 鲜花( 13)  鸡蛋( 1)
|
Human Health Risk Assessment of Mercury in Fish March 2007
8 B/ C2 v7 }" i( q9 c Dand Health Benefits of Fish Consumption( a; D# Z4 Q9 u$ }0 S
With respect to the types of mercury found in fish, both inorganic and organic mercury may be
0 p: U p3 y2 t4 K2 V4 Ypresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
& b4 Y) d$ O2 Q6 u+ n- q" mproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the6 G I+ V9 b# u! C
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury/ s& Z, E. B3 U, Z2 z- x7 Y8 C
level increasing with age of the fish. In turn, bio magnification along the food chain leads to# U9 d8 M$ b7 B! `
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
$ O g S9 G' ~7 V! Torganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
6 v. c Y) V" g6 I Y+ {: D7 Blesser extent than methyl mercury.8 e# R! D E6 Q/ x5 q; K( h" o; h
APPENDIX I
+ }5 o: c; E. C7 I3 h6 H& USummary data for those samples of fish that were found by the Canadian Food Inspection Agency
1 Q4 `; Y5 |% W1 N(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
" |% ?' {2 L0 n* _; `$ q. i7 [Samples were collected at the importers= or at domestic processing plants during the periods April 1,3 |, c1 ~& Q3 q) S& x! e' d
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
u8 N; n: a2 T# V/ B& B# V4 lconcentration of zero indicates that mercury was not detected above the analytical detection limit.
8 N+ j$ f" R' f1 a* O2 G vTotal Mercury Concentration
6 P8 K' s j0 Y/ x' n% \: p(ppm)
# C- a7 n5 _# OSpecies2 d! q1 i, G% c3 j. n# U/ E
No. of$ h1 n5 D8 l( @4 |0 b
samples
, H w# ?7 t8 D8 I! M(N) Mean Median Min Max$ ], P' E1 m* \' h4 z- _( w
Amberjacks 3 0.17 0.14 0.11 0.27* Z$ G# m! X" Y& m! N* m
Barracouta 1 0.06 0.06 0.06 0.066 m7 w o8 O- r# E
Basa 5 0.02 0.02 0.02 0.02
$ v& Q0 C2 w$ J8 [Bullhead, Brown 2 0.09 0.09 0.07 0.1; k' W' K1 T' [( Y" c. C9 u% L5 w
Capelin 4 0.02 0.02 0 0.05
7 P: K8 p2 M0 E9 rCarp 1 0.1 0.1 0.1 0.1
( \) }& F) V( Z& kCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
1 e. ^. X, \8 a; fChar, Arctic 5 0.09 0.10 0.05 0.05; O4 _/ h4 a( B- H1 }
Clam (various species) 40 0.03 0.01 0 0.08
3 k: |4 ~# I; E) z. k0 TCockle, Greenland 1 0.05 0.05 0.05 0.05* n5 ^( }: E7 K8 k
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
0 y5 ^! _- ?; ^" l, q6 s# @Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
. A% L& T1 _ [( e6 u0 q' E( {Crawfish 1 0.1 0.1 0.1 0.16 ]6 p: ]( i! u9 v$ d# q
Drum, Freshwater 2 0.22 0.22 0.03 0.4
( f; D. c4 r- D) |$ t; M0 mEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.769 b- C6 L/ x/ I" Q; L5 k8 ]
Eel (species not specified) 107 0.24 0.16 0.01 1.703 I+ u/ b2 j$ ^/ q7 ?, {
Flounder (various species) 22 0.06 0.06 0.03 0.12( E/ X% t' g+ V/ v7 E$ d
Haddock 3 0.05 0.05 0.03 0.07 |
|