The removal of PCA by three marine macroalgae and the photosynthetical responses
三种大型海藻对对氯苯胺的去除行为及光合生理响应

This study investigated the removal of different concentrations of PCA in seawater under simulation experiments with three marine macroalgae, Gracilaria lemaneiformis,Porphyra haitanensis and Ulva lactuca. The results showed that, after 7 days' experiment, the final removal rate with respect to 6 mg·L-1 PCA was 58.7% by Gracilaria lemaneiformis, 75.7% by Porphyra haitanensis, and 94.9% by Ulva lactuca. For 60 mg·L-1 PCA, the final removal rate was 50.2% by Gracilaria lemaneiformis, 74.9% by Porphyra haitanensis, and 61.3% by Ulva lactuca. The greater the cultivation density of algae was, the better the PCA removal. The response of growth, photosynthesis, respiration and biochemical components exposed to different concentrations of PCA in Ulva lactuca was also studied in this paper. Five different concentrations of PCA (0, 1, 5, 10, 25 mg·L-1) were adopted. The results showed that the growth of Ulva lactuca was negatively affected by PCA and the relative growth of Ulva lactuca decreased with the increasing of PCA. In the treatment of PCA, effective quantum efficiencies (Yield), photosynthesis and respiration of Ulva lactuca were significantly enhanced at low concentrations (<5 mg·L-1) while was inhibited at high concentrations (>10 mg·L-1). The contents of pigments and solube proteins in Ulva lactuca were not significantly affected by PCA. The results suggested that reduced growth could be mainly ascribed to the increased respiration rates.