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Human Health Risk Assessment of Mercury in Fish March 20073 S P& T( {- v d$ z1 [
and Health Benefits of Fish Consumption
' H+ D& L" R4 L, D [ bWith respect to the types of mercury found in fish, both inorganic and organic mercury may be
. [; x1 [! t& C2 ~8 F, `. x: lpresent. However, methyl mercury is the predominant form of mercury in fish. It’s chemical; [$ k) t3 `* d' b2 M
properties allow it to rapidly diffuse and tightly bind to proteins in aquatic biota, including the
1 _/ \3 }, L; M7 ?. e, Y* \$ ~0 uproteins in the muscle tissue of fish. This leads to bioaccumulation in the fish, with the mercury- m7 C9 r8 K; m. p
level increasing with age of the fish. In turn, bio magnification along the food chain leads to
- U* r7 e) b0 vhigher mercury levels in piscivorous fish that are higher in the food chain than in fish and other# x; K# V; W* a' M3 P5 L, ]1 g
organisms that are low in the food chain. Inorganic mercury can also bio accumulate but to a far- M6 C* B3 e; t% Z: B1 n# t$ c
lesser extent than methyl mercury.: G9 Z! T4 Q9 N4 J* Q
APPENDIX I- X& M$ T3 V8 i0 |1 v5 y
Summary data for those samples of fish that were found by the Canadian Food Inspection Agency- g ?: }, y: K2 p7 X' }
(unless otherwise noted) to contain, on average, approximately 0.2 ppm or less total mercury./ G$ F; J7 z" i# f$ Q% a2 [
Samples were collected at the importers= or at domestic processing plants during the periods April 1,8 L8 u9 x) j0 X+ o6 X' Q
2002 to March 31, 2003 and April 1, 2003 to October 7, 2004 (unless otherwise noted). A
7 X) r+ F* B" |8 J3 gconcentration of zero indicates that mercury was not detected above the analytical detection limit.
# t9 i9 p4 ]% B+ E( _# T2 ^Total Mercury Concentration
1 }3 r. O5 ^9 z, O" J(ppm)- u: V& F. m2 G6 o+ c; O
Species
7 H0 z$ E3 l. t- tNo. of
/ _6 m- Y3 q9 n2 H( u& s% z+ B; ~1 w2 `samples
2 Q+ n6 x7 U, y, g/ Q7 h(N) Mean Median Min Max7 e+ L. k4 H7 }! V) ~
Amberjacks 3 0.17 0.14 0.11 0.27
9 S; Q L' ?2 }- r8 BBarracouta 1 0.06 0.06 0.06 0.06
" ?4 D$ u1 O7 w2 h$ |' d- _5 \8 [Basa 5 0.02 0.02 0.02 0.02# J3 E: b+ N J" T
Bullhead, Brown 2 0.09 0.09 0.07 0.1
( F" D7 u) s ]4 L, ?7 G- NCapelin 4 0.02 0.02 0 0.05
4 k& G3 a! X* ~Carp 1 0.1 0.1 0.1 0.11 l) `. N4 S$ ^, `' o2 \* V! R1 x
Catfish (Channel or unspecified) 16 0.15 0.14 0.02 0.373 d7 a- w5 E% D1 E
Char, Arctic 5 0.09 0.10 0.05 0.058 K: @4 s8 `, T2 H. y' |
Clam (various species) 40 0.03 0.01 0 0.08/ f; n8 ~6 V( `2 ^, o
Cockle, Greenland 1 0.05 0.05 0.05 0.051 k8 Z0 `4 R" E
Cod (Atlantic, Pacific or unspecified) 34 0.06 0.06 0 0.28
; m$ ~+ L6 e4 J- s& PCrab (Dungeness, Rock, Snow) 19 0.09 0.07 0 0.37
7 O& C7 N" \, m5 d, KCrawfish 1 0.1 0.1 0.1 0.1
$ h( x* \6 C# FDrum, Freshwater 2 0.22 0.22 0.03 0.4
9 t- h+ f& T* c% DEel (American, Conger/sea, Spiny/spotted) 52 0.19 0.10 0 0.767 u$ _- b: D. `. H
Eel (species not specified) 107 0.24 0.16 0.01 1.706 Z; v& V1 `( n; h( y
Flounder (various species) 22 0.06 0.06 0.03 0.12% c8 c8 Y# C3 K
Haddock 3 0.05 0.05 0.03 0.07 |
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发表于 2012-10-27 10:21
