 鲜花( 13)  鸡蛋( 1)
|
Human Health Risk Assessment of Mercury in Fish March 2007+ ?% Z6 N9 N) U# P6 J
and Health Benefits of Fish Consumption2 o. n+ W/ S4 K" D
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
% s+ i$ h; O! S5 ]( y& C, D' p! tpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical% y' D0 q( e3 v$ P. ?
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the8 n8 I @0 q! t/ f7 [% e' Q% R* n8 Y
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury0 Y) x5 `) G, K, u9 H, U! ~8 a
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
" h7 E5 B! p. [1 f% o: xhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
, m5 H- G: t Q1 b; ?organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
2 Z3 `6 J- M/ T+ a6 h! clesser extent than methyl mercury.
* i" \4 c$ U+ V& \! f. F, u& uAPPENDIX I
9 Q' h5 n8 t' l _4 t$ X7 {1 OSummary data for those samples of fish that were found by the Canadian Food Inspection Agency( P5 M4 M, h, J# E, j
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
+ H( }+ R/ M. S; }& U- a: B2 CSamples were collected at the importers= or at domestic processing plants during the periods April 1,2 L- {6 t5 J( i7 s7 M% B$ a6 f
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A2 |3 b8 |: L0 a( a3 g$ x
concentration of zero indicates that mercury was not detected above the analytical detection limit.6 N* Z6 A4 e. A- w9 a
Total Mercury Concentration
9 c5 X. l2 ]; r(ppm)# v2 b: k! m! q5 B" W7 w7 e
Species1 }$ q" @* g; c" h9 N" o
No. of3 l4 x. S+ P! X
samples+ z7 ?8 b% `9 v' b& A9 L
(N) Mean Median Min Max% v; P) B- G ~ D+ t
Amberjacks 3 0.17 0.14 0.11 0.27
+ |; O5 @0 }$ P0 b8 ~. d9 o: kBarracouta 1 0.06 0.06 0.06 0.06
$ X1 S# M5 y) o: q; |) t4 t# r1 ]Basa 5 0.02 0.02 0.02 0.026 u$ t3 X* }8 T+ ?0 p$ o
Bullhead, Brown 2 0.09 0.09 0.07 0.1
0 p' j" Z& l+ x+ U p$ |Capelin 4 0.02 0.02 0 0.05
; E( O2 c( ?+ ]; _7 S, I. A/ NCarp 1 0.1 0.1 0.1 0.1
. o! `" @' W# H( M7 G2 ~9 aCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
5 F& S+ s2 D; g$ w. _2 CChar, Arctic 5 0.09 0.10 0.05 0.05) G9 o& [% H! r: K2 c3 m! q
Clam (various species) 40 0.03 0.01 0 0.08
- o+ @+ J3 u3 A( P" ]Cockle, Greenland 1 0.05 0.05 0.05 0.05" l/ c( j/ f8 ]) U
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
3 V* i' Z- s k! z: m8 tCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37) R2 t6 z- T; b' g# _% w
Crawfish 1 0.1 0.1 0.1 0.1
7 l. I7 k9 \7 e1 S( ~, ~Drum, Freshwater 2 0.22 0.22 0.03 0.4
8 a9 `: o: Y# ?6 V: V5 ZEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
- }3 x) J+ O+ r }) iEel (species not specified) 107 0.24 0.16 0.01 1.706 N4 A+ S3 O0 A# N* t9 u
Flounder (various species) 22 0.06 0.06 0.03 0.12) e% x! S c$ S1 H1 q
Haddock 3 0.05 0.05 0.03 0.07 |
|