Occurrence characteristics and ecological risk assessment of microplastics in surface seawater of nearshore mariculture area in Rushan
A mariculture area near the shore of Rushan city was taken an example to establish an efficient assessment of ecological risk of the microplastics based on the abundance and composition of in-situ microplastics in the surface water,which were detected by the stereomicroscopy and laser direct infrared techniques,and evaluated by the specie sensitivity distribution model.The results in present study showed that the microplastics with those characteristics of blue/transparent,fiber,and the size less than 500 µm were predominant.The averaged abundance of the microplastics were(1.08±0.41)n/L ranging from 0.42 to 1.72n/L.Among various types of polymers,the chlorinated polyisoprene(CPI),polyurethane(PU),polyamide(PA),and polyethylene terephthalate(PET)were most common.The no-effect concentration of non-spherical microplastics(fiber and fragment)in the seawater was estimated as 4.47n/L with the toxicity data and specie sensitivity distribution model.It revealed that the risk of microplastic pollution in the investigated mariculture area was significantly lower than that of the hazard warning abundance,but the plastics with high chemical toxicity flowing into the sea was urgently needed to be avoided.
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