TABLE 2.

Changes in PCB congeners of Aroclor 1260 after 181 days of incubation^a

DB-1 peak no.	PCB congener(s)	Mol% of total PCBs
		Aroclor 1260 at 0 day	After 181 days
			Aroclor 1260	Aroclor 1260 + 2,3,4,5-CB	Aroclor 1260 + 2,3,5,6-CB
7	2-3-		0.01 ± 0.02	0.97 ± 0.69
8	2,3-; 2-4-	0.10 ± 0.00	0.18 ± 0.01	0.32 ± 0.01	0.30 ± 0.02
10	2,6-2-		0.04 ± 0.01	0.08 ± 0.06
12	3-3-			0.99 ± 0.08	0.12 ± 0.17
13	3,4-; 3-4-			1.80 ± 0.13	0.56 ± 0.37
14	2,5-2-	0.14 ± 0.00	0.49 ± 0.05	1.13 ± 0.02	1.23 ± 0.18
15	2,4-2-	0.05 ± 0.00	0.17 ± 0.02	0.44 ± 0.02	0.37 ± 0.07
17	2,3-2-; 2,6-4-	0.06 ± 0.00	1.02 ± 0.17	1.07 ± 0.19	0.50 ± 0.18
19	2,6-2,6-		1.68 ± 0.31	1.51 ± 0.37
21	2,5-3-		0.11 ± 0.02	2.83 ± 0.19	0.80 ± 0.26
22	2,4-3-		0.13 ± 0.06	6.96 ± 0.16	1.52 ± 0.38
23	2,5-4-	0.16 ± 0.00	0.29 ± 0.02	0.67 ± 0.03	0.51 ± 0.08
24	2,4-4-	0.10 ± 0.00	1.13 ± 0.14	1.03 ± 0.08	0.55 ± 0.11
25	2,5-2,6-	0.08 ± 0.00	3.06 ± 0.21	4.01 ± 0.20	3.07 ± 0.35
26	2,4-2,6-		9.13 ± 0.63	10.17 ± 0.77	4.77 ± 2.15
28	3,5-3-			0.36 ± 0.05	0.11 ± 0.02
29	2,3-2,6-		0.11 ± 0.00	0.11 ± 0.01	0.15 ± 0.02
30	3,5-4-		0.37 ± 0.09	—c	0.06 ± 0.01
31	2,5-2,5-	0.58 ± 0.01	1.30 ± 0.07	2.21 ± 0.06	5.08 ± 0.28
32	2,4-2,5-	0.08 ± 0.00	7.92 ± 0.58	11.05 ± 0.17	14.50 ± 0.16
33	2,4-2,4-		20.11 ± 1.96	25.65 ± 0.85	24.51 ± 0.97
37	2,4,6-2,6-; 2,3-2,5-	0.04 ± 0.00	0.44 ± 0.08	1.62 ± 0.17	0.77 ± 0.15
38	2,3-2,4-		0.16 ± 0.01	0.19 ± 0.08	0.54 ± 0.09
39	2,5-3,5-b; 2,3,6-4-	0.14 ± 0.00	2.25 ± 0.12	1.92 ± 0.08	1.86 ± 0.18
40	2,4-3,5-		6.21 ± 0.98	2.45 ± 0.12	3.32 ± 0.19
43	2,4,6-2,5-		1.05 ± 0.11	1.50 ± 0.03	1.42 ± 0.05
44	2,4,6-2,4-		3.81 ± 0.63	5.23 ± 0.46	2.60 ± 0.60
46	2,3,5-2,6-		0.74 ± 0.09		0.01 ± 0.01
47	2,5-3,4-	0.06 ± 0.04	0.35 ± 0.08		1.54 ± 0.18
