Assessment of EDTA in chromium (III-VI) toxicity on marine intertidal crab (Petrolisthes laevigatus).
Chromium poses a potential threat to coastal ecosystems. We used standard toxicity bioassays (semi-static, chronic) to evaluate EDTA as a chelating agent for reducing trivalent and hexavalent chromium toxicity on Petrolisthes laevigatus. Crab survival decreased linearly with increased chromium concentrations and dropped significantly beginning at 40 mg/L Cr (VI) and 80 mg/L Cr (III). No significant differences were observed with Cr (III) + EDTA as compared with untreated controls. Cr (VI) toxicity was greater than that of Cr (III), with low individual survival rates. The protective effect of EDTA in the medium increased crab survival by 41%-48%.
Urrutia
Carolina
C
Facultad de Ciencias, Universidad Católica de la Santísima Concepción, Casilla 297, Concepción, Chile.
Rudolph
Anny
A
Lermanda
Maria Paz
MP
Ahumada
Ramón
R
D000818:Animals; D001681:Biological Assay; D003386:Brachyura; D002614:Chelating Agents / Q000633:toxicity*; D002677:Chile; D017608:Chromium Compounds / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D004347:Drug Interactions; D004492:Edetic Acid / Q000633:toxicity*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D008136:Longevity / Q000187:drug effects; D009566:Nitrates / Q000633:toxicity; D011192:Potassium Dichromate / Q000633:toxicity; D012623:Seawater; D018675:Toxicity Tests; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D002614:Chelating Agents; D017608:Chromium Compounds; D004338:Drug Combinations; D009566:Nitrates; D014874:Water Pollutants, Chemical; D004492:Edetic Acid; C041167:chromium nitrate; D011192:Potassium Dichromate