Emiliania huxleyi was generally more sensitive than Chlorella vulgaris to surrogate NAs.
Surrogate NAs at 10–50 mg L−1 inhibited FV/FM and growth in E. huxleyi but not C. vulgaris.
FV/FM in C. vulgaris and E. huxleyi was not inhibited by the AEO fraction of OSPW.
The AEO fraction of OSPW at ≥10 mg L−1 stimulated cell growth in E. huxleyi.