Next: Expert Mode vs. Easy-To-Use Up: Basic Concepts Previous: Scenario Concept

### Substance Database

The substance unique ID (key) is the concatenation of its name and its CAS No. (Chemical Abstract Service Number). The CAS alone is not sufficient because it is often not (quickly) available and it does not make sense to use any other number (which might be that of another substance) instead. Furthermore it is not sufficient to only use the name of a substance as the key, since the typography does not seem to be commonly used (eg. Pentachlorphenol/Pentachlorophenol/PCP).

It is possible to have many different substance databases. The default database delivered with GREAT-ER should only be modified/extended if the new values can be trusted (literature/laboratory reference).