engleski

Folic acid in coastal waters of the Adriatic sea

The concentration of folic acid (FA), an important constituent of the vitamin B group, was determined over a period of two years in the water column of a small meromictic saline lake on the eastern Adriatic coast( Rogoznica lake), as well as in the western part of the northern Adriatic Sea.The FA concentration was over the range of 0.1-13.5 nM in the oxic part of Rogoznica Lake, and 0.1- 22 nM in the northern Adriatic, with a maximum of 22 nM in the upper layer of the water column, possibly caused by the impact of the Po river freshets on the FA concentrations. A weak but statistically significant correlation was established between photosynthetic pigment zeaxanthin , a characteristic biomarker of cyanobacteria, and FA in the oxic layer of the Rogoznica lake ( r2= 0.367 ; n=29 ; P<0.01), indicating cyanobacteria as a possible source of FA in this ecosystem. A statistically significant correlation (r2=36 ; n=18 ; P<0.01)between this two parameters was also found in the surface layer of the northern Adriatic (0m).

cyanobacteria; photosynthetic pigments; voltammetry

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