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- W2517894711 abstract "The authors prepare complex mixtures of VOCs in 1.5 liter high pressure cylinders. These cylinders are used as proficiency test samples. Audit materials of this type are usually prepared in humidified SUMMA{trademark} polished canisters. The authors compared the recovery of high molecular weight compounds in humidified canisters and high pressure 1.5 liter cylinders. A high pressure 1.5 liter cylinder containing C2-C10 hydrocarbons at the 5 ppbv level was prepared by diluting a master cylinder containing these compounds at the 50 ppbv level. The contents of this small cylinder were used to prepare a humidified SUMMA polished canister. The relative humidity of the canister was approximately 50% and the final pressure was about 45 psia. Both the 1.5 liter cylinder and the canister were analyzed and compared to a calibration curve prepared using the master cylinder. Recoveries for high molecular weight compounds in the humidified canister were greater, and closer to the theoretical values than in the 1.5 liter cylinder used to prepare the canister. This may happen because the contents were properly delivered from the small cylinder to the canister but that humidity was needed to deliver the higher molecular weight compounds to the detector." @default.
- W2517894711 created "2016-09-16" @default.
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- W2517894711 date "1994-12-31" @default.
- W2517894711 modified "2023-09-24" @default.
- W2517894711 title "Evaluation of the effects of humidity on the transfer of C2-C10 hydrocarbons from cylinders" @default.
- W2517894711 hasPublicationYear "1994" @default.
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