2003 Volume 18 Issue 1 Pages 34-39
A multiple thin film method was developed for identification of internal mixing state of chloride and nitrate in individual aerosol particles. The film was prepared on a polycarbonate film by dual vacuum deposition of silver fluoride and nitron. We examined the applicability of the method by using particles of chloride-nitrate mixture generated by a nebulizer, and confirmed that the mixing states can be identified by the characteristic spots of AgCl ring and needle crystal. It was found that the reaction of chloride with silver fluoride and that of nitrate with nitron are promoted in the presence of water and ethanol vapors. The film was used to detect the mixing states of atmospheric aerosols collected by a low-pressure Andersen Sampler and internally mixed chloride-nitrate particles were observed by SEM (scanning electron microscope).
