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SEDIMENT TESTING INTERMITTENT RENEWAL SYSTEM FOR THE AUTOMATED RENEWAL OF OVERLYING WATER IN TOXICITY TESTS WITH CONTAMINATED SEDIMENTS
Citation:
Benoit, D., G. Phipps, AND G. Ankley. SEDIMENT TESTING INTERMITTENT RENEWAL SYSTEM FOR THE AUTOMATED RENEWAL OF OVERLYING WATER IN TOXICITY TESTS WITH CONTAMINATED SEDIMENTS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/278 (NTIS PB93222362), 1993.
Description:
A sediment testing intermittent renewal (STIR) system (stationary or portable) for invertebrate toxicity with contaminated sediments has been successfully developed and thoroughly tested at ERL-Duluth. oth the stationary and portable systems enable the maintenance of acceptable water quality (e.g. DO) through the capability of automatically renewing overlying water in sediment tests at rates ranging from 1 to 21 volume renewals day. he STIR system no only significantly reduces the labor associated with renewal of overlying water but also affords a gentle exchange of water that results in virtually no sediment resuspension. oth systems can also be installed in a compact vented enclosure to permit safe testing of hazardous contaminated sediments. o date the STIR system has been used extensively for conducting 10-day bulk sediment tests with Chironomus tentas, Hyalella azteca, and Lumbriculus variegatus.