 鲜花( 13)  鸡蛋( 1)
|
Human Health Risk Assessment of Mercury in Fish March 2007
" p" E% r# H5 y0 i& Iand Health Benefits of Fish Consumption
* r2 Q3 k+ N# N$ d% }7 F' t0 g( ~With respect to the types of mercury found in fish, both inorganic and organic mercury may be; {0 T6 X% S2 G! m5 s- E: M
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical/ Q- s; ^- c% v( y4 n+ f3 ^! L w
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the/ J! J- N! T, }+ U2 w
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
( T2 g6 s( I7 N+ b+ x; c' h" ~level increasing with age of the fish. In turn, bio magnification along the food chain leads to5 @. @, r: [- J* B n/ T& @& g2 @7 R
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
: n" p4 d3 m& m! f$ [organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
6 K2 X- B! _& x8 C+ j/ Glesser extent than methyl mercury.
, y, Y' J9 W! t) ?3 i8 eAPPENDIX I. B7 Q$ t) X5 ]# N; C5 S
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
1 h, P+ G# |4 z- F* G& p# z(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.5 C& P" `' S, e7 S
Samples were collected at the importers= or at domestic processing plants during the periods April 1,1 S3 }2 v) T J, w, N2 O
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
8 j. |9 `. S" j3 C3 ]concentration of zero indicates that mercury was not detected above the analytical detection limit.
( E x* k$ K5 T2 w% R5 PTotal Mercury Concentration
7 f, z( `* ^1 O2 ^3 D. Q(ppm)
0 u9 M! H1 g" C3 y! F+ kSpecies
1 k/ i. C: h4 L3 x% D$ XNo. of% q' V% R2 A2 `) K# \* b M' B
samples
i2 o s. b2 A(N) Mean Median Min Max
) Y! |/ o& o6 c% W# G( X- ~. E- gAmberjacks 3 0.17 0.14 0.11 0.27
6 A) V# V5 R3 g2 R9 H1 L, XBarracouta 1 0.06 0.06 0.06 0.06
0 A B: [3 B c& A+ ^( L" UBasa 5 0.02 0.02 0.02 0.02
, J/ l6 L2 n. tBullhead, Brown 2 0.09 0.09 0.07 0.1
, T$ l6 f" g6 R6 aCapelin 4 0.02 0.02 0 0.05
. T6 s( R0 ?7 xCarp 1 0.1 0.1 0.1 0.1
+ T' g1 w8 x$ I" _3 G5 x" sCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.370 ?) }6 H$ f3 M, l4 M( p/ ~
Char, Arctic 5 0.09 0.10 0.05 0.05
" C$ }+ X+ a9 J. o/ a; l4 KClam (various species) 40 0.03 0.01 0 0.08% \" @' ^8 J2 _2 p! Y
Cockle, Greenland 1 0.05 0.05 0.05 0.05
) k5 Q' C4 M# h3 FCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
0 { _, V* n' MCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
) d2 S7 f! W) s* g8 G! ?8 p! ^Crawfish 1 0.1 0.1 0.1 0.1* O3 S: a! x- S5 y: z
Drum, Freshwater 2 0.22 0.22 0.03 0.4' z# C) }0 b: K8 l" q6 c( d0 q b9 g
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
" D8 M+ I' e8 W# W- M' b0 ^3 NEel (species not specified) 107 0.24 0.16 0.01 1.70
0 |" ?/ n% e [& cFlounder (various species) 22 0.06 0.06 0.03 0.12
/ R) l* v, T* |3 F& N+ wHaddock 3 0.05 0.05 0.03 0.07 |
|