26
800
700
600
500
400
300
200
~ 100
.:.
c
,g 0
I!! 200
1:
2l
6 180
(,)
160
140
120
100
River and Stream Sediments
Zn
Ni
o E F G H
d
e
V~6
J KLMNOPQRST UVWXZ
Sample location
Fig. 2.2 a-g The concentration (jlg/ g) of Cd, Cu, Pb, Zn, Ni, Cr, and Co as a function of sample location in the bottom sediments of the Rideau River, extracted by the following methods:
t:.. = HF-HNOrHCIO. (6 + 4 + 1) in Teflon bomb; • = 4.0 N HN0 3 + 0.7 N HCI; 0 = 0.5 N HCI;
• = IN NHpH·HCI + 25 % CH 3 COOH; 0 = 0.05N EDTA (from [37]).