Abstract
This chapter focuses on aerosol sampling and measurement techniques. The methods applied for atmospheric aerosol sampling include filters and cascade impactors, which collect the aerosol particles onto a surface. The collected sample must therefore, be evaluated for size and composition. Because accumulation mode aerosols (fine aerosol particles) contain a substantial fraction of liquid material at normal temperatures and humidities, these fine aerosol particles must be sized in situ without precipitation. Many aerosol-measuring techniques, such as the condensation nuclei counter, CNC, and filter collectors, integrate some response function of the instrument with the particle size distribution. In the particle-counting method, the response is essentially equal to the integral of the number distribution weighting. Simplicity during sampling may mandate the use of a particular collection method despite its other problems. The rapid development of modern electronics and inexpensive acquisition systems has led to in situ , automatic, and complex monitoring techniques. Collection methods are being replaced with both physical and chemical analysis in situ , automatic methods and digital electronic devices.
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