List of publications on a keyword: «chlorine»
Проектная деятельность в школе
Karasiova Irina Gennad'evna , учитель начальных классов
гимназия №168, Санкт-Петербург , Санкт-Петербург г
«The water we drink»
Water has unique properties. The chemical composition of water is very important for humans, since a person 60-70% consists of water. My research was devoted to the study of the content in the water of the rivers of St. Petersburg of such chemical elements as iron and chlorine. The results of the research showed that tap water meets the sanitary requirements of drinking water quality, while in the river waters there was an increased content of the investigated elements.