Parameter values and data

The data needed for this exposure assessment include surface water concentrations based on limited monitoring data from fresh and ocean water, laboratory-scale BCF experiments and activity patterns (variation in long-term average fish consumption). We also have biomonitoring data derived from limited geographical, temporal and population subgroup coverage. 

Chemical Total number of samples Limit of detection (LOD) (ng/l) Number of samples LOD Concentration range (ng/l) Median concentration (ng/l) Surface water type 

The value of a quantitative uncertainty analysis depends on the care given to the process of constructing probability distributions. The process of constructing a distribution from limited and imprecise data can be highly subjective. This process becomes more objective as the number of data for a given parameter increases. However, a large set of data does not necessarily imply the existence of a suitable distribution function. 

Fish BCF distributions for PBLx were constructed from data collected at six different laboratories where experimental measurements were carried out on multiple fish species. The range of measured BCF values is displayed in Table A2.3, along with information on the fish species used and laboratory where the experiments were carried out. 

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