Skip to main content

Vocabulary Term Details

Soluble unreactive phosphorus

Definition (

This phosphorus fraction contains filterable phosphorus forms that do not react with the phosphorus reagents under the time and conditions of the test. It is measured as the difference between soluble phosphorus (SP) and Soluble Reactive Phosphorus (SRP). The compounds in the SUP fraction are organic forms of phosphorus and chains of inorganic phosphorus molecules termed polyphosphates. The size of this fraction relative to the other phosphorus fractions is highly dependent on the type of filter used to separate the soluble from particulate fractions. (Secchi Dipin)

Preferred Units: N/A

Scope Note:

Broader TermsNarrower TermsRelated Terms
Total dissolved phosphorus
Dissolved organic phosphorus
Soluble phosphorus

This term is used for the following terms: 

Approved Date

Items having a keyword or observed-property relationship to this subject term

Click here to give feedback on this term or suggest an update.