INHIBITION EFFECT OF THE ANIONIC SURFACTANT SDS ON DUCKWEED, LEMNA-MINOR WITH CONSIDERATIONS OF GROWTH AND ACCUMULATION

Authors
Citation
N. Dirilgen et N. Ince, INHIBITION EFFECT OF THE ANIONIC SURFACTANT SDS ON DUCKWEED, LEMNA-MINOR WITH CONSIDERATIONS OF GROWTH AND ACCUMULATION, Chemosphere, 31(9), 1995, pp. 4185-4196
Citations number
31
Categorie Soggetti
Environmental Sciences
Journal title
ISSN journal
00456535
Volume
31
Issue
9
Year of publication
1995
Pages
4185 - 4196
Database
ISI
SICI code
0045-6535(1995)31:9<4185:IEOTAS>2.0.ZU;2-U
Abstract
The growth inhibiting and accumulation effects of sodium dodecyl sulph ate (SDS) on Lemna minor L. were tested at 1-300 ppm levels both in th e full-strength and 1/10-diluted Jacob's nutrient media under continuo us illumination at 26-30 degrees C for a 7-day experimental period. Th e growth of Lemna minor L. was enhanced by increasing concentrations o f SDS between 1 and 40 ppm and inhibited thereafter, while no response was observed when the concentration reached a value of 100 ppm. On th e contrary, the growth in 1/10-diluted medium was observed to be sligh tly enhanced up to concentrations of 40 ppm, but more so between 40-80 ppm SDS; exhibiting a sharp inhibition, thereafter. The accumulation of SDS by Lemna minor L. (expressed on dry weight basis) increased wit h increasing concentrations of SDS between 1-90 ppm, both in full-stre ngth aid 1/10-diluted media. The correlation of increasing SDS concent rations with growth and accumulation were determined by using linear a nd non-linear regression analysis. The statistical significance of obs erved differences in full-strength and diluted media were also investi gated. pH of both full-strength and diluted media at 1-90 ppm of SDS l evels increased during the test: period and remained constant at highe r SDS concentrations. This indicated that the biodegradation of SDS ge nerated the alkaline intermediates in the medium.