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Method TO-10A Pesticides/PCBs <br /> 7.3.14 Steam Bath. <br /> 7.3.15 Heating Mantles. 500 mL. <br /> 7.3.16 Analytical Evaporator. Nitrogen blow-down. <br /> 7.3.17 Acetone. Pesticide quality. <br /> 7.3.18 n-Hexane. Pesticide quality. <br /> 7.3.19 Diethyl Ether. Preserved with 2%ethanol. <br /> 7.3.20 Sodium Sulfate. Anhydrous analytical grade. <br /> 7.3.21 Alumina. Activity Grade IV, 100/200 mesh. <br /> 7.3.22 Glass Chromatographic Column. 2-mm I.D. x 15-cm long. <br /> 7.3.23 Soxhlet Extraction System. Including Soxhlet extractors (500 and 300 mL), variable voltage <br /> transformers,and cooling water source. <br /> 7.3.24 Vacuum Oven. Connected to water aspirator. <br /> 7.3.25 Die. <br /> 7.3.26 Ice Chest. <br /> 7.3.27 Silicic Acid. Pesticide grade. <br /> 7.3.28 Octachloronaphthalene(OCN). Research grade. <br /> 7.3.29 Florisil. Pesticide grade. <br /> 8. Assembly and Calibration of Sampling System <br /> 8.1 Description of Sampling Apparatus <br /> 8.1.1 A typical sampling arrangement utilizing a personal air pump is shown in Figure 1. This method is <br /> designed to use air sampling pumps capable of pulling air through the sampling cartridge at flow rates of 1 to <br /> 5 L/min. The method writeup presents the use of this device. <br /> 8.1.2 The sampling cartridge(see Figure 2)consists of a glass sampling cartridge in which the PUF plug or <br /> PUF/Tenax®TA"sandwich" is retained. <br /> 8.2 Calibration of Sampling System <br /> 8.2.1 Air flow through the sampling system is calibrated by the assembly shown in Figure 4. All air sampler <br /> must be calibrated in the laboratory before and after each sample collection period,using the procedure described <br /> below. <br /> 8.2.2 For accurate calibration,attach the sampling cartridge in-line during calibration. Vinyl bubble tubing <br /> or other means(e.g.,rubber stopper or glass joint)may be used to connect the large end of the cartridge to the <br /> calibration system. Refer to ASTM Practice D3686 or D4185, for procedures to calibrate small volume air <br /> PUMPS. <br /> 9. Preparation of PUF Sampling Cartridges <br /> 9.1 The PUF adsorbent is white and yellows upon exposure to light. The"yellowing" of PUF will not affect its <br /> ability to collected pesticides or PCBs. <br /> 9.2 For initial cleanup and quality assurance purposes, the PUF plug is placed in a Soxhlet extractor and <br /> extracted with acetone for 14 to 24 hours at 4 to 6 cycles per hour. <br /> Page 10A-6 Compendium of MethodsJor Toxic Organic Air Pollutants January 1999 <br />