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INTRODUCTIONRecent investigations have shown that the atmospheric aerosol is not as internally mixed as it was hitherto thought to be. In continental aerosol, two types of small particles (radius r ≤ 0.15 μm; e.g. Svenningsson et al., 1994) and even three types of large particles (0.2 ≤ r ≤ 2 μm; Eichel et al., 1996) can be identified. Type I particles are nearly insoluble and might be of biological...
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