Russian geochemists proved the danger of volcanic «nanoash»
Most often, the ash is composed of small (up to 2 mm) particles of silicon oxide and silicates. Recently, the researchers have disclosed a nanophase in there — the particles less than 1 micron. Such particles are especially mobile and can easily enter a living organism not only by breathing or deglutition but also through the skin.
Russian scientists have compared samples taken at three volcanoes — Klyuchevskaya Sopka and Tolbachik from the mountain group of Kamchatka, and Puyehue from the mountain group of Andes in Chili. It has been turned out that the samples of nanoash contain large amounts of toxic metals, for example, the concentration of mercury is so high that even 0.5 grams for such ash in a room of 40 cubic meters will make an air hazardous for a human.