An improved DNPH cartridge aldehyde sampler for 3-day unattended sampling
- Entech Lab. Automation, Simi Valley, CA (United States)
A new aldehyde/ketone sampler is presented that conforms to the requirements and QA/QC set forth by Federal, State, and Local monitoring agencies. The 32-position sampler allows up to 4 days of unattended sampling if spikes and duplicates are not utilized. To improve QA, 3-days of sampling can be scheduled allowing one duplicate and one spike to be obtained every 24 hours in addition to the eight ambient air samples. Two sampler positions left unused can then be analyzed as field blanks. To provide for the simultaneous collection of samples and spikes or duplicates, two 2,000 sccm electron mass flow controllers are used to control the 1 l/min required flow rates. An onboard microcomputer both controls the MFC`s and records their actual flow rates for later downloading to a Windows based software package for reporting. Programming and data retrieval can be performed using a local PC system running under Windows{trademark} or by a remote system using a modem. Provisions are made for continuously adding a surrogate standard for added quality assurance for both field sampling and laboratory extraction and analysis. An ozone scrubber is utilized which reduces sample losses on the cartridge due to oxidation of the carbonyl-DNPH complex. Default sampling protocols are provided, although a flexible Windows based editor allows considerable user modification to the sample collection scheme. Field data and software will be presented showing precision and practical advantages.
- OSTI ID:
- 197522
- Report Number(s):
- CONF-9405167--
- Country of Publication:
- United States
- Language:
- English
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