engleski

Occurrence of Analgesics in Municipal Solid Waste Landfill and Adjacent Groundwater Aquifer

A comprehensive study conducted at the main landfill of the city of Zagreb, which aimed at identifying specific organic contaminants in the landfill and adjacent aquifer, indicated that pharmaceutical chemicals were among the most abundant compounds. This paper focuses on the identification of analgesic organic compounds in solid waste, landfill leachate, underlying soil and groundwater. The main types of analgesic compounds found in the landfill were propyphenazone (4-(1-methylethyl)-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one), aminopyrine (4-(dimethylamino)-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one) and caffeine (3,7-dihydro-1,3,7-trimethyl-1H-purine-2,6-dione). All identifications were performed by gas chromatography/mass spectrometry operated in full scan mode, while quantitative determinations were carried in single ion monitoring mode. The spatial distribution of analgesics in solid waste was rather heterogenous but the most abundant analgesic, propyphenazone, was detected in all analysed samples. The concentration of propyphenazone in solid waste varied across the range of 0.02-19.7 mg/kg, while the concentration in underlying soil was much lower (0.008-2.9 mg/kg). Aminopyrine and propyphenazone were also detected at significant concentrations in landfill leachate and groundwater, indicating an efficient vertical transport through the unsaturated zone. The concentration of aminopyrine and propyphenazone in groundwater near the landfill was typically in the range from 1 to 50 microg/l, while the concentration of caffeine was mostly below 10 ng/l.

aminopyrine; caffeine; groundwater; minicipal landfill; pharmaceutical chemicals; propyphenazone

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