Distribution Characteristics and Risk Assessmentof Micro-plastics in the Surface Water of the Costal Area in Nantong
The monitoring of micro-plastics in the surface seawater of Nantong coastal area provided a basis for the traceability of micro-plastics,and provided technical support for the assessment of the environmental risk of micro-plastics.In this study,the micro-plastic samples were collected from the nearshore of Nantong Cityusing the trawl method.The abundance,morphological characteristics,and compositional distribution of micro-plastics were analyzed.The results showed that the average abundance of micro-plastics in the surface seawater of the nearshore ranged from 0.07n/m3 with a distribution range of 0.01n/m3 to 0.16n/m3.The particle size of micro-plastics was mainly 1～5 mm accounted for 67.1 per cent of the total indicating significant potential marine ecological hazards.In general,the proportion of film was the highest 38.3％,and the color was mainly white,green and transparent,accounting for 82.2％of the total.There were 11 types of micro-plastics.The main component was polyethylene,which accounted for 52.1％of the total size,followed by Polypropylene(13.7％)and cellulose(11.0％).The risk assessment resultsshowed that the chemical hazard of polymer was at the higher risk level(Ⅲ)and the pollution load of micro-plastics was at the low risk level(Ⅰ).The abundance of micro-plastics of Nantong was at a lower level compared with the coastal areas of other coastal cities in China,and the distribution was not uniform among the points;the sources of micro-plastics among different water bodies are greatly affected by human activities in the neighboring land area presenting a certain regional characteristics.While reducing the emission of plastics,the entry of high-toxicity plastics into the environment should be strictly controlled.
micro-plasticssurface seawaterdistribution characteristicsrisk assessmentcostal area of Nantong
万方数据
维普
