"Light absorbance (647nm wavelength) by the suspended particulate material >GF/F [pigment phase] by filtration and spectrophotometry on residue before and after NaOCl bleaching and differencing of the measurements"@en . "1" . . "SPMPigAbs647" . "PIGNA647" . "Unavailable" . "accepted" . "PIGNA647" . "PIGNA647" . "1" . "22-JAN-09" . .