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Organic Speciation File Information

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ORGSPEC: This file contains the actual weight fraction (WTFRACOFTOG) that each compound is of the TOG (total organic gas) emitted by a source. The ORGPRFCD and ARBCHEM codes are the two key (index fields) that define unique records. The CHEMNAME and CAS fields are not necessary in this file, and are repeated in the CHEMXREF file (see the information for that file for their field definitions). They are simply included here for ease of viewing.

  1. ORGPRFCD: Field containing the organic profile code assigned to the speciation profile. This code is an arbitrary code assigned by CARB. It is uniquely listed in the ORGPROF file.
  2. ARBCHEM: Field containing CARB's entirely arbitrary 5 digit chemical code. This is not the same as any code used by any other organization. It used to be referred to as the SAROAD code, but that allowed for confusion, since other organizations also used the "SAROAD" designation. This code allows linkage to the CHEMXREF file, which contains further definitions for this compound. The linkage to the CAS code is very important, since the CAS code is the standard code used by many organizations. Unfortunately, not all of the compound groupings included in CARB speciation profiles have CAS codes, and in some cases there may be multiple CAS codes for a given ARB speciation profile. The ARBCHEM code reduces the possibility of confusion.
  3. WTFRACOFTOG: This is the actual weight fraction that each compound is of the TOG (total organic gas) emitted by a source. This is the number that will be multiplied by the TOG emissions contained in the CEIDARS database to produce the speciated emissions.

Master-detail link diagram

Master-detail link diagram

The data in this file are used in order to speciate the TOG emissions from a source into compounds. In order to do this, you would link the WTFRACOFTOG field in the ORGSPEC file to the source categories (SCC/EIC codes) indicated in the SCCORG file via the ORGPRFCD field, and then to the CEIDARS emission data files via the SCC field (actually SCC or EIC codes). Note that this profile may link to many SCC/EIC designated source codes.