Uptake from water, depuration and tissue distribution of110mAg in a freshwater fish,Cyprinus carpio L.

Abstract

Abstract. Radionuclide accumulation was studied on a group of 20 fish maintained at 20 • 1 ~ in spring water containing 30 Bq mL -1 of 110mAg. Because of a very significant radionuclide adsorption onto available surfaces and in order to simulate chronic exposure, the water was completely renewed three times a week. Accumulation of 110mAg was slow, with an estimated time to maximum contamination level of 180 days. The concentration factor, calculated from the ratio of the integrals of the curves representing the radionuclide concentration in filtered water and in whole fish reached a maximum value of 106 (w.w.). After 41 days exposure, 10 fish were placed in non-labelled water, renewed daily, to follow 110mAg deputation. A two-compartment exponential model was fitted to the depuration data. The corresponding radionuclide half-lives were relatively short, 0.8 (Tbl) and 30 days (Tb2), and after 6 weeks the fish retained about 30% of their initial 110mAg content. The liver and digestive tract retained most ll0mAg. Although they only represented respectively about 4 and 10% of the total body mass, these two organs accounted for 30-40% of the total radionuclide body burden.

A study of 110mAg in aquatic and terrestrial ecosystems

“…Due to the corresponding biological half-lives of 0.8 and 30 days, respectively, the fish retained about 30% of the initial l l~ within 6 weeks [7].…”

“…Baudin et al [7] reported that accumulation of l l0mAg in a freshwater fish, Cyprinus-carpio L, was slow with an estimated time to maximum contamination level of 180 days. They noted that although the liver and digestive tract only represented about 4 and 10% of the total body mass, respectively, these two organs accounted for 30-40% of the total radionuclide body burden.…”

A probabilistic model for silver bioaccumulation in aquatic systems and assessment of human health risks

“…Because BCFs, ␣, and k e in carp and trout show substantial differences (Table 1), carp and trout were modeled separately. Mean steady-state BCFs extrapolated from laboratory data served as point estimates for brown trout (Salmo trutta) [35] and common carp (Cyprinus carpio) [36]. To estimate variation, confidence intervals for weekly mean Ag concentrations in trout over the uptake period were converted to geometric standard Aquatic silver bioaccumulation and human health risks Environ.…”

“…Ingestion of Ag through contaminated fish and treated drinking water was estimated for freshwater anglers and subsistence fishers ( Table 2). For this protective, screening-level assessment, 90th percentile Ag concentrations in whole fish were converted to wet-weight muscle concentrations C f (mg/ kg) assuming a moisture content of 0.74 for both fish species and muscle:whole-fish concentration ratios of 0.11 and 0.25 for trout and carp, respectively [35,36,39,40]. The Ag dose from fish consumption I f (mg/kg/d) is [47] C · IR · ␣ · EF· ED…”