Occurrence and distribution of microplastics in surface sediments from the Gulf of Thailand. (March 2020)

• Record Type: Journal Article
• Authors: Wang, Ying; Zou, Xinqing; Peng, Cong; Qiao, Shuqing; Wang, Teng; Yu, Wenwen; Khokiattiwong, Somkiat; Kornkanitnan, Narumol
• Is Part Of: Marine pollution bulletin. Volume 152(2020)
• Publication Date: 2020-03
• Subjects: Microplastic -- Pollution -- Surface sediments -- Gulf of Thailand -- Grain size -- Pollution sources; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2020.110916
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: This study investigated the distribution and characteristics of microplastics in surface sediments of the Gulf of Thailand (GoT), and discussed the correlation between sediment grain size and microplastic content. The results indicate the abundance of microplastics is 150.4 ± 86.2 pieces/kg dry weight, representing a medium microplastic pollution level compared to other sea areas. Small microplastics (0.5–1 mm) take up >70% of total microplastic numbers. Fibrous microplastics are the dominant component of microplastics. According to micro-Fourier transform infrared spectroscopy, rayon (37%) and polyester (PES: 16%) are the most typical polymer types found in sediments. The results imply that secondary microplastics are the dominant pollutant, while fibrous microplastics are mainly from municipal sewage discharge. We also find that inconspicuous correlation between grain size and microplastics, which is caused by the multi-sources and different flow field. This study deepens our understanding of the environmental risks posed by microplastics to marine ecosystems in the GoT. Highlights: Gulf of Thailand has medium plastic pollution level compared to surrounding areas. Small microplastics (0.5–1 mm) dominate the microplastic share. Fibrous microplastics are the dominant component in sediments. Rayon and polyester are most common polymers found in sediments.