 鲜花( 13)  鸡蛋( 1)
|
Human Health Risk Assessment of Mercury in Fish March 2007( t2 ]8 H& C! L0 b2 Q
and Health Benefits of Fish Consumption: R I9 E9 t: @9 c) x* t6 e7 e
With respect to the types of mercury found in fish, both inorganic and organic mercury may be: R% H! p( M ~% c' L: r
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
, W+ i5 f* \9 w3 Q* T/ W+ Xproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the) f2 d9 i) ^( x
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
: F4 F6 C2 d! I) X4 ^& _- A# Dlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to9 L# [7 }/ t( F1 c% J+ P
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
- o" y p8 |4 `- u, ] z$ [. {organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
9 q: y3 T& l, D7 D0 H$ Y" [& [lesser extent than methyl mercury.
5 R6 }& P# P! MAPPENDIX I2 k3 I, B& G8 W# C& |6 J; @$ T
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency2 \. ~% G: E8 ]& ]
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
" g! p7 a2 J0 D* X: |, ?Samples were collected at the importers= or at domestic processing plants during the periods April 1,
" F, {4 w7 i6 y1 U' E1 ^' B2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
) ~. h7 t) B3 h; a+ B+ oconcentration of zero indicates that mercury was not detected above the analytical detection limit.
5 Y. l; E: M8 r: [4 f* Y* h8 MTotal Mercury Concentration
/ Z# I9 d6 |# D8 Y* Z5 I(ppm)- p3 V# i2 r. V. z0 S6 \0 F
Species0 a$ X5 \% f2 _4 Z3 ^
No. of
/ M ]! E/ o' E& \9 }samples
# I, Z" t) x( e& A! [7 I1 ]+ s(N) Mean Median Min Max
- \2 H" M. d* m" I5 P, TAmberjacks 3 0.17 0.14 0.11 0.27
$ J; b$ [5 Z0 J1 vBarracouta 1 0.06 0.06 0.06 0.06) V5 R, E* @( n5 \) L
Basa 5 0.02 0.02 0.02 0.02$ X }& A8 o1 S0 |% l! t' L9 a1 h( r' a
Bullhead, Brown 2 0.09 0.09 0.07 0.14 ?4 ?/ h! ?0 K+ ]+ h) |
Capelin 4 0.02 0.02 0 0.05
. m5 Z' {' P8 {Carp 1 0.1 0.1 0.1 0.1
) }7 f; i0 ~5 s; [# RCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
+ W& K, U$ X1 u0 d7 IChar, Arctic 5 0.09 0.10 0.05 0.05/ C3 B* X6 a% @3 T
Clam (various species) 40 0.03 0.01 0 0.08
5 ^" U8 H7 k4 A1 aCockle, Greenland 1 0.05 0.05 0.05 0.05 B+ U. d7 H8 q- |- j, ]+ M6 K, z
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.283 v9 g* k6 }* G& \5 ~- ^
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
- {- Z! g$ m( ICrawfish 1 0.1 0.1 0.1 0.1* p/ f$ s0 S k( Y
Drum, Freshwater 2 0.22 0.22 0.03 0.4
( G4 L! I { `- Q& F( ?# J. DEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.766 n* Y; Q u. I. g+ s
Eel (species not specified) 107 0.24 0.16 0.01 1.70
3 ? f' b7 E8 y4 |Flounder (various species) 22 0.06 0.06 0.03 0.12
( B' g: g/ ~6 C, z- XHaddock 3 0.05 0.05 0.03 0.07 |
|