Heavy metals in the environment-POSTER SESSION

[CEST2019_00473] Seasonal variation and spatial distribution of Arsenic in groundwater in a ryolithic volcanic area of Lesvos Island, Greece
by Zkeri E., Aloypi M., Gaganis P.

A research conducted in water wells located in the rhyolithic volcanic area of Mandamados, Lesvos Island, Greece, indicated that significant seasonal variation of arsenic concentration in groundwater exists mainly in wells near the coastal zone. However, there were differences among those coastal wells with regard to the processes and factors responsible for the observed seasonal variability of the element, although they are all located in a small homogeneous area. On the other hand, in wells located in higher relief regions, the concentration of As in groundwater followed a fairly constant pattern throughout the year, which is probably related to the faster groundwater flow in this region due to a higher hydraulic gradient. In general, seasonal variation of As in groundwater in the study area was found to be related to geology, recharge rate, topography—distance from coast, and well depth.

Thursday
Poster presentation in Heavy metals in the environment-POSTER SESSION
[CEST2019_00474] Trace metals in soils and water in the area of a small - medium waste electrical and electronic equipment recycling plant
by Zkeri E., Tzoraki O., Lasithiotakis M., Sinioros P.

A research conducted in order to investigate the environmental impact of an e-waste recycling plant to the soil and water resources of the surrounding area. Therefore trace elements in both water and soil samples were determined with Inductively Coupled Plasma – Mass Spectrometry (ICP-MS). Heavy metals in water comply with drinking water criteria, except Pb. Pb, Concentrations of Pb, Cr, Ni, Cu, Mn, Zn were higher in the rainwater collection tank (43.50, 10.90, 18.87, 81.17, 177.99, 330.17 μg/L) than the surficial water inside (8.93, 1.27, 4.97, 17.0, 91.87, 72.97 μg/L) and outside the plant (4.18, 1.28, 1.60, 10.35, 26.21, 12.10 μg/L). Ecological risk of soil samples was assessed with Enrichment Factors. Enrichment factor, for soils showed low to moderate enrichment. The more enriched soil samples in Cu, Pb, Zn, Cd and Hg were two collected west of the company S19 and S20 and two samples collected east S9 and S10.

Thursday
Poster presentation in Heavy metals in the environment-POSTER SESSION
[CEST2019_00738] Selenium accumulation in unicellular photosynthetic algae Chlamydomonas reinhardtii and Thalassiosira weissflogii grown in Se-contaminated media
by Zkeri E., Mavrakis E., Pergantis S., Lydakis-Simantiris N.
Thursday
Poster presentation in Heavy metals in the environment-POSTER SESSION
[CEST2019_00880] The comparison of sediment quality in the rivers the Eastern Slovakia by Potential ecological risk index
by Singovszka E., Balintova M.

The current pollution of sedimentary environment is very serious and exceeds load capacity limit and it is influenced by other external factors such as climate, hydrodynamic conditions, pH, salinity, Eh, temperature and other. This influences can cause the heavy metals are re-released from the sediments which were long-term accumulated what can lead to the deterioration of ecological environment and even pose a threat to the organisms through the food chain.
Distribution, enrichment characteristics of heavy metals (such as lead, cadmium, copper, zinc, mercury and arsenic) in the sediments in the rivers of Eastern of Slovakia, were measured and analyzed in 2017 and 2018. River sediment quality in the territory of East of Slovakia, representing the water basins of the rivers Hornad, Laborec and Torysa, was investigated. Sampling points were selected based on the current surface water quality monitoring network.
The aim of the study is compare sediment quality of monitored rivers between 2017 and 2018 by method Potential Ecological Risk Index Method (PERI).

Thursday
Poster presentation in Heavy metals in the environment-POSTER SESSION
[CEST2019_00976] Mobilisation of Arsenic in groundwater, Lesvos Island, Greece
by Zkeri E., Aloypi M., Gaganis P.

In the present study, a geochemical analysis was conducted to investigate the As occurrence and release in groundwater from two different geological environments on Lesvos island: (i) the volcanic area of Mandamados (ignimbrite) and (ii) the metamorphic area of Tarti that comprises the geologic basement under ignimbrite. Seven sampling campaigns were conducted between October 2010 and October 2011 including 65 groundwater samples from 11 wells and springs. Chemical analyses showed As concentrations exceeding the 10 μg/L national drinking water limit in 46% of the samples from Mandamados. Groundwater composition in Mandamados evolved from Ca-HCO3 type, to mixed type and finally to Na-Cl type along the groundwater flow direction, indicating the contribution of ion exchange in groundwater chemical composition, while Ca-HCO3 type waters were observed in the Tarti area. Arsenic speciation analysis showed that As(V) was the main species in all samples, indicating that As was released under oxidizing conditions. Statistical analysis suggested silicate weathering as the prime mechanism of As release in groundwater in both cases, while, in the Tarti area, carbonate dissolution may represent a secondary mechanism which could be related to the observed relatively low As concentrations in the region.

Thursday
Poster presentation in Heavy metals in the environment-POSTER SESSION