Kép forrása BME ABÉT Leírás szerzője VE 50-50 ml control and test water sample is introduced into each beaker, 10-10 pcs of 2-frond, green coloured duckweed is put on top into each beaker. Duckweed (Lemna minor) growth inhibition test (based on frond counts and chlorophyll content) for ecotoxicity assessment of water samples (surface and groundwater, leachate and waste water) according to OECD 221