Table 3.

Characterisation of physicochemical properties of surface sediments collected in river estuaries (A), in the coastal zone (B) and at stations located some distance away from the coast below the 4-m isobath (C)

Sampling station/variable		W [%]	LOI [%]	TC [%]	OC [%]	BC [%]	Type of sediment
Min–max
A. Rivers
ST6	Gizdepka River	12.6–26.1	0.3–0.8	0.087–0.455	0.017–0.580	0.007–0.035	Medium sand
ST2	Kacza River	12.5–17.8	0.5–21.6	0.170–0.515	0.040–0.226	0.068–0.087	Pebbles
ST1	Vistula Swibno	18.0–22.2	0.3–6.2	0.140–0.301	0.051–0.158	0.027–0.047	Silt
B. Coastal station
ST7	Swarzewo	20.3–30.4	0.4–2.7	0.152–0.782	0.033–0.568	0.003–0.071	Medium sand
ST5	Mechelinki	12.8–21.6	0.1–0.5	0.156–0.603	0.019–0.053	0.025–0.091	Coarse sand
ST4	Gdynia Seaside Boulevard	7.0–18.5	0.3–0.8	0.133–0.610	0.017–0.070	0.002–0.097	Coarse sand
ST3	Orlowo Pier	16.3–19.9	0.2–6.1	0.070–0.249	0.006–0.065	0.001–0.062	Medium sand
C. Station below 4 m depth
ME		13.9–21.7	0.4–13.5	0.102–0.336	0.047–0.107	0.008–0.047	Medium sand
SP		16.1–23.4	0.3–1.1	0.008–0.402	0.065–0.364	0.013–0.030	Medium sand
GDY		14.7–61.8	0.4–11.1	0.142–3.189	0.092–2.577	0.002–0.252	Medium sand
GN		17.0–34.0	0.4–2.7	0.235–2.027	0.121–1.450	0.009–0.215	Silt
UW		17.1–63.0	0.4–16.6	0.101–3.331	0.070–2.742	0.010–0.271	Silt

W wetness, LOI loss of ignitron, TC total carbon, BC black car bon, OC organic carbon