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Environmental fate & pathways

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There are many studies in the literature relevant to the bioaccumulation of silver. However, many of these studies do not report sufficient information for BCF values to be calculated. In addition, many of the data were obtained from studies of short duration which did not achieve steady-state conditions. The available reliable studies suggest low BCF values for fish, although studies of the accumulation of silver by molluscs, such as Hedouin et al. (2006), indicate the potential for higher BAF values for these organisms.

As data on bioaccumulation for fish are preferentially selected for this information requirement under REACH, the key study selected for this endpoint is Baudin et al. (1993) in which carp were exposed to silver in water for a six-week period, followed by a depuration phase. A steady state concentration in fish was achieved after 30 days exposure and a BCF value of 70 was calculated for the whole fish on a wet weight basis.