Combined Compounds

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Combined Compounds

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Combined compounds functionality is designed to allow automatic adding of concentrations of specified compounds.  For example it could be specified that TPH ranges C6-C10, C11-C14,C15-28,C29-36 be automatically added together to give C6-36.

 

Compounds that are to be combined are entered into the reference table zRef_Combine_Compounds (select Import - Data Tables - zRef_Combine_Compounds to generate an import template).  The compounds to be combined are entered with the combined compound name as below.

 

ChemName

CombinedName

Weight

4,4-DDE

DDT+DDE+DDD


DDD

DDT+DDE+DDD


DDE

DDT+DDE+DDD


DDT

DDT+DDE+DDD


 

All names must be valid names in the Chemistry Lookup Table.  Compound names that don't match can be corrected by clicking the "Get ChemCodes" button in the Import Template and assigning the correct name.  A weight can be applied to each compound if necessary.  A weight of 1 is used by default.

 

Compounds are added together using a multiplier for non-detects.  This can be specified under Setup - Chemistry - Post Import Calculations and Combined Compounds.

 

If all contributing compounds are non-detects the user can specify whether to A) use the multiplier to calculate an estimated concentration, or B) to give a non-detect of the sum of the detection limit values.