APPENDIX
Table ]
Unless otherwise noted, results of interactions are derived from laboratory experiments on various species of aquatic life.
Results of Interactions with:
Substances
pH
,
Temperature
Hardness
W
Ammonia;
Toxicity increases with inAmmonium;
crease
in pH. ln experiments
Ammonium
with
sh, toxicity increased
Hydroxide
200% when pH was raised
from 7_.4 to 8.0.
Cadmium
___—___——————————————_——
Calcium
WM
Chlorine
Toxicity increases with clecrease in pH.
Chromium
…
Cobalt Sulfate
Copper
Above pH 7, a precipitate—
Copper
precipitates
copper
hydroxide—may be
are formed in hard waformed, making the solution
ter, reducing their toxless toxic.
icity.
_…
Cyanide;
pH 8, hydrogen cyanide
Toxicity
is
inln some experiments,
Hydrogen Cyamde
us
in
its
undissociated form
creased
two
to
CN was more toxic in
(HCN) and is toxic. When the
three times with a
soft water.
pH of a solution containing a
10°C rise in temnickelo-cyanide
complex
perature.
dropped from 8.0 to 6.5, the
toxicity of the solution in_
.
creased 1000 times [7].
190
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