Laserfiche WebLink
tiff• eurofins <br />Air TOXICS <br />LABORATORY NARRATIVE <br />Modified ASTM D-1946 <br />Brusca Associates, Inc. <br />Workorderp 1812339B <br />Two 1 Liter Summa Canister samples were received on December 17, 2018. The laboratory <br />performed analysis via Modified ASTM Method D-1946 for Methane and fixed gases in air using <br />GC/FID or 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 />Regubernent <br />ASYND-1946 <br />ATL ModlJ7eadow <br />Calibration <br />A single point <br />A minimum of 5 -point calibration awe is performed <br />calibration is performed <br />Quantitation is based on average Response Factor. <br />using a reference <br />standard closely <br />matching the <br />composition of the <br />unknown. <br />Reference Standard <br />The composition of any <br />The standards used by ATL are blended to a>/= 95% <br />mfereme standard most <br />accuracy. <br />be known to within <br />0.01 mol % for my <br />component. <br />Sample injection Volume <br />Components whose <br />The sample container is connected directly to a feed <br />concentrations are in <br />volume sample loop of 1.0 mL on the GSC. Linear range is <br />excess of 5 % should <br />defined by the calibration curve. Baga are loaded by <br />not be analyzed by <br />vacuum. <br />Using sample volumes <br />great -than 0.5 mL. <br />Normalization <br />Normalize the mole <br />Results are not normalized. The sum of the reported <br />percent values by <br />values can differ from 100% by as much as 15%, either <br />multiplying each value <br />due to analytical variability or an unusual sample matrix. <br />by 100 and dividing by <br />the amu 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 <br />Precision requirements <br />Duplicates should agree within 25% RPD for detections> <br />established at each <br />5 I the RL. <br />concentration level. <br />Page 3 of 10 <br />