Page 154 - Soil and water contamination, 2nd edition
P. 154
Heavy metals 141
About 100 km further downstream, heavy metal contamination of the sand fraction of
Meuse sediments is low, whereas the contamination in the bulk sediment remains high.
a. What was the speciation of the heavy metals as they entered the river system?
b. What is the main cause of the decrease in contamination in the coarse particle size
fraction with increasing distance downstream of the contamination source?
c. What has happened to the metals associated to the coarse particle size fraction?
d. What is the main difference in the relationship between heavy metal concentrations
and clay and organic matter content for Geul sediments just downstream of
Plombières and for Meuse sediments 100 km downstream of the Geul–Meuse
confluence?
10/1/2013 6:44:34 PM
Soil and Water.indd 153
Soil and Water.indd 153 10/1/2013 6:44:34 PM
