Table 3.

Aqueous concentrations (TWA), female and mixed animals, fresh weight, lipid content, uptake and depuration rate constants, and bioconcentration factors (BCF) with uncertainty (u)

Test	Test substance	TWA (ng L−1)	Sex	Mean Hyalella fresh weight (mg)	Mean lipid (%) ± SD (%)	k1 ± SE (L kg−1 d−1)	k1min (L kg−1 d−1)	k2 ± SE (d−1)	Log BCFss ± u (L kg−1)	Log BCFk ± u (L kg−1)	Log BCFkmin (L kg−1)
I	Hexachlorobenzene	580	Female	2.41	2.44 ± 0.78	2693 ± 367	2343	0.256 ± 0.039	4.21 ± 1.44	4.33 ± 1.65	4.28
I	Ortho-terphenyl	875	Female	2.41	2.44 ± 0.78	1746 ± 161	1601	0.310 ± 0.055	3.97 ± 1.33	4.06 ± 1.53	4.03
II	PCB153	21	Female	1.04	n.a.	13,121 ± 524	n.a.	0.049 ± 0.013	n.a.	5.43 ± 1.42*	n.a.
II	DB[a,h]anthracene	2	Female	1.04	n.a.	n.a.	n.a.	n.a.	3.86 ± 1.21*	n.a.	n.a.
III	Methoxychlor	28	Mixed	1.71	3.26 ± 0.39	2192 ± 357	1780	0.119 ± 0.025	4.09 ± 0.65	4.45 ± 1.08	4.36
III	Benzo(a)pyrene	4	Mixed	1.71	3.26 ± 0.39	4983 ± 403	n.a.	1.497 ± 0.040	3.65 ± 0.47	3.71 ± 0.54	n.a.
IV	1,2,3-trichlorobenzene	13,410	Female	1.50	1.82 ± 0.67	14 ± 4	9	1.471 ± 0.226	1.30 ± 0.51	1.42 ± 0.70	1.23
IV	2,4,5-trichlorphenol	19,550	Female	1.50	1.82 ± 0.67	63 ± 6	55	0.857 ± 0.209	2.17 ± 0.82	2.31 ± 1.04	2.25

BCF_ss, steady-state BCF; BCF_k, kinetic BCF; BCF_kmin, kinetic BCF following minimized design (BCF estimates normalized to 5% lipid content); TWA, time-weighted average concentrations in test solution; SD, standard deviation; SE, standard error; u, uncertainty; n.a., no data available; mean lipid content (n = 4–6) of samples collected at beginning and end of uptake period

*BCF values not lipid normalized