Abstract
In order to determine the water quality of Danube River, in the Galati area, the Water Quality Index was calculated. Water Quality Index is a useful number of overall qualities of water. Galati is a Danube port city located in south-eastern of Romania. Samples were taken from 9 places along the Danube starting with the place where the Siret flows into the Danube to the Profiland Steel Plant. Profiland Steel is a company in Galai whose main activities are: sheet and zinc strips; treatment and coating of metals. The monitoring period was one year, from November 2016 to December 2017. Every month, thirty physical - chemical parameters were investigated. In this study the assessment of surface water quality was determined on the basis of various indicators such as: potassium and calcium ions, nitrites, nitrates, total nitrogen, ammonium, chlorides, total phosphorus, sulphates, cadmium, chrome, copper, lead, iron, zinc, density, dissolved oxygen, chemical oxygen demand (CCO-Cr), biochemical oxygen demand (CBO5), electrical conductivity, the density of the conductivity, resistivity, pH, salinity, total dissolved solids. The water quality index (WQI) has been calculated by using Weighted Arithmetic Water Quality Index Method. Two types of correlations were developed: Pearson correlation matrix and Spearman correlation.
Highlights
In order to determine the water quality of Danube River, in the Galati area, the Water Quality Index was calculated
According to the World Health Organization (WHO), water quality expresses the suitability of water to sustain various uses or processes
The water quality indices are mathematical tools, which are used to simplify the information about water quality parameters
Summary
Water samples were collected from nine Danube sites between November 2016 and December 2017. The water sampling points were disposed along the Danube river bank from Galati. The 8th most populous city in Romania, is a port city on the Danube and an important economic centre. During the first part of monitoring period it had been observed that the measured values are the same for D1, D2 and D3 points and for the other two groups of three points. Water anlyses All the 26 indicators for all water samples were investigated, each month during the monitoring period. All water samples were analyzed according to the Romanian standard procedures. Water Standards permissible values used in this study were taken from Romanian Legislation, Order 161/2006. The standards for third category surface waters were used These surface waters are moderately polluted due to human activities [13]
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