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8020 / 3 4.5 GC columns: Column 1: 6 -ft x 0.082 -in. I.D. #304 stainless steel or glass tubing. Packed with 5% SP -1200 ¢ 1.75% Bentone 34 on 100/120 mesh Supelcoport. Column 2: 6 -ft x 0.1 --in. I.O. #304 stainless steel or glass tubing packed with 5% 1,2,3-tris(2-cyanoethoxy)propane on 60/80 mesh Chromosorb W -AW. 4.6 Detector: Photoionization (PID). 4.7 Syringes: 5 -ml glass hypodermic with Luerlok top (2 each). 4.8 Microsyringes: 10, 25, 100 pl. 4.9 Two-way syringe valve with Luer ends (3 each). 4.10 Syringe: 5 -ml, gas-tight with shutoff valve. 4.11 Bottle: 15-m1 screw -cap, with teflon cap liner. 5.0 Reagents 5.1 Activated carbon: Filtrasorb 200 (Calgon Corp.) or equivalent. 5.2 Organic -free water: Generated by passing tap water through a carbon filter bed containing about 1 lb of activated carbon. A water pur- ification system (Millipore Super -Q or equivalent) may be used to generate organic -free deionized water. Organic -free water may also be prepared by boiling water for 15 min. Subsequently, while maintaining the temperature at 90' C, bubble a contaminant -free inert gas through the water for 1 hr. 5.3 Stock standard solutions: Stock standard solutions can be prepared from pure standard materials or purchased as certified solutions. Prepare stock standard solutions in methyl alcohol using assayed liquids. Because of the toxicity of many of the compounds being analyzed, primary dilutions of these materials should be prepared in a hood. A NIOSH/MESA-approved toxic gas respirator should be used when the analyst handles high concentrations of such materials. 5.3.1 Place about 9 ml of methyl alcohol into a 10-m1 ground- glass -stoppered volumetric flask. Allow to stand about 10 min or until all alcohol -wetted surfaces have dried. Weigh the flask to the nearest 0.1 Mg. 5.3.2 Using a 100-p1 syringe, immediately add an amount of assayed reference material to the flask, then reweigh. Be sure that the reference