Lemna (duckweed) as an indicator of water pollution. I. The sensitivity of Lemna paucicostata to heavy metals.

The environmental conditions affecting the growth and multiplication of Lemna paucicostata in the presence of heavy metals were examined to establish a phytometer method for water pollution using the duckweed, Lemna. The pH of the medium, concentration, and composition of the nutrient in the medium, and the temperature at which cultures were maintained, were found to affect the sensitivity of Lemna to heavy metals. Therefore, if the growth and multiplication of Lemna is maintained by a Bonner-Devirian's medium (pH 6.1, 7.1) above 25 degrees C, heavy metals can be detected in water.