"Concentration standard deviation of phaeophytin per unit volume of the water body [particulate >GF/F phase] by filtration, acetone extraction and high performance liquid chromatography (HPLC)"@en . . "PTZZSDP1" . "The standard deviation of a set of measurements of the amount (mass or moles) of the specified pigment determined by HPLC assay of a sample collected by dissolution in acetone of the residue collected by GF/F filtration of a known volume of any water body." . .