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Human Health Risk Assessment of Mercury in Fish March 20077 f3 W7 O" r! R1 d4 `; ?
and Health Benefits of Fish Consumption5 M; K5 ~4 H' r6 j: O8 V" c0 B _9 H
With respect to the types of mercury found in fish, both inorganic and organic mercury may be/ [( K2 Z& D3 u: v7 k- X
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical# c" M" O7 p W2 ^* G4 V
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
9 g& h3 b& f; \6 `: E! rproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
* ~4 l5 |0 N! Z% u/ mlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to0 Z+ @) W8 A5 L. Y# H
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
0 Q* b5 P( t# k0 N K6 \( _organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far' s/ I) F& w5 T6 e4 H
lesser extent than methyl mercury.% q% Z) B3 ~+ ]
APPENDIX I: A! X4 N' z; \2 d- i+ B0 h2 q1 G
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency3 D6 k& b6 K( B! m/ b7 G% q
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
+ i9 v" d3 R3 \' WSamples were collected at the importers= or at domestic processing plants during the periods April 1,6 K% N' f6 E6 v8 [
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A2 ^! Z4 F9 i' C
concentration of zero indicates that mercury was not detected above the analytical detection limit.8 U; S4 F, \4 F
Total Mercury Concentration1 ^( h- Z# C+ w, d3 i
(ppm)4 ^5 K C- T' |7 n+ ] i g
Species8 L0 ` k4 D& X& D' U
No. of
J w2 i7 Z4 tsamples6 C8 u& c _8 J8 I6 _" q
(N) Mean Median Min Max
! ^4 D3 v( u1 {7 B! w+ d( P YAmberjacks 3 0.17 0.14 0.11 0.27. ?2 v; \, F, s$ r8 r
Barracouta 1 0.06 0.06 0.06 0.06# y, z. S; |3 U2 [& B9 T* U; f6 H
Basa 5 0.02 0.02 0.02 0.028 v. d# I" r9 ]* r* k
Bullhead, Brown 2 0.09 0.09 0.07 0.12 L' M& j6 y! C% A, H
Capelin 4 0.02 0.02 0 0.05
" L$ k% i( c' o- k) S' h& d* A YCarp 1 0.1 0.1 0.1 0.1% G) F) ?5 @# \+ u3 q
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
/ k7 i( M0 f' N5 ^) @$ S) CChar, Arctic 5 0.09 0.10 0.05 0.056 w1 M0 ]9 B7 y, F/ o- |
Clam (various species) 40 0.03 0.01 0 0.08' a6 o9 K' `# s6 Z9 m6 X
Cockle, Greenland 1 0.05 0.05 0.05 0.05
+ N4 O: d- F2 sCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
5 F; Z! B. t+ ?% j' y0 o3 H( OCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37* E, {+ m Q+ q$ ~, L( f* T# ~
Crawfish 1 0.1 0.1 0.1 0.1( T' K. T8 d) e, p0 Y. a
Drum, Freshwater 2 0.22 0.22 0.03 0.47 M3 Y+ i1 Z$ z4 c
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76( o1 e1 S2 J7 O
Eel (species not specified) 107 0.24 0.16 0.01 1.702 Q- h9 R1 c6 H/ u0 r1 e$ s
Flounder (various species) 22 0.06 0.06 0.03 0.12+ @! q6 x6 h- \& Y8 A
Haddock 3 0.05 0.05 0.03 0.07 |
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发表于 2012-10-27 10:21
