A MICROCOSM STUDY TO SUPPORT AQUATIC RISK ASSESSMENT OF NICKEL: COMMUNITY-LEVEL EFFECTS AND COMPARISON WITH BIOAVAILABILITY-NORMALIZED SPECIES SENSITIVITY DISTRIBUTIONS

The aquatic risk assessment for nickel (Ni) in the European Union is based on chronic species sensitivity distributions and the use of bioavailability models. To test whether a bioavailability-based safe threshold of Ni (the hazardous concentration for 5% of species [HC5]) is protective for aquatic communities, microcosms were exposed to 5 stable Ni treatments (6-96 mu g/L) and a control for 4mo to assess bioaccumulation and effects on phytoplankton, periphyton, zooplankton, and snails. Concentrations of Ni in the periphyton, macrophytes, and snails measured at the end of the exposure period increased in a dose-dependent manner but did not indicate biomagnification. Abundance of phytoplankton and snails decreased in 48 mu g Ni/L and 96 mu g Ni/L treatments, which may have indirectly affected the abundance of zooplankton and periphyton. Exposure up to 24 mu g Ni/L had no adverse effects on algae and zooplankton, whereas the rate of population decline of the snails at 24 mu g Ni/L was significantly higher than in the controls. Therefore, the study-specific overall no-observed-adverse-effect concentration (NOAEC) is 12 mu g Ni/L. This NOAEC is approximately twice the HC5 derived from a chronic species sensitivity distribution considering the specific water chemistry of the microcosm by means of bioavailability models. Thus, the present study provides support to the protectiveness of the bioavailability-normalized HC5 for freshwater communities. (C) 2015 The Authors. Environmental Toxicology and Chemistry Published by Wiley Periodicals, Inc. on behalf of SETAC.