Physico-Chemical Characteristics of the Karst Lake Ighiu (Romania)

Abstract

The main purpose of this paper is to present basic chemical and physical characteristics of Ighiu lake water, which is controlled by rock weathering, inputs from the chatchment, but it can be further affected by atmospheric deposition processes and biological activity in the water column. The survey was carried out in 2010. Water samples were collected from two different sites covering the middle of the lake and were analyzed for a pre-defined set of physical and chemical indicators to allow the build up of a meaningful database that can be used for comparative assessment and trend delineation. The results have shown a generally good water quality but have also shown the presence of minor traces of pesticides and heavy metals. The obtained data was classified according to Order 161/2006 into five quality classes, and the classification of the lake was established by using the percentile system V (90%).

Palaeohydrological changes during the mid and late Holocene in the Carpathian area, central-eastern Europe

“…Human impact has presumably been relatively high in the area (mainly by pasturing) and accentuated in the last centuries through road construction, damming of the inflows, extensive forestry and, more recently, recreational activities. However, recent investigations of lake water chemistry (Mihăiescu et al, 2012) and trophic status (Momeu et al, 2015) suggest that the lake environment is still oligotrophic (total phosphorus <10 µm/l coupled with generally low ammonium, nitrate and total nitrogen values). The dissolved oxygen (DO) values measured throughout the uppermost water column, on a seasonal basis indicate that the water column is well mixed (Mihăiescu et al, 2012), with a slight decrease in DO during summer when higher water temperatures result in enhanced biological productivity (Momeu et al, 2015).…”

“…However, recent investigations of lake water chemistry (Mihăiescu et al, 2012) and trophic status (Momeu et al, 2015) suggest that the lake environment is still oligotrophic (total phosphorus <10 µm/l coupled with generally low ammonium, nitrate and total nitrogen values). The dissolved oxygen (DO) values measured throughout the uppermost water column, on a seasonal basis indicate that the water column is well mixed (Mihăiescu et al, 2012), with a slight decrease in DO during summer when higher water temperatures result in enhanced biological productivity (Momeu et al, 2015). pH is slightly alkaline with average values around 8.04 and little seasonal variations, which may be interpreted as possibly reflecting the constant input of carbonate ions from the limestone bedrock.…”

The variations of physico-chemical parameters during summer in Lake Erenciuc from the Danube Delta (Romania)

“…The natural conditions of the Danube Delta lead to an intense organic sedimentation within the water bodies (up to 80%) (Romanescu 2006). In higher altitude lakes, where the climate is colder, the organic sedimentation is lower (Mihaiescu et al 2012;Pop et al 2013). Meander lakes, just before turning into oxbow lakes, that are still connected to the river flow, in this case Sfântu Gheorghe, prolong their lives (Romanescu 2005).…”

Forest Stands From Accumulation and Natural Lakes Slopes From the Southern Carpathians

“…Romania is renowned for its 3450 lakes (2300 natural lakes that represent 67% and 1150 artificial lakes -33%), with a total surface of 2.620 km 2 , that covers 1,1% of the total Romanian surface (Mihăiescu et al, 2012). At our country's level, mountain lakes were classified based on their type: accumulation lakes, sliding lakes, glacial lakes and volcanic lakes.…”