Table 2.

Characterisation of 4-nonylphenol and 4-tert-octylphenol concentration in sediment samples collected in river estuaries (A), at shallow coastal stations (B) and at deeper open water stations (C)

Sampling station/variable		4-nonylphenol [ng∙g−1 dw]	4-tert-octylphenol [ng g−1 dw]
A. Rivers
		Min–max	Min–max
ST6	Gizdepka River	<LOQ—4.93	0.55–47.12
ST2	Kacza River	<LOQ—2.21	<LOQ—8.51
ST1	Vistula Swibno	<LOQ—4.44	<LOQ—23.43
n		18	18
x ± SD		2.26 ± 1.63	7.58 ± 13.43
Median		0.63	2.71
B. Coastal station
ST7	Swarzewo	<LOQ—3.13	0.5–48.88
ST5	Mechelinki	<LOQ—2.32	0.14–38.72
ST4	Gdynia Seaside Boulevard	<LOQ—13.56	<LOQ—18.74
ST3	Orlowo	<LOQ—2.21	0.16–14.90
n		24	24
x ± SD		2.35 ± 3.38	9.57 ± 13.45
Median		1.34	3.24
C. Open water stations (depths over 4 m)
ME		<LOQ—0.23	0.15–2.45
SP		<LOQ—2.66	1.02–11.75
GDY		<LOQ—4.24	0.34–20.47
GN		0.08–3.95	1.77–17.89
UW		<LOQ—249.08	2.61–18.44
n		30	30
x ± SD		12.58 ± 52.83	5.30 ± 5.51
Median		1.06	2.61

n sampling number, x mean value, SD standard deviation, LOQ limit of quantification, LOQ = 0.08 ng g⁻¹ dw