48	2,4-3,4-b; 2,3,6-2,5-	3.32 ± 0.05	0.87 ± 0.20	0.70 ± 0.05	3.54 ± 0.86
49	2,3,6-2,4-		1.08 ± 0.02	0.49 ± 0.10	0.70 ± 0.06
50	2,3-3,4-; 2,3,4-4-	0.18 ± 0.00
51	2,3,6-2,3-; 2,3,5-2,5	0.32 ± 0.00	0.11 ± 0.01	0.08 ± 0.01	0.08 ± 0.01
53	2,4,5-2,5-; 2,3,5-2,4-	4.09 ± 0.17	0.94 ± 0.21	0.20 ± 0.02	0.38 ± 0.03
54	2,4,5-2,4-	0.13 ± 0.09	1.25 ± 0.09	0.47 ± 0.03	0.74 ± 0.05
55	2,4,6-3,4-; 2,3,6-2,4,6-		1.07 ± 0.05	1.43 ± 0.21	1.96 ± 0.13
57	2,4,5-2,3-	0.13 ± 0.00	0.20 ± 0.02	0.05 ± 0.01	0.05 ± 0.01
58	2,3,4-2,5-	0.35 ± 0.01	0.03 ± 0.00
60	2,3,6-2,3,6-	1.65 ± 0.01	0.52 ± 0.21	0.77 ± 0.33	2.60 ± 0.49
61	2,3,6-3,4-	1.72 ± 0.02	0.35 ± 0.06
62	2,4,5-2,4,6-		0.33 ± 0.05	0.58 ± 0.29	1.93 ± 0.43
64	2,3,5,6-2,5-	3.47 ± 0.03	0.69 ± 0.14	0.13 ± 0.03	0.23 ± 0.05
65	2,3,5-2,3,6-	1.07 ± 0.01	0.34 ± 0.08	0.08 ± 0.02	0.13 ± 0.04
66	2,3,4,6-2,5-	0.57 ± 0.01
69	2,4,5-3,4-; 2,3,6-2,4,5-	9.90 ± 0.04	2.23 ± 0.54	0.68 ± 0.37	5.34 ± 1.46
71	2,3,5,6-2,3-	0.37 ± 0.00	0.05 ± 0.01	0.01 ± 0.00	0.02 ± 0.00
72	2,3,4,6-2,3-; 2,3,5-2,3,5-	0.14 ± 0.00	0.08 ± 0.01	0.02 ± 0.00	0.02 ± 0.00
73	2,3,5-2,4,5-	1.33 ± 0.01	0.64 ± 0.10	0.27 ± 0.03	0.37 ± 0.04
74	2,3,4-3,4-; 2,3,4-2,3,6-	3.28 ± 0.00	0.47 ± 0.10	0.08 ± 0.02	0.12 ± 0.03
75	2,4,5-2,4,5-	9.74 ± 0.01	2.85 ± 0.59	0.73 ± 0.15	1.31 ± 0.22
77	2,3,4,5-2,5-	2.90 ± 0.03	0.60 ± 0.11	0.07 ± 0.04	0.13 ± 0.05
78	2,3,5,6-2,3,6-	2.00 ± 0.03	0.83 ± 0.18	0.28 ± 0.04	0.40 ± 0.07
80	2,3,4,5-2,4-; 2,3,4-2,3,5-; 2,3,4,6-2,3,6-	0.87 ± 0.00	0.23 ± 0.05	0.05 ± 0.01	0.09 ± 0.02
82	2,3,4-2,4,5-; 2,3,5,6-3,4-; 2,3,6-3,4,5-	9.94 ± 0.03	2.65 ± 0.51	0.61 ± 0.17	0.93 ± 0.19
83	2,3,4,6-3,4-	0.23 ± 0.00	0.05 ± 0.01
85	2,3,5,6-2,3,5-	0.69 ± 0.01	0.20 ± 0.04	0.03 ± 0.01	0.05 ± 0.01
87	2,3,4,6-2,3,5-	0.18 ± 0.01	0.08 ± 0.01	0.01 ± 0.00	0.03 ± 0.01
