Table 2.

Statistical characterisation of total mercury concentrations (in nanogram per gram dry weight) in styrofoam debris collected at particular stations

Area	n a	Station	Mean ± SD	Range (ng g−1 d.w.)	Median	Lower quartile	Upper quartile
Gulf of Gdansk	166	st.1	9.01 ± 3.85	5.21–16.4	7.75	5.89	11.5
		st.2	6.64 ± 3.51	0.61–13.7	5.88	4.14	9.35
		st.3	5.88 ± 3.54	2.16–11.9	4.30	2.96	8.15
		st.4	6.18 ± 3.98	0.15–14.8	4.74	4.08	8.11
		st.5	4.49 ± 3.99	0.24–15.4	3.42	2.95	4.28
		st.6	403 ± 1018	1.92–3863	14.2	3.99	285
		st.7	100 ± 196	2.63–778	7.25	4.89	176
		st.8	15.9 ± 50.8	0.02–261	1.61	0.47	10.5
		st.9	4.87 ± 2.88	2.11–9.8	4.05	2.35	7.55
Open Baltic	24	st.10	4.53 ± 2.37	2.69–8.59	3.57	3.20	4.62
		st.11	2.14 ± 1.49	0.18–4.65	1.73	1.55	2.12
		st.12	8.75 ± 1.08	7.37–9.98	8.82	8.02	9.48
Gołdap Lake	24	st.13	5.96 ± 2.82	3.44–12.9	5.58	3.54	6.85

^aAs in Table 1