Constituents

The Constituents table is used to indicate the regulatory standards and measurement units for every constituent-media pair. All of the constituents recorded in the Observations table must be listed in the Constituents table.

Field Name	Description	Data Type	Must be Populated?
Constituent	Name of measured parameter	Text String	Yes
Units	Parameter units	Text String	Yes
Media	Media in which parameter is measured (e.g., soil, water)	Text String	Yes
Fraction	Indicates fraction, principally for metals, which can be measured as either total or dissolved	Text String	Yes
Standard Name	Name of standard identified in this record. Multiple standards may be stored for a single constituent / media / fraction combination, as long as they have a unique Standard Name.	Text String	No
Standard	Standard value used in customized formatting in data tables when the standard has been exceeded.	Numeric - Floating Point	No
Standard Min	Lower limit of regulatory standard, such as the value in an acceptable pH range.	Numeric - Floating Point	No
Equivalent Weight	For conversion to equivalent-based concentration used in Stiff Diagrams, Piper Diagrams, Durov Charts, and Schoeller Diagrams. Negative value should be used for anions and positive values for cations. May enter zero for compounds not to be plotted in either a Stiff or Piper Diagram.	Numeric - Floating Point	No (unless plotting geochemistry charts)