 鲜花( 13)  鸡蛋( 1)
|
Human Health Risk Assessment of Mercury in Fish March 2007* i; ~4 s5 m) b1 a$ i6 I# b1 }$ c* g
and Health Benefits of Fish Consumption
3 B8 o/ P( ]0 e* J& w% PWith respect to the types of mercury found in fish, both inorganic and organic mercury may be5 Q& Z2 e8 h5 x3 |8 I+ E9 R6 P. x
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical J( w" B$ C2 s8 H* B4 N$ i+ Q* s! C
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the5 i$ L; D3 T/ q g$ h0 k
proteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury
! D# a/ y0 l6 S# L: ]level increasing with age of the fish. In turn, bio magnification along the food chain leads to- q3 a9 ^# H7 k6 L% W) D! b& \
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
$ t& w; v8 X+ B; norganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
% q# h6 o2 U7 A. S1 W: ilesser extent than methyl mercury.
! @" P7 u) b+ D _% N7 hAPPENDIX I
# T: C) P1 l8 n) V7 _) |& _Summary data for those samples of fish that were found by the Canadian Food Inspection Agency
- x( _. L# y: e. h" D(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.
1 l ?, J9 z3 oSamples were collected at the importers= or at domestic processing plants during the periods April 1,
! s+ F1 m, a* ` S+ \2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A0 L" ^' c9 |- Z% d! ~2 y) K" U
concentration of zero indicates that mercury was not detected above the analytical detection limit., o8 N y4 @8 f2 Z/ X5 d
Total Mercury Concentration& G) O4 o6 W& S2 q
(ppm)0 k- N! ^( x8 J, G1 q, c
Species2 [& x, d, @' K/ Y7 p* G2 l
No. of* |# Z4 O# L$ N( L. _0 M$ H
samples
: N. v! X1 S$ {; J& i; I) T' f(N) Mean Median Min Max
* Q" ] x! q* t. ]4 IAmberjacks 3 0.17 0.14 0.11 0.27
9 Y0 A! ]/ d$ @# x' TBarracouta 1 0.06 0.06 0.06 0.06) e9 b7 k6 k: E2 n. x: d5 y: I
Basa 5 0.02 0.02 0.02 0.02
0 F$ M1 e6 M eBullhead, Brown 2 0.09 0.09 0.07 0.10 ]* |9 _- D; \6 {, Q) o
Capelin 4 0.02 0.02 0 0.05 o5 x% m- `0 s
Carp 1 0.1 0.1 0.1 0.1
+ \8 \! T, H7 f9 NCatfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
5 y$ U1 B. j0 C6 X- dChar, Arctic 5 0.09 0.10 0.05 0.05! d1 {$ a( t3 T3 p
Clam (various species) 40 0.03 0.01 0 0.08
# X% Q: v" R& W2 R1 ]Cockle, Greenland 1 0.05 0.05 0.05 0.05
% y F+ Z9 ^/ j6 hCod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
. ~, K) P' e3 ~4 s: ^# E9 zCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
6 M* L" A; H0 @, Q* A- M' uCrawfish 1 0.1 0.1 0.1 0.10 f4 s8 e: K& m$ ] B# u2 X
Drum, Freshwater 2 0.22 0.22 0.03 0.41 Y3 S7 d2 B, O$ ^8 i
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
, n# R Z% X. ^4 m0 f, o: qEel (species not specified) 107 0.24 0.16 0.01 1.70
2 r6 g- R" o) l0 `6 w" t; M0 r( [Flounder (various species) 22 0.06 0.06 0.03 0.12: e. u! p4 Z$ X# z) Y( q
Haddock 3 0.05 0.05 0.03 0.07 |
|