Quick guide to ICP as a base line for Po4 and No3
There has been a lot on the group chat on this issue Focustronic would like to give you all the information so you can see the issues and what the outcome can be. ICP cannot measure PO4, as ICP only measure atoms. ICP is awesome when coming to measure traces and macros (with very high accuracy), consisting of only one atom, like Sr, K, Be, Br, I, etc. Also, as an atom can never disappear those parameters from an ICP are not time sensitive.