|SREL Reprint #0369|
NTA and Mercury in Artificial Stream Systems
J. Kania and R. J. Beyers
Studies were conducted in six artificial stream
channels to determine the fate of NTA (nitrilotriacetic acid, trisodium salt)
added with and without sodium phosphate to these systems.
In the two hour period required for a given water mass to traverse the
channels, there was no appreciable removal of NTA or phosphate, even after a one
month period of continuous input. Visible
biological differences were noted between the various treatments.
These differences may have been a result of pH alteration caused by the
addition of the trisodium phosphate and NTA.
In anticipation of along term program involving the
fate of mercury and possible mercury-NTA interactions, several modifications
were incorporated into the artificial stream system. Based on the results of laboratory studies, a mercury removal
system utilizing shredded rubber tires as obtained from commercial tire
recapping firms, was constructed. Laboratory
studies indicated that NTA did not influence the uptake of mercuric ion by the
rubber. The presence of NTA did
alter the uptake pattern and final concentration by mosquitofish, Gambusia
This report was submitted in fulfillment of Grant
16050 GQQ, Program Element 1BA023, to the University of Georgia under the
sponsorship of the Environmental Protection Agency.
SREL Reprint #0369
Kania, H.J. and R.J. Beyers. 1974. NTA and mercury in
artificial stream systems. U.S. Environmental Protection Agency.
EPA 660/3 73 025.