/=95% <br /> reference standard accuracy. <br /> must be known to <br /> within 0.01 mol%for <br /> any component. <br /> Sample Injection Volume Components whose The sample container is connected directly to a fixed <br /> concentrations are in volume sample loop of 1.0 mL on the GC. Linear range <br /> excess of 5 %should is defined by the calibration curve. Bags are loaded by <br /> not be analyzed by vacuum. <br /> using sample volumes <br /> greater than 0.5 mL. <br /> Normalization Normalize the mole Results are not normalized. The sum of the reported <br /> percent values by values can differ from 100%by as much as 15%,either <br /> multiplying each value due to analytical variability or an unusual sample matrix. <br /> by 100 and dividing by <br /> the sum of the original <br /> values.The sum of the <br /> original values should <br /> not differ from 100% <br /> by more than 1.0%. <br /> Precision Precision requirements Duplicates should agree within 25%RPD for detections <br /> established at each > 5 X's the RL. <br /> concentration level. <br /> Page 3 of 10 <br />