Total organic carbon in the surface water of the Bulgarian Black Sea coastal zone

Total organic carbon in the surface water in front of the Bulgarian Black Sea coast was investigated episodically over the period 2014-2016. During 13 expeditions conducted with R/V Akademik, samples were collected at stations located in the one-mile zone along the coastline. The results obtained varied from values of the limit of quantification (LOQ) <1 to 10 mg/l. In spring TOC concentrations were lower than in summer and autumn.