title: Sequential toxicity identification evaluation (TIE) for characterizing toxicity of Venice Lagoon sediments: comparison of two different approaches.
abstract: A toxicity identification evaluation phase-I (TIE-1) procedure was carried out on five pore water samples extracted from sediments of the Venice Lagoon previously investigated to assess both chemical contamination and toxic effects on the biota. Two different sequential TIE procedures were tested. A first sequence (TIE-1) provided for adding Na2S2O3, adding Na-EDTA, filtering, elution through a C18-SPE column and removing ammonia using the macroalgae Ulva rigida Agardh 1823, while a second procedure (TIE-2) was set up using U. rigida treatment for ammonia removal as first step, keeping unchanged the sequence of the other manipulations. Two different exposure time to the macroalgae were tested (3-h and 15-h). Sperm-cell toxicity test with the echinoid Paracentrotus lividus and embryotoxicity tests with the bivalves Mytilus galloprovincialis and Crassostrea gigas were performed on pore-water samples to assess the effect of the sequential treatments on the overall toxicity. The results confirmed that ammonia contribution to toxicity is strong in most of the samples and that metals, specially Cu, are of concern at least in three sites. The TIE-2 procedure provided more reliable results for the samples characterized by high ammonia contribution to the overall toxicity, whereas the results of TIE-1 and TIE-2 were equivalent for the samples where ammonia contribution was not prevailing. Chemical analyses and test results showed that a 3-h U. rigida exposure is suitable to remove ammonia toxicity minimizing potential metal up-take.
authors: Thetis S.p.A., Castello 2737/f, I-30122 Venice, Italy. marco.picone@thetis.it
authors: Marco
authors: M
authors: Picone
authors: Martina
authors: M
authors: Bergamin
authors: Elisa
authors: E
authors: Volpato
authors: Eugenia
authors: E
authors: Delaney
authors: Clara
authors: C
authors: Turetta
authors: Martina
authors: M
authors: Ranaldo
authors: Gabriele
authors: G
authors: Capodaglio
authors: Cristina
authors: C
authors: Nasci
mesh_terms: D000641:Ammonia / Q000032:analysis / Q000633:toxicity; D000818:Animals; D049872:Bivalvia / Q000187:drug effects* / Q000196:embryology; D002947:Cities; D019015:Geologic Sediments / Q000032:analysis* / Q000737:chemistry; D007558:Italy; D008297:Male; D008670:Metals / Q000032:analysis / Q000633:toxicity; D047328:Paracentrotus; D012623:Seawater; D013094:Spermatozoa / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D013997:Time Factors; D018675:Toxicity Tests / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical; D000641:Ammonia