DIN EN ISO 20227 E:2016-06 Water quality Determination of the growth inhibitory effects of wastewaters, natural waters and chemicals on the duckweed Spirodela polyrhiza using a method for microbial testing independent of storage culture (draft)
2017DIN EN ISO 20227:2017-10 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 (ISO 20227:2017); German version EN ISO 20227:2017
2017DIN 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 (ISO 20227:2017)
1970DIN EN ISO 20227 E:2016-06 Water quality Determination of the growth inhibitory effects of wastewaters, natural waters and chemicals on the duckweed Spirodela polyrhiza using a method for microbial testing independent of storage culture (draft)