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SUMMARYThe objective of this study was to estimate the impact of land use on the surface water quality. Water samples were collected in the main drainage channel, in the agricultural area of Lonja field, Croatia. Lonja field is the largest protected wetland in both Croatia and the entire Danube basin. It extends along the river Sava and the lower course of the river Lonja. Sampling was performed during the spring months in 2015, 2016 and 2017. Investigation was done through the measurements of physicochemical indicators: pH value, biochemical oxygen demand (BOD), concentration of oxygen, nitrate, phosphate, trace metals (Zn, Pb and Cd), dissolved organic carbon (DOC), and surface active fraction of DOC. The obtained results were compared with those of the Lonja and Sava rivers. The significant higher concentrations of DOC (up to about 13 mg C dm -3 ) have been observed in the water from main drainage channel. It is known that, high DOC concentrations in surface waters have negative effects on the water quality and water habitats.

Mercury entering aquatic environment can be transformed by microorganisms into toxic methyl-mercury that biomagnifies in aquatic organisms. Seafood consumption is primary exposure route to mercury for humans. The most vulnerable groups are unborn and young children. The aim of this article is to investigate if there possible connection of fish consumption and mercury body burden in women of reproductive age in Croatia.