Monitoring priority substances in biota under the Water Framework Directive: how effective is a tiered approach based on caged invertebrates? A proof-of-concept study targeting PFOS in French rivers

Environmental Sciences Europe

Table 1 Predicted and measured PFOS concentrations (ng g⁻¹ ww) in fish fillets based on the September campaign (nd: not determined)

Site	Predicted concentrations calculated with						Measured concentrations (fish fillet)
	Median slope		Upper bound (CI 95%) of slope		Lower bound (CI 95%) of slope
	TMF₇₅	TMF₅₀	TMF₇₅	TMF₅₀	TMF₇₅	TMF₅₀
01	nd	nd	nd	nd	nd	nd	3.88
02	19.6	15.1	16.17	12.42	23.10	17.74	10.5
03	11.6	9.15	9.53	7.54	13.62	10.76	8.89
04	8.60	7.08	7.08	5.83	10.11	8.33	252
05	310	203	256	168	365	239	7.86
06	16.1	12.7	13.2	10.5	18.9	14.9	3.45
07	5.43	4.34	4.47	3.57	6.39	5.10	3.48
08	6.59	5.30	5.43	4.36	7.75	6.23	< LQ
09	4.37	3.55	3.60	2.93	5.14	4.18	6.03
10	3.71	3.33	3.06	2.74	4.37	3.92	< LQ
11	nd	nd	nd	nd	nd	nd	< LQ
12	4.11	3.16	3.38	2.60	4.83	3.72	4.64
13	24.6	18.9	20.3	15.5	28.9	22.2	3.43
14	41.8	32.4	34.4	26.7	49.2	38.1	7.97
15	22.8	17.6	18.8	14.5	26.8	20.6	3.81