Ecotoxicological Effects of the Anionic Surfactant Sodium Dodecyl Sulfate (SDS) in Two Marine Primary Producers: <i>Phaeodactylum tricornutum</i> and <i>Ulva lactuca</i>.

lactuca first displayed a negative trend at 1 mg L −1 , the growth rate was significantly stimulated at high SDS concentrations (3 and 10 mg L −1 ).

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On the other hand, the red/far-red fluorescence ratio (F 685 /F 735 ; Figure 5 D), which varies inversely with chlorophyll content, showed no significant changes (although presenting a decreasing trend with increasing SDS concentration), and the wavelength of the maximum fluorescence in the red region (WL Fmax ; Figure 5 E) showed a significant decrease only when exposed to an SDS concentration of 3 mg L −1 . 3.3.

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