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2 . 2 METHOD <br /> INSTRUCTIONSSAMPLING <br /> I <br /> i <br /> EPA Method TO-17 <br /> Determination of Volatile Organic Compounds in A nbient Air using Active Sampling <br /> Onto Sorbent Tubes. <br /> http://www.ep-a.Roy/ttn/,amtic/­­files/ambient/airtoto-17r. df <br /> This method replaces earlier sorbent-based EPA Methods TO-1 and TO-2 and provides <br /> an alternative to canister-based EPA Method TO-15 The target compound list is the <br /> same as TO-15 (i.e., subsets of the 97 VOCs listed as hazardous air pollutants in the <br /> Clean Air Act Amendments of 1990). However,TC-17 can collect VOCs over a wider <br /> volatility range than TO-15,by using a tube with m tiple sorbents packed in increasing <br /> sorb_ent strength. Both single and multi-bed sorbent tubes are described in TO-17. Tube <br /> Style 3(i.e,, Carbotxap 300 by Supelco) can be used for compounds ranging inT volatility# <br /> fromn-C3 to n-C,6 for air volumes of 2 L at relative humidity below 65% and <br /> temperatures below 30°C.Volumes greater than 5 L can be collected,but C3 compounds <br /> are not quantitatively retained. Single bed tubes,such as Tenax TA,can be used to <br /> effectively collect Naphthalene and middle distillate Fuels in indoor air. <br /> Waft <br /> BEET=r �ky Lmafflm <br /> Media Sorbent tube (e.g.,Carbo rap 300)with optional particulate <br /> filter and ozone scrubber <br /> Type of Pump Low flow rate pump (10 to 200 mL/min) or high flow pump <br /> with low flow adapter <br /> Sampling Rate and 17 and 67 mL/min for 1 hour (example flow rates) <br /> Interval e .... . .: <br /> Sampling Volume 1 and 4 L (example volumes not mandated) <br /> Sample Handling Cap ends,place in culture tube, keep chilled at 4°C <br /> Media Hold Time Not specified-recomme ad 30 days at 4°C <br /> Sample Hold Time 30 days from collection at VC <br /> Field QC Field Blanks - two per SalnjDling event. <br /> Distributed Pair One location sampled at two volumes <br /> 0 <br /> 1� <br />