12. STUDY ON PLASTIC WASTE STATUS IN MANGROVE FORESTS AT THE COASTAL AREA OF HAU LOC DISTRICT, THANH HOA PROVINCE

Tóm tắt

Plastic is one of the most handy materials that man has ever invented. With its cheap, durable, and convenient properties, plastic is used in almost all areas of life. Along with economic development, plastic waste is becoming a big challenge for the community and society, significantly affecting the environment, public health and marine ecosystems, including mangrove forests. Studies on marine plastic waste now mainly focus on the number of plastic waste collected without concentrating on the composition, nature, and fluctuations of plastic waste accumulation over time and season. Therefore, by the methods of sampling, determining volume and composition and moisture content of each group of plastic waste, the study was conducted in the mangrove forest at Da Loc commune, Hau Loc district, Thanh Hoa province. The research results showed that the average volume of plastic waste in the 1^st sample collection was 14.64g/m², 3.47g/m², 15.02g/m³ and 5.88g/m² in the 2^nd, 3^rd and 4^th sampling times, respectively. The average density of plastic waste in mangroves was 0.93 items/m² and 0.25 items/m²at the 1^st and 2^nd sample collection in the winter season. Whereas in the summer, the average density of plastic waste in the mangroves is 0.74 items/m² and 0.54 items/m² in 3^rd and 4^th sample collections. LDPE was the dominant component in mangroves at each sampling period, the LDPE’s volume ranges from 0.81g/m² to 7.59g/m² on average, followed by PP with an average volume of 1.55g/m² - 7.0g/m², the third was PVC with an average volume from 0.12g/m² - 2.54g/m², followed by PET (0.14g/m² - 1.09g/m²), PS (0.02g/m² - 0.79g/m²). HDPE and OTHERS were not found in the mangrove during sampling sessions. And there was no more different moisture content of different types of plastic waste among samples collected in the mangrove