Table 3.

Validation of the analytical procedure using SRM 1946

PCB congener	Certified/reference concentration (ng/g ww)	Obtained concentration (ng/g ww)	% Recovery
Certified mass fraction
52	8.1	6.763 ± 1.3	83.2
77	0.327	0.271 ± 0.04	82.9
101	34.6	30.97 ± 0.32	89.5
118	52.1	45.82 ± 1.53	87.9
126	0.38	0.310 ± 0.07	81.6
138	115	101.7 ± 11.6	88.4
153	170	154.4 ± 8.71	90.8
156	9.52	7.635 ± 0.54	80.2
169	0.106	0.088 ± 0.04	83.2
180	74.4	61.75 ± 3.27	83.0
Reference mass fraction
28	2	1.69 ± 0.15	84.7