Water is life, it is an environmental factor without which man would not be able to carry out any kind of activity, being necessary both for daily personal consumption and for the development of industries. Water leakage on the earth's surface is the mechanism by which erosion sculpts the natural environment, leading to the creation of valleys and delts with fertile surfaces favorable to the development of human centers. It is a major topic of interest that this environmental factor is the most polluted of all. Thus, due to pollution, the biological and physico-chemical conditions of an ecosystem are modified. This aquatic ecosystem can be represented by both still and flowing waters. The work aims to present the water quality of the Mures River on the section Savarsin - Arad - Nadlac for a period of three consecutive years, namely, 2017, 2018 and 2019. The analyses were carried out within the Mures Water Basin Administration. Following water analyses carried out by the Water Quality Laboratory of the Mures Water Basin Administration, the results were compared and interpreted with the physico-chemical quality standards of Order 161 from 2006. The following indicators were targeted for assessing the ecological status/ecological potential of the chemical status respectively: biochemical oxygen consumption (CBO5),chemical oxygen content (CCO-Cr), dissolved oxygen, total nitrogen (N total), ammonium (N-NH4),nitrites (N-NO2),nitrates (N-NO3),total phosphorus (total P), phosphates (P-PO4),anion-active detergents, total phenols, dissolved arsen, dissolved chromium (Cr3++ Cr6+), dissolved copper (Dissolved), dissolved zinc, dissolved nickel and dissolved lead. Based on the analyses carried out, it was found that most indicators fall into the higher quality classes, with the exception of the biochemical oxygen consumption (CBO5), whose 2017 values were in the third quality class, and then improved their values thus reaching the second quality class from 2018. As well as the chemical oxygen content (CCO-Cr) which in 2017 and 2018 is in the quality class III, then in 2019 reaching the second quality class. The rest of the indicators are in the first and second quality classes.

water quality, nutrients, pollutants, anthropogenic impact, quality indicators

environmental engineering

Presentation: poster