Proceedings PaperRole Of Nonsphericity Of Marine Particles In Light Scattering And A Comparison Of Results Of Its Determination Using Sem And Two Types Of Particle Counters
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Nonspherical particles have projected areas, averaged over all their orientations, greater than those of equal volume spheres. As a result, the refractive index of such particles may be overestimated when it is determined from light scattering and a size distribution obtained with a Coulter counter or a similar volume-sensitive device. When the refractive index is known, the volume of nonspherical particle may be overestimated when calculated using a size distribution obtained from light scattering. This can be avoided if the nonsphericity of the particles (ratio of the projected area of the particle averaged over all its orientations to the projected area of an equal volume sphere) is known. A method for the determination of the nonsphericity of suspended particles is proposed. It is based on a relationship between the size distributions of the particles obtained using a volume-sensitive and projected-area-sensitive particle counter. The nonsphericity of several kinds of particles, including coastal marine particles was estimated using this method. The values obtained agreed with those determined using a SEM and an optical microscope.