BS EN ISO 20227:2017

This standard BS EN ISO 20227:2017 Water quality. Determination of the growth inhibition effects of waste waters, natural waters and chemicals on the duckweed Spirodela polyrhiza. Method using a stock culture independent microbiotest is classified in these ICS categories:

• 13.060.70 Examination of biological properties of water

This document specifies a method for the determination of the inhibition of the growth of the first fronds of Spirodela polyrhiza germinated from turions, by substances and mixtures contained in water or waste water, including treated municipal waste water and industrial effluents.

The test is also applicable to pure chemicals and in particular, plant protection products and pesticides.