 鲜花( 13)  鸡蛋( 1)
|
Human Health Risk Assessment of Mercury in Fish March 2007
5 p3 S/ N9 _! B& `( Q! Nand Health Benefits of Fish Consumption* i5 ]( |2 H' ]$ M4 ]7 b- r5 f$ ~9 T
With respect to the types of mercury found in fish, both inorganic and organic mercury may be4 N. r$ @1 |" O3 P- z6 E
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical
+ w V# `2 f+ S3 V0 I1 bproperties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the& V6 q g2 Q7 Q# b) i
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
5 Q( l, U y2 u/ u: S. Dlevel increasing with age of the fish. In turn, bio magnification along the food chain leads to
! M5 z6 N8 h `higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other9 w4 g, t+ a# |/ {/ U+ H
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
3 j: S5 {. i& |% mlesser extent than methyl mercury.4 B) v/ v/ a" j9 m$ K0 _8 X/ E) Y" Q0 P
APPENDIX I
; b9 M. U8 K. |* VSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
& d7 F# K# v4 [% |' F/ ^(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
, R% R; Z/ V0 C: GSamples were collected at the importers= or at domestic processing plants during the periods April 1,
' [( P0 A' s, z; ^- U% p( ]2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
, `, [- m0 `* x) `# }, |( [8 gconcentration of zero indicates that mercury was not detected above the analytical detection limit.
9 g5 Z6 N \( S7 O( KTotal Mercury Concentration
+ V) B. o% U/ E) r! _1 E(ppm)
3 D0 a9 e9 [9 D5 |9 G8 h7 @Species x3 G! t% B& b5 d: o# L
No. of3 A# }. o. U) B t0 I! B
samples. J. Y `2 Y# z' R' \1 j6 ^
(N) Mean Median Min Max
/ x" Q; b- W! h. @( c& TAmberjacks 3 0.17 0.14 0.11 0.27
6 g& t7 J3 z1 f5 [Barracouta 1 0.06 0.06 0.06 0.06
3 Z3 q# ^/ [" p7 wBasa 5 0.02 0.02 0.02 0.02
0 x6 ?& Q8 ]; r4 BBullhead, Brown 2 0.09 0.09 0.07 0.1# T: M3 @! `; t( }( Z+ \" l1 c
Capelin 4 0.02 0.02 0 0.05. w) }! |4 G9 b5 M
Carp 1 0.1 0.1 0.1 0.1# v0 X |- D% k4 u" V: z
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
2 e; o$ C/ H) M6 E: k9 o3 E- JChar, Arctic 5 0.09 0.10 0.05 0.058 B" r" ]7 Z7 }7 \! I5 z a$ c! d+ L
Clam (various species) 40 0.03 0.01 0 0.088 N. z- q% w& m% ^2 E# z& |8 `1 F
Cockle, Greenland 1 0.05 0.05 0.05 0.05% E9 @) a+ c5 ]7 @
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28, o* c" w$ h9 `& M' o# |
Crab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
- O4 l( S# o+ a% W2 TCrawfish 1 0.1 0.1 0.1 0.1( L* h* C m4 W, B: x) [. v
Drum, Freshwater 2 0.22 0.22 0.03 0.45 u- \' i" D4 J" |: o; I
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
7 B. p& l5 q6 @" pEel (species not specified) 107 0.24 0.16 0.01 1.702 ~$ b0 [/ W2 w* K8 A1 _: `4 r, M
Flounder (various species) 22 0.06 0.06 0.03 0.12
0 e% y/ D# |- G1 @5 D$ F8 O2 THaddock 3 0.05 0.05 0.03 0.07 |
|