Abstract

Effects of ozone treatment on suspended particles in seawater have been observed. The observations consist of measuring the particle size distribution using an electronic particle counter before and after treating the sample with ozone. Three kinds of response have been observed in the laboratory and in the field: (i) the total elimination of a peak in the size spectra; (ii) a shift of a peak to a smaller size with correspondingly less volume; and (iii) a mild decrease in the total particle concentration. Our interpretation of these responses as observed in the field are respectively: (i) phytoplankton with a very small amount of refractory structural materials (e.g. naked flagellates); (ii) particles that individually contain both refractory and non-refractory components (e.g. diatoms); and (iii) primarily non-organic and refractory organic materials.

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