90.93 Standard confirmed Jul 11, 2022
ISO
ISO/TC 147/SC 2 Physical, chemical and biochemical methods
International Standard
13.060.50 Examination of water for chemical substances
The procedure specified can be applied for phytoplankton in natural surface waters and for testing algal growth in bio-assays. Using appropriate sampling it can also be applied to phytobenthic communities. The principle is collection of algae by filtration, extraction of algal pigments, spectrometric determination of the chlorophyll-a concentration in the extract, evaluation of the chlorophyll-a and phaeopigment concentration from the difference of absorbance at 665 nm prior to and after acidification of the extract.
PUBLISHED
ISO 10260:1992
90.93
Standard confirmed
Jul 11, 2022