Poel P van der2012-12-122012-12-121991-10-31http://hdl.handle.net/10029/262153Abstract niet beschikbaarThis report describes the concept of the computer program PECker and includes a manual. The program PECker has been designed to calculate the Potential Environmental Concentration (PEC) for aquatic organisms nearby a source of pollution. The PEC is not presented as an absolute number. The general approach which is followed implies uncertainties and variations in all parameters. These uncertainties are estimated as well. The program was designed to enable a quick risk assessment for new substances notified in the EC for which a base set of data (e.g. the physicochemical properties, function and applications, toxicity for aquatic organisms) is available. In future PECker can be expanded to cover the PEC for air and soil. The data on the expected releases into the environment due to the function and application of substances are based on studies carried out for several studies for specific applications of substances. The data for the releases are presented in chapter 4.41 pen1291-4new substancespotential environmental concentration; environmental releasesReport2012-12-12