| Autor: |
Kristin M. Omberg, Linda D. Stetzenbach |
| Rok vydání: |
2014 |
| Předmět: |
|
| DOI: |
10.1128/9781555817473.ch6 |
| Popis: |
This chapter aims to provide information on the selection and deployment of air sampling systems for detecting biological agents in both indoor and outdoor settings. In the first half of the chapter, the most widely used collection techniques and classes of currently available instrumentation are presented along with a discussion of the advantages and disadvantages of each. The second half of the chapter addresses field deployment and use of aerosol collection systems, including methods of choosing appropriate sites and ensuring proper sampler placement. Air sampling is performed to document the concentration and composition of airborne biocontaminants. The most important property of aerosol-dispersed biocontaminants to be considered in air sampling is their tendency to settle onto surfaces and be redispersed as a result of air movement and physical disturbance. The process of settling and reaerosolizing continues until the airborne microorganisms are removed from the environment. A wide variety of aerosol samplers and methods have been used to collect airborne biological materials in indoor and outdoor environments. Impaction is the process of forcing particles from the air onto a solid or semisolid surface. Impaction samplers are widely used for the collection of culturable airborne microorganisms. Ideally, air samplers should collect all airborne microorganisms without affecting their ability to be detected. The sampler should be well separated from nearby structures such as walls or pillars. A general rule of thumb is that the sampler should be placed at a distance of twice the height of an obstruction away from the obstruction. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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