Laserfiche WebLink
Table 1.2. Comparison of Canisters to Te lar Bags <br /> Canisters Tedlar Bags_ <br /> Common Volumes I and 6 L_._� 1, 3, and 5 L <br /> Type of Sampling Passive (vacuum) _ Active (pump required) <br /> Sample Handling Room temperature Room temperature <br /> Media Hold Time Up to 30 days recommended Indefinite <br /> a <br /> Hold Time to Analysis 14-30 days 3 days <br /> Surface Inertness Excellent Fair <br /> Cleanliness 10% or 100% Some VOCs present <br /> certified to ppbv/pptv levels at 0.5 to 45 ppbv <br /> Sampling Application Ambient/indoor air, soil/landfill Ambient air (fixed gases <br /> gas, stationary source only), soil/landfill gas, <br /> stationary source <br /> Rule of Thumb "ppbv device' "ppmv device" <br /> Advantages Inertness, hold time, Purchase/shipping cost, <br /> ruggedness, no pump availability, convenience <br /> AIR TOXICS LTD. <br /> 3 <br />