88	2,3,5,6-2,4,5-	5.15 ± 0.04	2.01 ± 0.36	0.50 ± 0.12	0.75 ± 0.17
90	2,3,4,6-2,4,5-	2.00 ± 0.02	0.65 ± 0.12	0.13 ± 0.03	0.22 ± 0.05
91	2,4,5-3,4,5-	0.93 ± 0.06	0.52 ± 0.19	0.10 ± 0.03	0.14 ± 0.03
92	2,3,4,5,6-2,5-	0.53 ± 0.00	0.18 ± 0.03	0.04 ± 0.01	0.07 ± 0.01
93	2,3,4,5-2,3,6-	4.94 ± 0.01	1.81 ± 0.33	0.68 ± 0.31	0.70 ± 0.14
94	2,3,5,6-2,3,4	2.39 ± 0.01	0.81 ± 0.16	0.19 ± 0.05	0.29 ± 0.06
95	2,3,4,5-3,4-; 2,3,4,6-2,3,4-	1.82 ± 0.06	0.71 ± 0.12	0.20 ± 0.05	0.12 ± 0.03
96	2,3,4-3,4,5-; 2,3,5,6-2,3,5,6-	0.32 ± 0.01	0.12 ± 0.02		0.04 ± 0.03
99	2,3,4,6-2,3,5,6-	0.10 ± 0.01	0.06 ± 0.01	0.02 ± 0.01	0.03 ± 0.01
100	2,3,4,5-2,3,5-	0.72 ± 0.00	0.33 ± 0.05	0.10 ± 0.03	0.15 ± 0.03
102	2,3,4,5-2,4,5-	9.98 ± 0.06	4.87 ± 0.82	1.32 ± 0.32	2.03 ± 0.40
103	2,3,5,6-3,4,5-	0.48 ± 0.01	0.35 ± 0.04	0.13 ± 0.01	0.18 ± 0.05
104	2,3,4,6-3,4,5-	0.20 ± 0.00	0.06 ± 0.01	0.02 ± 0.01	0.03 ± 0.00
105	2,3,4,5,6-2,3,6-	0.30 ± 0.02	0.10 ± 0.01	0.05 ± 0.01	0.06 ± 0.01
106	2,3,4,5-2,3,4-	3.72 ± 0.02	1.55 ± 0.25	0.48 ± 0.10	0.68 ± 0.14
107	2,3,4,5,6-3,4-	0.67 ± 0.02	0.54 ± 0.09	0.18 ± 0.04	0.25 ± 0.04
109	2,3,4,5-2,3,5,6-	1.50 ± 0.01	0.92 ± 0.12	0.30 ± 0.07	0.43 ± 0.08
110	2,3,4,5-2,3,4,6-; 2,3,4,5,6-2,4,5-	1.35 ± 0.05	0.89 ± 0.11	0.21 ± 0.06	0.31 ± 0.07
111	2,3,4,5-3,4,5-	0.20 ± 0.00	0.13 ± 0.01	0.05 ± 0.01	0.07 ± 0.01
112	2,3,4,5,6-2,3,4-	0.64 ± 0.00	0.50 ± 0.05	0.19 ± 0.03	0.27 ± 0.03
113	2,3,4,5,6-2,3,5,6-	0.16 ± 0.00	0.02 ± 0.00	0.01 ± 0.00	0.01 ± 0.00
115	2,3,4,5-2,3,4,5-	1.26 ± 0.04	1.30 ± 0.07	0.61 ± 0.09	0.81 ± 0.08
117	2,3,4,5,6-2,3,4,5-	0.48 ± 0.01	0.49 ± 0.01	0.40 ± 0.02	0.44 ± 0.01

^aAll data are the means of triplicates ± standard deviations. 

^bNot detected in Aroclor 1260 (16, 17). 

^c3,5-4-CB was detected at 0.2 mol% after 2 to 4 months of incubation.