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Chemistry for Sustainable Development

2003 year, number 6

Possibility of Water Purification from Soluble CaCO3 Admixture with the Help of Recrystallization at -17 oC

Institute of Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences,
Ul. Institutskaya 3, Novosibirsk 630090 (Russia), E-mail:
Pages: 853-857


It is demonstrated experimentally that the application of freezing - unfreezing procedure for the purification of water from soluble amounts of CaCO3 under the conditions recommended for obtaining water from melted ice (freezing ~0.2 l of water at -17 oC) is ineffective. An explanation is the fact that salt freezes into the ice. It is concluded that changes in the concentrations of inorganic impurities cannot be a decisive physicochemical factor for distinguishing between the melted water and the initial one.