Preparation of Tedlar{reg_sign} bag whole air standard with a SUMMA{reg_sign} canister for field VOC analysis
- ENSR Consulting and Engineering, Wilmington, MA (United States)
As the application of field analyses of Tedlar{reg_sign} bag samples is growing, the standard preparation has become more critical. Traditionally Tedlar bag standards were prepared by directly injecting a target compound mixture into a Tedlar bag pre-filled with zero air or nitrogen. It is very time consuming because standards must be prepared daily due to limited stabilities of volatile organic compounds (VOCs) in a Tedlar bag. It also introduces several variables to the process of standard preparation, such as the accuracy of the volume of zero air or nitrogen in the bag and the injection volume of standard mixture. A new application of Tedlar bag standard preparation in the field will be introduced in this paper. A pre-prepared SUMMA{reg_sign} canister standard with targeted VOCs is used to fill a Tedlar bag in the field each day. It takes advantage of long term stabilities of VOCs in a SUMMA canister, simplifies the process of Tedlar bag standard preparation in the field and limits the variables in the process to increase the reproducibility. This paper describes the recent study of this method. Its comparison with traditional method of Tedlar bag preparation is discussed. The results on reproducibility, humidity effects, temperature dependency and time dependent stabilities will be presented.
- OSTI ID:
- 276407
- Report Number(s):
- CONF-950209--
- Country of Publication:
- United States
- Language:
- English
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