HIIII,
As I know, there are standard chemicals for UV/AAS i.e: Pb, As, Cu...
But with ion: Fe2+, Fe3+, Cl -, SO4 2, NO2 -, NO3 -, NH4 +, S 2-, Cr 3+, Cr tong, As, Fe 2+, Fe 3+, COD .. Are there standard ion for analysing them in a water sample or crude oil sample? and Where I could buy or order them?
thanks and best regards,