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A sampling technique by which air components could be excluded from sample injections was developed. The injections were all made with Hamilton gas tight syringes. For the detector in use, air gave an analytical curve much different from those of most of the other materials sampled; contamination of the sample was noted by a shifting of the analytical curve toward that of air. To eliminate this contamination, sandwich-size plastic bags were flushed several times with the sample gas to exclude any entrapped air; and the top was twisted tightly to seal in the sample. Within a matter of seconds the syringe needle was inserted through one wall of the bag, and the syringe was flushed several times with the sample by drawing the plunger back and forth several times. The bag of gas, with the syringe still inserted, was placed against the injection port such that the syringe needle was pointed towards the septum. The sample was injected by pushing the needle through the opposite wall of the plastic bag and into the injection port. By using this sampling method, no air contamination resulted.