Екологічний моніторинг органолептичних і кисневих показників у поверхневих водах Житомирського району в період сніготанення

The results of studies of Zhytomyr region surface waters ecological status by organoleptic and oxygen indicators during the snowmelt period are presented. To studied reservoirs belonged the Teteriv River and its tributaries, the Otsechnoe Reservoir, from which the water intake for drinking purposes for Zhytomyr city. The main sampling points were mapped to the Zhytomyr region. Research methodology. Samples of surface water were collected in plastic 5 liter bottles, which were delivered to the laboratory, settled and then there were carried out laboratory tests by the following methodologies: 1. The methodology of taste, smell, color and turbidity determine – GOST 3351-74. Drinking water. Methods of taste, smell, color and turbidity determine. 2. The methodology of dry residue determines – GOST 18164-72. Drinking water. The methods of dry residue content determine. Studies were conducted during the flood period, when the rivers water level and, accordingly, the impact of environmental factors are the greatest. During 2016-2018, there was not significant tendency for water organoleptic and oxygen indicators changes. The highest excess of norm levels determined by DSanPin 2.2.4-171-10 and DSTU 4808:2007 were observed for such indicators as color and biological oxygen consumption (BOC). Over-normal value of color and biological oxygen consumption indexes were found in almost all water samples. Somewhat better, but not much was the situation with the water turbidity index. According to this indicator, in 2016 there were contaminated more than 80 %, in 2017 – 50 % and in 2018 – 73 % of samples respectively. Excess of the water odor norms was not observed in any of the tested samples for all three years. In almost all samples, the odor was faint, catching its earthy hue, which is the norm for the flood period. Based on the results obtained, it can be argued that the surface waters of the Zhytomyr region belong to the second class of quality, that is, waters that have increased values of turbidity (up to 150 mg/dm3) and color (up to 120 degrees on the platinum-cobalt scale) and can be refered to polysaprobic waters (BOC5 of which more than 12 mg O2/dm3).