Iulia Mihaela NANU, Isidora RADULOV
Water is an important factor in ecological balances and its pollution is a current problem with consequences more or less serious on the population. Safe drinking water is essential to humans and other life forms even though it provides no calories or organic nutrients. Access to safe drinking water has improved over the last decades in almost every part of the world, but approximately one billion people still lack access to safe water and over 2.5 billion lack access to adequate sanitation. Some observers have estimated that by 2025 more than half of the world will be facing water-based vulnerability. A recent report suggests that by 2030, in some developing regions of the world, water demand will exceed supply by 50%. Water plays an important role in the world economy as it functions as a solvent for a wide variety of chemical substances and facilitates industrial cooling and transportation. Approximately 70% of the fresh water used by humans goes to agriculture. By water pollution, we usually understand impairing the physical, chemical and biological characteristics, produced directly or indirectly by human activities, and that makes the waters to become unsuitable for normal use in the purposes for which such use was possible before interfering altering. In this paper we analyzed surface waters in order to determine its pollution degree. The main pollution factors in area are human agglomerations, industry and agriculture. Samples were taken in the village Sag, Timis county where agricultural pollution sources are considered most important. The parameters analyzed were pH, content of nitrates, nitrites, ammonia and heavy metals. Water samples analysis were made in the Soil Science laboratory from USAMVBT. pH was determined by potentiometric method, nitrates, nitrites and ammonia content by colorimetric method and heavy metals trough atomic absorption spectrometry. Exceeding the maximum limits in surface waters was determined for nitrate and ammonium. Heavy metal content has recorded values ​​above limits.
nitrate, heavy metals, pollution, water
Presentation: oral