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Abstract
The analysis of water quality, regarding the content of metals, especially heavy and radioactive ones, has been carried out in an indirect way, by testing scale formed in a hot-water heater, using water from the water-supply network of the city of Belgrade - the district of New Belgrade. The determination of the composition and the structure of the scale has resulted in its complete identification, and its crystallochemical formula has been defined. It has unequivocally been established that the obtained results are within the tolerance boundary with the results acquired by a conventional analysis of water, when it is a matter of very low concentrations. The presence of radioactive elements of uranium and strontium in a scale sample has been found and the way of their penetrating its composition and structure has been explained. Applying the fractional extraction method, uranium has been established to be of an anthropogenic origin.
Highlights
Drinking water that is utilized from the water-supply system of the city of Belgrade meets all the quality requirements from its consumption in human diet [1]
Chemical substances found in the scale sample and their calculated concentrations in water have been compared with the concentrations of these substances in the WHO Guidelines
The subject of this research work has been the scale developed by heating drinking water from the water-supply system of the city of Belgrade – the district of New Belgrade
Summary
Drinking water that is utilized from the water-supply system of the city of Belgrade meets all the quality requirements from its consumption in human diet [1]. A drinking water analysis is applied to determine its biological soundness, but the emphasis is placed on the presence of different metals, mostly found in traces, which is according to the legal regulations [2,3]. The analysis of water has been made in an indirect way by determining the composition of scale developed from drinking water. The basic idea has been that metals (heavy and radioactive), originating from drinking water, can be detected in scale, but cannot be detected in water if they are present in traces [5,6,7,8,9,10]. The goal has been to establish the way strontium and uranium, being radioactive elements, and not detected in drinking water, became contained in the scale composition. Additional research has been carried out to determine whether its origin is natural or anthropogenic
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