engleski

Landfill fire as source of Dibenzo-p-dioxins and Dibenzofurans in air and lake sediment from Vransko Lake

Lake sediment and air samples from Vransko Lake were analyzed for the presence of Dibenzo-p-dioxins (PCDDs) and Dibenzofurans (PCDFs) compounds. Waste incineration is one of the formation mechanisms for these compounds. A landfill site is located near the lake, and landfill fire ccasionally occur accidentally. The first two centimetres of lake sediment were sampled in the summer of 2008 and 2010 to determine whether dry deposition of PCDDs and PCDFs - formed during landfill fire - ended up in the lake. Outdoor air was collected during a 2007 landfill fire for a 5 day period, with a total sample volume of 485, 623 m3. The air was pumped through an air sampling pump with integrated adsorption unit of polymer resin (XAD), which was later analysed. All analyses were determined by high-resolution gas chromatography - high resolution mass spectrometry (HRGC/HRMS). The total sum of PCDDs and PCDFs in the air was 1940, 4 fg/m3, with a toxic equivalence of 22, 92 fg I-TEQ /m3. The total sum of PCDDs and PCDFs in the lake sediments was 17, 93 ng/kg (sampled in the year 2008) ; 17, 21 ng/kg and 23, 17 ng/kg (sampled in the year 2010). I-TEQ for sediments were 0, 046 ng/kg, 0, 165 ng/kg and 0, 03ng/kg, as follows. The major source of these compounds for humans is through food, since they bioaccumulate. The fish from Vransko Lake is often consummed as the lake is popular with sport fishermen. The determined values of PCDDs and PCDFs in all analysed samples – both sediment and air - were within a tolerable level, but further analysis, especially in a time of landfill fire, as well as analysis of fish tissue would be welcome.

Dibenzo-p-dioxins (PCDDs); Dibenzofurans (PCDFs); Lake sediment; Landfill conflagration

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