Ecological Toxicology Chemical A and Chemical B are discharged to the river by a
ID: 1712360 • Letter: E
Question
Ecological Toxicology
Chemical A and Chemical B are discharged to the river by a factory. Chemical A reaches an average in-stream concentration of 10 ug/l, while chemical B reaches an average in-stream concentration of 100 ug/l. We want to know if there is reason for concern for these concentrations in the stream. We conduct aquatic bioassays using rainbow trout with the following results:
Chemical A Chemical B
Conc. (ug/l) %Mortality Conc. (ug/l) % Mortality
0 0 0 0
1 10 1 0
5 25 5 5
10 50 10 7
80 75 80 9
100 100 100 10
150 100 150 50
200 100 200 100
C. Should we be concerned with the discharge of chemical A or chemical B, why or why not?
Explanation / Answer
% mortality means % of deaths occuring due to the presence of chemicals in the river.
We should be concerned with the discharge of Chemical A becasue it causes 50% of the river population to die when it is released at a concentration of 10ug/l. But chemical B does not have such a serious impact
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