

FOLLOWUS
1.Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
2.College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
mengfanping@ouc.edu.cn
Received:08 October 2023,
Online First:27 November 2023,
Published:01 July 2024
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CUI Jiali,DU Shuhao,LI Yumei,et al.Effects of inorganic nutrients and environmental factors on the removal of n-propylbenzene and isopropylbenzene in seawater by cryptophytes Rhinomonasreticulata S6A[J].Journal of Oceanology and Limnology,2024,42(04):1200-1215.
To effectively remove
n
-propylbenzene (n-PBZ) and isopropylbenzene (i-PBZ) leaked into seawater using
Rhinomonas
reticulata
S6A (a newly isolated marine microalga)
the effects of three inorganic nutrients and four environmental factors on their degradation were determined after 7 d of inoculation. Results show that NaNO
3
at 300 mg/L caused a higher removal efficiency of both n-PBZ and i-PBZ (44.79% and 39.26%)
while for NaH
2
PO
4
·H
2
O
greater removal rates of two PBZs (47.30% and 42.23%) were achieved at 30 and 20 mg/L
respectively. NaHCO
3
supplementation (500–750 mg/L) resulted in a large reduction (43.67%–45.04%) in i-PBZ concentration. The change in seawater pH (from 6 to 9) did not affect the elimination of n-PBZ and i-PBZ. The most suitable salinity and temperature were 30 and 25–30 °C
respectively
leading to the PBZs removal of ~40%. Light intensity exhibited significant influence on elimination of PBZs
and the maximum removal efficiencies of 56.07% (n-PBZ) and 55.00% (i-PBZ) were recorded under 200 and 600 μmol/(m
2
·s)
respectively. In addition
the microalga could still remove PBZs when it failed to grow well due to darkness
strong light
low temperature
or low salinity
which might mean that good growth of alga is not always a necessary condition for PBZs removal. Therefore
attention should be paid to the suitability of nutrient levels and environmental cond
itions (excluding pH) in seawater when using microalgae for bioremediating PBZs-contaminated seawater.
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