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Human Health Risk Assessment of Mercury in Fish March 2007; f R& B) Q2 S3 T% w2 \9 w
and Health Benefits of Fish Consumption6 A y% Z& F. x
With respect to the types of mercury found in fish, both inorganic and organic mercury may be7 q+ U# @$ @" [
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical* }% P: }( q9 h- B- v9 E, }
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
! G% P2 l( h/ {; Pproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury+ T. i, S7 _" L/ c8 V
level increasing with age of the fish. In turn, bio magnification along the food chain leads to- f0 ~ S( W5 H
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other! v! W! H3 Y) N- o. H" a0 L9 K8 a
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far$ [; q8 m, d6 {9 H
lesser extent than methyl mercury.% h5 K* c" k A& s0 \
APPENDIX I/ k+ o8 [2 o* C* Z6 q
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency$ G6 q% C( J" a9 M j8 R
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
f; P. z, a9 U, u+ s7 P0 ^6 dSamples were collected at the importers= or at domestic processing plants during the periods April 1,
# K3 ]1 R! R2 ^* v! K9 l4 a2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
F1 A3 E& {5 `2 zconcentration of zero indicates that mercury was not detected above the analytical detection limit.
) K! ?8 e5 P' dTotal Mercury Concentration
% t. F+ q) N1 |1 \! z(ppm), q3 h& E6 B. e, U% ^/ _# m/ w
Species% v/ K1 S- ?) C( x
No. of" W1 \; R1 N8 C# M
samples6 F) d, g. K+ s: p0 p( l" p- a
(N) Mean Median Min Max
* I$ p+ q: d X4 C/ {Amberjacks 3 0.17 0.14 0.11 0.27
: [, L5 i1 T* g% h) U9 c( P; JBarracouta 1 0.06 0.06 0.06 0.06* q! }+ N v) w [+ g- C# A" } f
Basa 5 0.02 0.02 0.02 0.02
$ t* j9 l( N! D. N0 E) {Bullhead, Brown 2 0.09 0.09 0.07 0.16 B- M# b- @1 o# K8 `
Capelin 4 0.02 0.02 0 0.05
0 B3 Y5 \$ O- w7 G+ B/ k3 eCarp 1 0.1 0.1 0.1 0.1+ @ A4 K( j6 I3 b, l
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
& V# g6 A. y( l& c6 s5 {Char, Arctic 5 0.09 0.10 0.05 0.05' p4 G, o/ w8 \( `6 V
Clam (various species) 40 0.03 0.01 0 0.08( i6 y& z+ g' Y3 q4 Z# \/ ?6 _
Cockle, Greenland 1 0.05 0.05 0.05 0.05# [( x! a0 f' j5 o0 u* j
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
+ ^, W6 j8 L [' `4 jCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
! X( P5 J5 _* |" H* pCrawfish 1 0.1 0.1 0.1 0.1
1 t( n1 J/ n. p4 H' i. uDrum, Freshwater 2 0.22 0.22 0.03 0.4
2 `8 g+ `) G+ ~; MEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.760 L0 }) e, V+ N) H- l2 j; f
Eel (species not specified) 107 0.24 0.16 0.01 1.70
1 ?' N/ C3 I: s/ O& M( D1 iFlounder (various species) 22 0.06 0.06 0.03 0.12- O% C" s5 t. N R0 O
Haddock 3 0.05 0.05 0.03 0.07 |
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发表于 2012-10-27 10:21
