Does converting a measurement from PO?-P to PO? give the total phosphorus reading?

Document ID

Document ID TE369

Published Date

Published Date 27/05/2017
Question
Does converting a measurement from PO?-P to PO? give the total phosphorus reading?
Summary
Does converting a measurement from PO₄-P to PO₄ give the total phosphorus reading?
Answer
No, converting from PO₄-P to PO₄ does not give the Total phosphorus reading. Total phosphate is the sum of organic and inorganic forms of phosphate and requires a digestion using heat, acid and persulfate to convert organic and condensed phosphates to orthophosphate for measurement.