 鲜花( 13)  鸡蛋( 1)
|
Human Health Risk Assessment of Mercury in Fish March 20077 T) W, \- P8 E7 x, r- z4 B
and Health Benefits of Fish Consumption3 y& `& N5 @" o) I* i& J# I
With respect to the types of mercury found in fish, both inorganic and organic mercury may be0 H+ d5 S/ l9 @5 k& L
present. However, methyl mercury is the predominant form of mercury in fish. It’s chemical$ ^9 }' M: Y# h* F6 Z' P
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
+ n! _9 W' s+ }/ U3 S- q! e7 yproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury+ P3 U8 g# I( \. [4 l; j0 r _* N' _- s; ^
level increasing with age of the fish. In turn, bio magnification along the food chain leads to k1 t% m" x3 O# e
higher mercury levels in piscivorous fish that are higher in the food chain than in fish and other
% ^( O3 V6 [. m( n9 w8 Lorganisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far
. m7 B' C6 B1 E+ X. Y8 k! olesser extent than methyl mercury.
Q5 V8 ]' q0 _3 \8 B; F3 hAPPENDIX I
( o# B2 s+ Q( Q% m. X" p$ KSummary data for those samples of fish that were found by the Canadian Food Inspection Agency
9 H) F: m$ R8 X(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury.) o, {7 c; G& f% }+ K
Samples were collected at the importers= or at domestic processing plants during the periods April 1,5 K# I- f6 J: ^: ^
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A. B5 j3 h4 g7 p: t+ r4 x2 b
concentration of zero indicates that mercury was not detected above the analytical detection limit.
' E5 k& [ ?$ q3 E4 oTotal Mercury Concentration
& y+ `" y1 K. P8 b(ppm)
7 V/ X! l1 s, I1 O% v* V. n2 oSpecies
$ N9 d* o. P: u& pNo. of" |; ], p1 P. O
samples
; G! d0 e5 z6 |(N) Mean Median Min Max
6 y! `4 }! O9 KAmberjacks 3 0.17 0.14 0.11 0.27 W O5 X, ^' }& s" Z' J
Barracouta 1 0.06 0.06 0.06 0.06& W! `4 L9 z. R/ @* U, p
Basa 5 0.02 0.02 0.02 0.02
. d5 A% h! m. {" X# r# C4 }5 ^Bullhead, Brown 2 0.09 0.09 0.07 0.1# n" G/ t8 [! z
Capelin 4 0.02 0.02 0 0.053 }% P% P `( s& r6 i/ v" N1 T
Carp 1 0.1 0.1 0.1 0.1+ ?; S' i% n. ~4 T1 B3 {. I
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.37
: ?. _7 ?1 M6 n& VChar, Arctic 5 0.09 0.10 0.05 0.05
" k4 Z% u9 m9 v$ F( I6 O9 E& bClam (various species) 40 0.03 0.01 0 0.08
' h5 q# L2 I% \Cockle, Greenland 1 0.05 0.05 0.05 0.05# k3 ]9 M7 ^0 @
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
# \$ U F* k5 l, rCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37& L3 K6 }5 X8 @, r0 U
Crawfish 1 0.1 0.1 0.1 0.10 c% B! t! v2 l+ P& X
Drum, Freshwater 2 0.22 0.22 0.03 0.4( I0 h, v( Q% z: ]+ c" I
Eel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.76
O8 e+ A2 r E7 j) T3 v) L A) oEel (species not specified) 107 0.24 0.16 0.01 1.70
# `% Y4 n! q# n0 P" N$ TFlounder (various species) 22 0.06 0.06 0.03 0.12" J6 h& {6 l0 b7 l8 v: f* `
Haddock 3 0.05 0.05 0.03 0.07 |
|