Entity Type Description:
The Chemical Substance (CHEM_SUBST) entity type contains data identifying chemical substances that are regulated or monitored by EPA systems. Each substance is unique and is either a specific chemical, category, non-specific isomer or mixture. The entity type also includes references to biological, physical, and toxicological properties that are monitored by the Permit Compliance System (PCS).
Contains one record for each chemical referenced in EMCI using EMCIRN as the unique key. A chemical substance in CHEM_SUBST may refer to:
- Multiple records in SYS_CHEM, retrievable by EMCIRN.
- Multiple records in SUBST_REL identified as GROUP_EMCIRN.
- Multiple records in SUBST_REL identified as COMPONENT_EMCIRN.
Subject Area: Chemicals
Entity Type Definition Source:
Functional Design for the Envirofacts Master Chemical Integrator, September 1994.
Entity Type Attributes: