. 2023 Jun 15;57(25):9385–9393. doi: 10.1021/acs.est.3c02309

Table 1. C_free (ng/L) in Control (Unamended), Biochar, Powdered Activated Carbon (PAC), and Granular Activated Carbon (GAC) Amended Palos Verde Shelf Superfund Site Sediment at Different Sampling Times.

Treatment	Day	o,p′-DDE	p,p′-DDE	o,p′-DDD	p,p′-DDD
Control	180	0.26 ± 0.06	1.33 ± 0.22	0.06 ± 0.03	0.15 ± 0.03
	365	0.22 ± 0.03	1.34 ± 0.15	0.07 ± 0.06	0.18 ± 0.08
Biochar	180	0.14 ± 0.03	0.91 ± 0.12	nd	0.11 ± 0.01
	365	0.04 ± 0.02	0.37 ± 0.07	nd	0.16 ± 0.18
PAC	180	nd	0.18 ± 0.08	nd	0.05 ± 0.01
	365	nd	nd	nd	nd
GAC	180	0.16 ± 0.14	0.87 ± 0.75	0.04 ± 0.03	0.11 ± 0.07
	365	0.14 ± 0.25	0.05 ± 0.04	0.07 ± 0.11	0.25 ± 0.39

Table 1. Cfree (ng/L) in Control (Unamended), Biochar, Powdered Activated Carbon (PAC), and Granular Activated Carbon (GAC) Amended Palos Verde Shelf Superfund Site Sediment at Different Sampling Times.