Phytotoxicity tests of a textile factory effluent with common duckweed(Lemnagibba)

Document Type : Research Paper


1 M.A Degree of Ecology Kermanshah University

2 Assistant Professor, Department of Biology, Ilam University

3 Assistant Professor, Department of Biology, Kermanshah University

4 Expert of biology, Department of Biology, Payam Noor University ,Ilam


     A textile factory discharges its effluent into GamasiabRiver without any treatment. In order to evaluate environmental side effects of this factory a routine phyto test was conducted with the common duckweed (Lemnagibba). The duckweed in the Hogland solution was exposed to series of concentration of the factory effluent In this study Lemnagibba was exposure to five different concentration of textile effluent for 7 days. Plant growth response was measured by two methods: counting the number of fronds and measuring the chlorophyll content (chlorophyll a, b and total chlorophyll) of the duckweed. MC50 values was calculating in 3,5 and 7 days. 3 days: 77.77ml/l, 5 days 59.7ml/l, 7 days 69.34ml/l. Single factor analysis of variance (ANOVA) showed that in all of concentrations, difference in the values of total chlorophyll content and chlorophyll a were significantly (0.05≥0) different with those of control. Similarly, difference number of fronds was significant (0.05≥0) only in 7 day.