Construction And Calibration Of A Condensation Nucleus Counter For The Measurement Of Aitken Particles In The Harmattan Haze

One type of atmospheric condensation nucleus i s the Aitken p a r t i c l e which has r a d i i ranging between 0.005 and 0.1 microns. In t h i s work, a locally constructed condensation nucleus counter s u i t a b l e for the measurement of the concentration of Aitken nuclei in the Harmattan haze is described. F i l t e r e d a i r is drawn into the previously evacuated . system to a pressure of about 2 x 104 Pa and then released. The concentration of the Aitken nuclei in the air drawn into the apparatus is deduced from the reading of the photocurrents Io and I through the pressurized and rarefied a ir in the system respectively. Measurements of p a r t i c l e s in ambient air with the counter show that the concentration of Aitken nuclei in the l o c a l i t y is up to 3 x 1011 p a r t i c l es per l i t r e.

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