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s a Page 1 of 2 <br /> Vicki McCartney [EH] <br /> From : Karen Lopez [klopez@airtoxics.com] <br /> Sent: Wednesday, June 10, 2009 3: 14 PM <br /> To: Vicki McCartney [EH] <br /> Cc: 'Jennifer Miller' <br /> Subject: RE: A question <br /> Attachments: ATT68943 .txt; Sorbent Sampling Guide 4-08. pdf <br /> Hi Vicki , <br /> The method we are running these days for TPH-D is TO-17 which is a sorbent method . We no longer offer <br /> NIOSH Method 1550 for TPH-D. I have attached a table that describes the differences between TO-17 and <br /> NIOSH 1550. 1 have also attached our Sorbent Sampling Guide that provides additional information about <br /> collecting a TO- 17 sample. <br /> Parameter TO-17 NIOSH 1550 <br /> Analytical Detector Mass Spectrometer - Allows for Flame Ionization Detector — <br /> definitive identification and `Universal ' detector for <br /> quantitation of compounds of hydrocarbons. Unable to provide <br /> concern such as naphthalene in compound specific information or <br /> addition to a TPH result using the evaluate composition of TPH <br /> total ion chromatogram pattern . <br /> Sample preparation Thermal desorption — provides Solvent extraction with carbon <br /> very low analytical reporting limits disulfide. <br /> (typically 100 to 1000x lower than TPH Diesel = 100 ug <br /> solvent extraction techniques. ) <br /> Less sample volume is required to <br /> meet screening levels which can <br /> be critical for soil gas applications <br /> TPH Diesel = 1 .0 ug <br /> Naphthalene = 0 .005 ug <br /> Please feel free to contact me if you have any additional questions or if you need a formal price quote put <br /> together. <br /> Regards, <br /> Karen P. Lopez <br /> Western Region Account Manager <br /> Air Toxics Ltd . <br /> 180 Blue Ravine Rd. Ste, B <br /> Folsom, CA 95630 <br /> 916-605-3410 <br /> k. lopezoairtoxics . com <br /> J 2ot <br /> www. airtoxics.com <br /> 800-985-5955 <br /> 6/ 10/2009 <br />