154
Fish
(6) minimize analyst's time requirements to permit analyses of large numbers of
samples.
In this procedure, the fish samples (spiked with an isotopic marker compound) are
processed as shown in Fig. 7.4. Table 7.l3 shows some recovery data obtained by this
procedure for various polychlorinated-dibenzo-p-dioxins (PCDD) and polychlorinated dibenzo furans (PCDF) spiked into fish samples. These results demonstrate the
effectiveness of recovery of a large proportion of these compounds, especially those
tetra-, penta-, and hexachloro isomers possessing the critical 2,3,7,8 chlorine substitution pattern (Column (a), Table 7.13). The reduced precision for tetrachloro-dibenzoTable 7.14
Results of interlaboratory studies and comparisons of the determination of 2,3,7,8TCDD in fish and birds (from [463])
Levels of 2, 3, 7, 8-TCDD reported (pg/ g) at different laboratories
Study
reported
number
CNFRL
no. 1
no. 2
no. 3
no. 4
no. 5
no. 6
no. 7
av
USFDA
sample 1
9
6
5
sample 2
47
67
77
89
67
sample 3
22
25
57
42
34
sample 4
117
113
128
99
188
sample 5
56
45
38
53
sample 6
96
100
107
199
178
b
H &WC/USFDA
sample 7
58
104
58
49,58
<5
72
70
60
61
sample 8
<1
<10
<1
<2,<2 <5
<2
<5
37
3.6
sample 9
34
35
37
23,32
51
25
33
26
30
sample 10
38
45
33
19,31
55
32
27
32
32
USEPA
sample 11
37
52
45
55
sample 12
36
39
sample 13
19
15
25
sample 14
< 1
<9
<5
< 25
Independent Laboratories
Swiss
Nat Center
CNFRL
Fed Res'
Tox Res b
Carp, Lake Huron
22,27
29
10
Carp, Lake Erie
<1
5
<10
Lake trout, Lake Ontario
56,58
54
Ocean herring, control
<1
<10
Lake trout, Lake Huron
39
32
R. b. trout, Lake Ontario
38
31
Carp, Saginaw Bay
94
75
Carp, Tittabawassee R., MI
81
65
• = analysed by HRGC / high resolution electron impact mass spectrometry
b = analysed by HRGC / chemical ionization atmosphere pressure mass spectrometry
USFDA = US Food and Drug Administration
HRWC = Health and Welfare, Canada
CNFRL = Colombia National Fisheries Research Laboratory USA
Fish
(6) minimize analyst's time requirements to permit analyses of large numbers of
samples.
In this procedure, the fish samples (spiked with an isotopic marker compound) are
processed as shown in Fig. 7.4. Table 7.l3 shows some recovery data obtained by this
procedure for various polychlorinated-dibenzo-p-dioxins (PCDD) and polychlorinated dibenzo furans (PCDF) spiked into fish samples. These results demonstrate the
effectiveness of recovery of a large proportion of these compounds, especially those
tetra-, penta-, and hexachloro isomers possessing the critical 2,3,7,8 chlorine substitution pattern (Column (a), Table 7.13). The reduced precision for tetrachloro-dibenzoTable 7.14
Results of interlaboratory studies and comparisons of the determination of 2,3,7,8TCDD in fish and birds (from [463])
Levels of 2, 3, 7, 8-TCDD reported (pg/ g) at different laboratories
Study
reported
number
CNFRL
no. 1
no. 2
no. 3
no. 4
no. 5
no. 6
no. 7
av
USFDA
sample 1
9
6
5
sample 2
47
67
77
89
67
sample 3
22
25
57
42
34
sample 4
117
113
128
99
188
sample 5
56
45
38
53
sample 6
96
100
107
199
178
b
H &WC/USFDA
sample 7
58
104
58
49,58
<5
72
70
60
61
sample 8
<1
<10
<1
<2,<2 <5
<2
<5
37
3.6
sample 9
34
35
37
23,32
51
25
33
26
30
sample 10
38
45
33
19,31
55
32
27
32
32
USEPA
sample 11
37
52
45
55
sample 12
36
39
sample 13
19
15
25
sample 14
< 1
<9
<5
< 25
Independent Laboratories
Swiss
Nat Center
CNFRL
Fed Res'
Tox Res b
Carp, Lake Huron
22,27
29
10
Carp, Lake Erie
<1
5
<10
Lake trout, Lake Ontario
56,58
54
Ocean herring, control
<1
<10
Lake trout, Lake Huron
39
32
R. b. trout, Lake Ontario
38
31
Carp, Saginaw Bay
94
75
Carp, Tittabawassee R., MI
81
65
• = analysed by HRGC / high resolution electron impact mass spectrometry
b = analysed by HRGC / chemical ionization atmosphere pressure mass spectrometry
USFDA = US Food and Drug Administration
HRWC = Health and Welfare, Canada
CNFRL = Colombia National Fisheries Research Laboratory USA