Why is dissolved inorganic phosphorus called soluble reactive phosphorus (SRP) instead of dissolved inorganic phosphorus (DIP)?

Seems to me that DIP would be much more clear.

See e.g. General Information on Phosphorus (City of Boulder/USGS Water Quality Monitoring)

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    $\begingroup$ SRP reflects how the phosphorus is measured in the laboratory: you look which fraction of the dissolved phosphorus compounds is reactive. Commonly, this reactive fraction is the inorganic phosphorus (=> DIP). My information from colleagues, who measure phosphorus compounds in river and marine water, is that one should use the abbreviations DIP, DOP, PIP, and POP (dissolve/particulate inorganic/organic phosphorus) nowadays because the nomenclature is more consistent. However, from the perspective of someone working in the laboratory, SRP describes what is actually measured. $\endgroup$ – daniel.neumann Feb 14 '18 at 13:55

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