020 r
0.15 f, Mercure
0.05
0,00
111711
... () 1981 ,,., 1 . . 3 1984 1985 1'86 1987 1 ...
1,0 1
0.8
~
0.6
!fr
~ 0,4
0.2
o.o 1979 198() 1981
2.5
2.0
1.5
!fr
r
1,0
0.5
0.0
,.,. 1'8-0 1oe1 1ot2 1003
1989
1990
1991
30
.
DDT ~
25
20
:;.
!fr 15
g
10
120
!fr 90
r
60
30
o ~
10
~
j.
r
-
1
-
198()
1981
l
-
- i [
- 1 -,- - , _
-
-
1982
,.., 11184 198S 19 . .
-
~- - -
- -
-
11 il.
-
1982
1!il8J
1!J!4
1 . . ,
1986
0
1979
1980
1981
1992
JI 4
g
w.: 1:cïJ:w
111711
198(1
... 1
PAH
.
1979
1980
1981
1982
1983
1964
198S
1986
~
~
L_
~
n ~
i1987
, ... 1 .. 9 199() 1991
,_
1 ~
!I
-
11!
1 .. 7
1988
1989
199-0
1991
1991
1 . . 7
1988
1989
1990
1991