Predicted Environmental Concentration

The Predicted Environmental Concentration (PEC) is a theoretical value that indicates the concentration of a substance that is expected in the environment. Here, factors such as mining and distribution are taken into account.

Important factors are exemplary in aquatic systems:

• Water type
• Wind direction
• Distance to the water
• Riparian vegetation
• Vegetation of the water body
• Slope profile
• Water profile
• Width and depth of the water
• Amount of water
• Dehydration
• Retreat areas of the water

• Production volume of the substrate
• Area of ​​application (e.g. grain or viticulture) of the substrate
• Physico-chemical properties of the substrate

To estimate the exposure of surface water to plant protection products, PEC values ​​are determined using a probabilistic method. For this purpose, various regression analyzes are carried out to model the drift. The selected drift distribution is then combined with different distribution approaches for the application rate and the water volume.

The risk ratio RCR ( Risk Characterization Ratio ) for the environment is then calculated from the PEC and PNEC in the risk assessment as follows:

${\displaystyle RCR={\frac {PEC}{PNEC}}}$

Individual evidence

1. ↑ Abbreviations used in REACH. (PDF) DGUV - German Statutory Accident Insurance, accessed on July 17, 2019 . 
2. ↑ Glossary. PEC. https://nanopartikel.info/ , accessed on July 17, 2019 . 
3. ↑ Systemadmin_Environment: Monte Carlo simulation for estimating the exposure of surface water due to the drift of pesticides . Federal Environment Agency, 1st December 2011 ( umweltbundesamt.de [accessed on July 16, 2019]).
4. ↑ Guidance on Information Requirements and Chemical Safety Assessment. (PDF) Part E: Risk Characterization. In: ECHA . May 2016, p. 8 , accessed on April 6, 2019 (English).