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Human Health Risk Assessment of Mercury in Fish March 2007. x1 M x+ v- F0 Q* v
and Health Benefits of Fish Consumption' ~8 [0 Q: ?* e' \
With respect to the types of mercury found in fish, both inorganic and organic mercury may be2 X3 J% v d/ N5 g$ h
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical% W. t5 O. P) d
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the! K/ j( O* t* T' g
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury/ u2 F& U7 w T
level increasing with age of the fish. In turn, bio magnification along the food chain leads to- n6 t8 A5 m* m! }& p" w- ~' G+ c) e
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other. y" R( E- E- r7 V
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far2 z) f6 W, ?+ R) N7 O3 W3 A
lesser extent than methyl mercury.
+ L) c- ^- F- P+ ^, o. oAPPENDIX I
2 A- n! r+ q W9 c0 W( ?; {Summary data for those samples of fish that were found by the Canadian Food Inspection Agency! x3 m+ m2 j& [1 ~
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
% T" c6 ^3 p9 _3 k( W$ KSamples were collected at the importers= or at domestic processing plants during the periods April 1,
; j4 C. y5 B5 p2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A) ?: W' t6 c; j1 a
concentration of zero indicates that mercury was not detected above the analytical detection limit.- ?5 |1 k c$ l( {2 `3 D" J
Total Mercury Concentration0 C8 s* }' N: O5 V, |' C
(ppm)
$ S" H2 |2 _& U* P, NSpecies. ~5 M- T; Y' S* i5 `
No. of
. n. T# K) `) e2 B$ B6 {, v, \samples
% T9 y8 `! } _1 }! O(N) Mean Median Min Max
9 ^4 g% n1 V6 O# Y: g7 E% ?Amberjacks 3 0.17 0.14 0.11 0.27
9 R" J+ r- _4 B, [) v# r+ W& T6 eBarracouta 1 0.06 0.06 0.06 0.06
5 |$ B% u4 t# eBasa 5 0.02 0.02 0.02 0.02
, _, _! o. I1 p% M5 C& N* JBullhead, Brown 2 0.09 0.09 0.07 0.19 t; T* P# n0 g1 u
Capelin 4 0.02 0.02 0 0.05
/ S6 Y1 d) O. p% p ?Carp 1 0.1 0.1 0.1 0.1
. g( l# h9 F2 Z4 f- v( xCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
# L' I& _. r3 a( h, L9 ~Char, Arctic 5 0.09 0.10 0.05 0.05
4 ?" `0 ?/ `. `3 ?7 b$ Q& R: v bClam (various species) 40 0.03 0.01 0 0.080 x5 ~$ r( |# b- }2 m
Cockle, Greenland 1 0.05 0.05 0.05 0.053 P: w! u# a$ D+ {( H1 R6 ^
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28& U; Q' M2 A7 j5 w. \
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37* K9 h( X. ~0 X3 h/ J+ z. @
Crawfish 1 0.1 0.1 0.1 0.1/ I. L! D7 P4 W
Drum, Freshwater 2 0.22 0.22 0.03 0.4
1 Z/ K7 s6 D! [, [8 m" UEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.760 \* Q! j1 ^+ Z: o# t" u: u
Eel (species not specified) 107 0.24 0.16 0.01 1.70
E7 c, t% D7 ~; OFlounder (various species) 22 0.06 0.06 0.03 0.12( ~* y; ]2 q- k |& Z3 y9 J
Haddock 3 0.05 0.05 0.03 0.07 |
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发表于 2012-10-27 10:21
