Assessment of Water Quality in the Lakes Along Colentina River

Abstract

The purpose of this study is to evaluate the water quality in the lakes along Colentina River according to Romanian regulations referring to the norms on surface water quality classification, MO 161/2006. To achieve this goal, two sampling sections (entry and exit points) for each lake have been established, and the following indicators have been determined: pH, water temperature, dissolved oxygen, biochemical oxygen demand, chemical oxygen demand, nitrites, nitrates and ammonium nitrogen, total nitrogen, orthophosphates, total phosphorus, electrical conductivity, filterable residue, chlorides, sulphates, calcium, magnesium and sodium. Following this study, the variation of the concentrations of determined indicators in the two sampling sections for each lake has been assessed, as well as the classification into quality classes according to the before mentioned order.

A comparative evaluation of surface water quality standards for lakes and fish ponds from Bucharest and vicinity

“…The level of phosphate phosphorus of 1.37 mg/L and nitrate nitrogen of 1.47 m/L produced a high density of euglenophytes, as reported by Rahman and Khan [30]. High phosphate levels were reported by other authors for Herastrau and Pantelimon lakes [23]. Concerning the influence of phosphorus on fish life, Jespersen and co-workers [31] showed that the bodyweight of cyprinids decreases with the increase in phosphorus content of water samples.…”

“…For investigated locations, the COD values (Table 4) are between 5 and 10 mg O2/L, this range allowing framing the analyzed waters into second quality class for surface waters. For Herastrau and Pantelimon lakes, other authors [23] reported COD values that allow framing the water from these locations in quality class II, as well. Results concerning nitrogen pollutant species In lakes, nitrogen appears as nitrite, nitrate, and ammonium ions, may come from fertilizers (synthetic or organic), wastes from septic systems, surface runoff, or groundwater sources, and all these forms may be used by aquatic plants and algae.…”

“…For example, salmonids are more sensitive than other fish species [26], meanwhile, goldfish, Carassius auratus, seems to have a greater resistance to ammonia [27]. Based on ammonium levels reported in other studies [23], water from Herastrau and Pantelimon lakes are framed in II quality class. According to nitrate and nitrite levels, reported by the same authors, for the same locations are attributed to quality classes I and IV, respectively.…”

The Assessment of Content and Dynamics of Nutrients in Water and Sediments from the Plumbuita Lake, Bucharest. I. Study on Phosphorous Content and Distribution

“…Water indicators were analysed using adequate standardised methods and validated similar to procedures described elsewhere [38,39].…”