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purchased by manufacturers such as SKC Inc. <br /> . .°1 Considerations for Tediar Bag Sampling <br /> The following are some considerations for collecting a Tedlar bag sample. <br /> • Fill the Tedlar bag no more than 2/3 full: Allow for possible expansion due to an increase in <br /> temperature or decrease in atmospheric pressure (e.g., the cargo hold of a plane). <br /> • Keep the Tedlar bag out of sunlight: Tedlar film is transparent to ultraviolet light (although <br /> opaque versions are available) and the sample should be kept out of sunlight to avoid any <br /> photochemical reactions. <br /> • Protect the Tedlar bag: Store and ship the Tedlar bag samples in a protective box at room <br /> temperature. An ice chest can be used, but DO NOT CHILL. <br /> • Fill out the Tedlar bag label: It is much easier to write the sample information on the label <br /> before the Tedlar bag is inflated. <br /> • Provide a second Tedlar bag: Consider filling two bags per location in the rare occasion that a <br /> defective bag deflates before analysis. <br /> • Avoid Contamination: Care should be taken to avoid contamination introduced by the pump or <br /> tubing. Begin sampling at locations with the lowest compound concentrations (e.g., sample the <br /> SVE effluent before the influent). Decontaminate the pump between uses by purging with <br /> certified air for an extended period; better yet, use a lung sampler. Use shortest length possible of <br /> Teflon tubing or other inert tubing. Do not reuse tubing. If long lengths of tubing are used, <br /> consider purging the tubing with several volumes worth before sampling. If you are concerned <br /> about sampling for trace compounds, you shouldn't be using a Tedlar bag (see Section 1.2). <br /> • Don't Sample Dangerous Compounds in a Tedlar Bag: Do not ship any explosive substances, <br /> radiological or biological agents, corrosives, or extremely hazardous materials to Air Toxics Ltd. <br /> ALR'roxics LTD. <br /> 18 <br />