I have chemical analyses of groundwater samples (I got the analyses from a previous study) and I want to work with it in my master thesis.

In these analyses, phosphate concentration is mentioned in micrograms/liter and it seems phosphate was analysed by means of IC-ICP-MS.

My question is: When measuring phosphate concentration (orthophosphate) either using IC-ICP-MS or any other method as HACH Method 8114, do we measure the three species $\ce{PO4^{-3},HPO4^{-2}}$, and $\ce{H2PO4^{-1}}$ together and report the result as phosphate or we measure just $\ce{PO4^{-3}}$?

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    $\begingroup$ Not sure exactly how or what analysis was done. In general phosphate in ug/l would be for all species $\ce{H2PO4^-, HPO4^{2-}, \text{ and } PO4^{3-}}$. Again I'd expect that the ground water had a pH from which you could calculate the fraction of each of the species. $\endgroup$ – MaxW Dec 14 '17 at 17:20

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