Eruption of the Nyiragongo Volcano on 22 May 2021: Chemical Composition of the "Volcanic Salt" and Collateral Risk

Abstract

The present study aims to assess the chemical composition of the NaCl-like salt identified on the lava flows of the Nyiragongo volcanic eruption of May 22, 2021, in Kibati not far from the N02 road, in the Bukumu chiefdom; in order to determine its positive or negative impact on the health of the population (for consumers). Samples of these salts are subjected to organoleptic and chemical analysis at the laboratories of the CEEC (Center of Expertise for the Evaluation and Certification of Mineral Substances,) and the OCC in Goma. The results obtained obtained the presence of major elements whose content is greater than 100ppm (mg / kg) and other trace elements whose contents are below 1000ppm, other than certain radioactive elements. These elements come from the magma in a high temperature molten silicate bath, which has given rise to rock (salt) on the surface by rapid cooling of the lava. The high content of silicon and potassium and sodium alkalis clearly shows the alkalinity of the magma of this volcano. It is not in any way the NaCl consumption salt put rather alkalized silica rich in potassium and sodium.