Quality of sediments Sample Clauses

Quality of sediments. The assessment of the level of sediment pollution within the frame of the Joint monitoring was carried out according to the „Canadian Sediment Quality Guideline for Protection of Aquatic Life” (CSQG) of 1999, modified in 2002. The comparison of measured values is performed against two limits - the Threshold Effect Level (TEL) and the Probable Effect Level (PEL). Sediment sampling was carried out at four sampling sites, both on the Slovak and the Hungarian sides. The situation of sampling sites is shown in Fig. 2-1. The Slovak Party took performed the sampling in autumn at the time of low flow rates (in September) and the Hungarian Party sampled in the spring (in April). Inorganic and organic micro-pollution was determined in the analysis of sediment samples. In the frame of inorganic pollution, eight heavy metals were analyzed (arsenic, cadmium, chromium, copper, nickel, lead, mercury and zinc) and from the organic contamination the analysis included substances from the PAH group and on the Hungarian side also the amount of total phosphorus and total nitrogen. Inorganic micro-pollution of sediments at observed locations on the Slovak territory in 2019 generally slightly increased compared to the year 2018. Concentrations of arsenic and lead increased mainly, cadmium contents were similar. A slight decrease of concentrations was recorded only on two sampling sites in the case of copper and zinc (No. 307 and 4301), and on one site in the case of chromium (No. 307). Compared to the limits of the Canadian standard CSQG, the mercury concentration higher than the threshold limit (TEL=0.17 mg.kg-1) occurred on only one site No. 4301 in the river branch system (0.18 mg.kg-1). Concentrations of chromium, lead and zinc on two sampling sites (No. 311 in the lower part of the reservoir and No. 4301 in the river branch system) corresponded to a slightly contaminated sediment, at they slightly exceeded the lower limit of the range >TEL and <PEL. The measured concentrations of chromium reached 42.8 mg.kg-1 on No. 311 and 41.9 mg.kg-1 on No. 4301 (TEL=37,3 mg.kg-1, PEL=90,0 mg.kg-1), the lead concentrations reached 37.6 mg.kg-1 on No. 311 and 35.9 mg.kg-1 on No. 4301 (TEL=35,0 mg.kg-1, PEL=91,3 mg.kg-1), and in the case of zinc values of 128 mg.kg-1 on No. 311 and 133 mg.kg-1 on No. 4301 were found (TEL=123 mg.kg-1, PEL=315 mg.kg-1). In the case of copper, concentrations lower than the threshold limit was found only on the sampling site No. 307, on the other three locatio...
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Related to Quality of sediments

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