Читать книгу Soil Bioremediation - Группа авторов - Страница 22

Heavy metals are found naturally in the environment as result of volcanic eruptions, and sedimentary and metamorphic rock deposits and their releases during weathering and pedogenic processes. These HMs are introduced into soil and groundwater and reaches the human food chain [20, 21]. All HMs in the environment originate in natural phenomena and human activities distribute them to other parts of the ecosystem [22, 23]. In addition, gases and fluid emissions from the earth’s surface, atmosphere, sea floor, and volcanoes are additional important sources of HMs.