Rapid surface sampling and archival record system (rssar)

摘要

The objective of this work is to develop a surface sampling device that will enable quick characterization of concrete and steel surfaces. A bulk sampling over is also being developed which will enable characterization of loose bulk debris that is sized to 1 cm~3. The samplign device consists of a sampling head (steel or concrete), a quick look detector,a nd an archiving system (sorbent tube). The sampling head thermally desorbs semi-volatile contaminants, such as polychlorinated biophenyls, oils, and other organics, from concrete and steel surfaces. The volatilized materials are passed through a quick-look detector and an indication of the presence or absence of contamination is given. The sensitivity of the quick-look detector can be attenuated for various levels of sensitivity. Volatilized materials are trapped in a tube filled with an appropriate solid phase adsorbent. The tubes are housed in a magazine which also archives information about the sampling conditions such as air flow rates, sampling temperatures. A more detailed and automated analysis of the tubes can be done at a later date by transferring the magazine to a thermal desorption instrument.