 鲜花( 13)  鸡蛋( 1)
|
Human Health Risk Assessment of Mercury in Fish March 2007; _; m" R* K& f4 d
and Health Benefits of Fish Consumption) G% K( @/ Z T0 I7 S! n: J6 L
With respect to the types of mercury found in fish, both inorganic and organic mercury may be1 K7 T$ K u, }5 F
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical1 H7 J, h: J6 ^
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
P4 u/ o! b& o( `$ i) U2 yproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
/ I! x$ s4 {1 X# [$ i: Zlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to7 u( {" ]! j% Z# t
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other1 R) B+ q- b- G! u5 W6 P7 N
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
/ d. V+ g$ o* Y3 ]2 S" @' Qlesser extent than methyl mercury.
) j5 J3 F5 h$ R2 x- IAPPENDIX I7 j0 m' e3 q; T( f. c# v/ v
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
3 U; @ N2 v, e- K7 P9 d(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.+ h1 i% a) `- k; n# {. u
Samples were collected at the importers= or at domestic processing plants during the periods April 1,( b0 _0 z: }: L+ f& m( B4 Z
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A( B3 `$ d# o% O; q1 J" l
concentration of zero indicates that mercury was not detected above the analytical detection limit.8 |6 [ r: N( x( ~# W+ a
Total Mercury Concentration
, T8 X* J# y K( Y1 V( |(ppm)
! B' ?4 L6 J/ m( E; S gSpecies
) Q' l+ x' L2 k0 ~) j1 sNo. of0 ^! q2 z0 T M/ ]7 j: X
samples
$ ^: C! ~6 n+ u7 O% k, y# f9 e* ~2 b0 E8 M( X(N) Mean Median Min Max
) s' ?9 B& V# B( iAmberjacks 3 0.17 0.14 0.11 0.27
: ^( ` ?& P/ O/ O A; VBarracouta 1 0.06 0.06 0.06 0.06
* y6 |! {' y' d$ s& |( }Basa 5 0.02 0.02 0.02 0.02( Y z' Q: G) i* u' g
Bullhead, Brown 2 0.09 0.09 0.07 0.1) Y; y N9 E- S, L+ @) P+ _9 v& |
Capelin 4 0.02 0.02 0 0.059 N5 f& f+ u) `2 m
Carp 1 0.1 0.1 0.1 0.19 U6 o* w8 @/ m8 S1 n# S
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
, ^6 u' m4 u$ o) RChar, Arctic 5 0.09 0.10 0.05 0.054 I6 {/ M; ]7 K; g1 x- A6 x
Clam (various species) 40 0.03 0.01 0 0.08
1 Q6 N1 {& Y1 n K+ L1 O- V, r1 VCockle, Greenland 1 0.05 0.05 0.05 0.05
& }; W7 M s3 v2 p* q. I9 fCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
7 \; ]# H- K( C6 S( f( V. oCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
, C) p) y0 n6 U3 @6 \( ]/ hCrawfish 1 0.1 0.1 0.1 0.18 K# |. j2 @. c r! P0 Y4 R% {; o3 q0 b
Drum, Freshwater 2 0.22 0.22 0.03 0.4$ t# {9 F' C8 J
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
2 Z; B7 y9 A( U5 x" j+ W- bEel (species not specified) 107 0.24 0.16 0.01 1.70% R. N5 B: A% Z
Flounder (various species) 22 0.06 0.06 0.03 0.129 ^& b4 t& F5 d0 [- y4 H9 t
Haddock 3 0.05 0.05 0.03 0.07 |
|