
Keywords: Molybdenum blue reaction; Orthophosphate; Dissolved reactive phosphorus; Phosphomolybdate(br), Broad absorption band; (sh), Absorption shoulder; 12-MPA, 12-Molybdophosphoric acid (H3PMo12O40); 11-MPA, 11-Molybdophosphoric acid (H3PMo11O37); 12-MSA, 12-Mol