Detection of diatoms in water and tissues by combination of microwave digestion, vacuum filtration and scanning electron microscopy.

The detection of diatoms has been proposed to be useful in the diagnosis of drowning. In the presented paper, we describe a novel method for qualitative and quantitative analysis of diatoms in water and organs. Samples were treated by microwave digestion. The fluid obtained was vacuum-filtrated; its sediment on the membrane was coated and examined under the scanning electron microscope with the mode of automatic field scanning; and qualitative and quantitative diatom analysis was performed based on the images captured automatically and on manual identification of the suspected diatoms at a required higher magnification. The method is rapid, sensitive, labor-saving, and accurate for qualitative and quantitative diatom analysis. However, further scientific research in the field of automatic diatom identification using SEM images has to be done in order to automate the process of detection and identification of diatoms in water and tissues for the diagnosis of drowning.