한국 남해 거제만 주변의 해양 부유 미세플라스틱

Abstract

Floating microplastic was determined in terms of abundance, distribution and characteristics around Nakdong River mouth in the Southern Sea of Korea. Surveys were carried out in 29th-30th May during dry period and 23rd-24th July after rainy season using Manta-trawl net with 330 ㎛mesh and hand net with 50 ㎛mesh. Particles were classified into expanded polystyrene (EPS), fragment of hard plastic (Fragment), fibrous particles (Fiber) and other forms based on physical form. And size classes were selected as <2㎜, 2-10㎜, 10-25㎜, and >25㎜. Particles quantity varied with ranges of 0.62-56.91 particles/m3 (May) and 0.64-860.86 particles/m3 (July) by trawls, ranges of 260-1,410 particles/m3 (May) and 210-15,850 particles/m3 (July) by hand net. The maximum abundance from particles by trawls occurred at size class of 2-10㎜ dominated by EPS of which relative abundance increased from 54.28% (May) to 87.29% (July). From particles by handnet, EPS at sizes of 2-10㎜ increased from 140 to 7,820 particles/3 which relative abundance was less than 30% during surveys. Sizes of <2㎜ from particles by handnet accounted for 97.53% (May) and 68.52% (July) consisting of fragments and fibers. From sizes < 2㎜ showing wide range of occurrence, mean abundances of fiber, hard plastics and EPS from trawl samples were higher after rainy season than those during dry season, whereas those of fiber and EPS from handnet samples increased in July season using Manta-trawl net with 330 ㎛mesh and hand net with 50 ㎛mesh. Particles were classified into expanded polystyrene (EPS), fragment of hard plastic (Fragment), fibrous particles (Fiber) and other forms based on physical form. And size classes were selected as <2㎜, 2-10㎜, 10-25㎜, and >25㎜. Particles quantity varied with ranges of 0.62-56.91 particles/m3 (May) and 0.64-860.86 particles/m3 (July) by trawls, ranges of 260-1,410 particles/m3 (May) and 210-15,850 particles/m3 (July) by hand net. The maximum abundance from particles by trawls occurred at size class of 2-10㎜ dominated by EPS of which relative abundance increased from 54.28% (May) to 87.29% (July). From particles by handnet, EPS at sizes of 2-10㎜ increased from 140 to 7,820 particles/3 which relative abundance was less than 30% during surveys. Sizes of <2㎜ from particles by handnet accounted for 97.53% (May) and 68.52% (July) consisting of fragments and fibers. From sizes < 2㎜ showing wide range of occurrence, mean abundances of fiber, hard plastics and EPS from trawl samples were higher after rainy season than those during dry season, whereas those of fiber and EPS from handnet samples increased in July