“…These results are described in several studies (Matoničkin et al, 1971;Srdoč et al, 1982Srdoč et al, , 1985Srdoč et al, , 1986Srdoč et al, , 1987Srdoč et al, , 1994Kempe and Emeis, 1985;Emeis et al, 1987;Chafetz et al, 1994;Horvatinčić et al, 2000;Plenković-Moraj et al, 2002;Frančišković-Bilinski et al, 2004;Matoničkin Kepčija et al, 2006Golubić et al, 2008;Horvatinčić, 2013). Lakes sediments (Popović et al, 1986;Horvatinčić et al, 1999;Obelić et al, 2005;Šutić et al, 2009;Krajcar Bronić et al, 2010;Barešić et al, 2011;Herceg Romanić, 2012) and anthropogenic pollution of lakes Barešić, 2009). Over the catchment area (panel a), the water (H 2 O) from precipitation, while percolating through permeable upper layers, dissolves carbon dioxide (CO 2 ) from humus, thus forming diluted carbonic acid.…”