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Types and Abundance of Microplastics in Seawater and Sediment at Padang Beach Tourism Area, West Sumatra, Indonesia
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Scientists tested the water and sand at a popular Indonesian beach and found tiny plastic particles, called microplastics, almost everywhere, from crowded tourist spots to quieter areas. These plastic bits, made from materials like polyester and polystyrene, come in many shapes, sizes, and colors, showing just how widespread plastic pollution has become even in places people swim and relax. While this study didn't test direct health effects, it's a reminder that the microplastics we're exposed to at the beach, and that end up in seafood, are a growing part of daily life worth paying attention to.
The Padang Beach Tourism Area is a popular destination in Padang City making it susceptible to contamination by microplastics. From April to June 2023, we sampled seawater and sediment for microplastics from eight stations having varying degrees of human influence, including densely populated areas, river estuaries, tourist areas, and sparsely populated areas. We analyzed the samples to determine abundance, shape, size, color, and composition. Five shapes (fibers, films, fragments, granules, and pellets), seven colors (black, blue, brown, red, transparent, green, and white), and eight compositons (polycarbonate, polypropylene, polyethylene, polysulfone, polyvinyl chloride, polyethylene terephthalate, polystyrene, and polytetrafluoroethylene) were identified and categorized into five size ranges (1-100 µm, 100-300 µm, 300-500 µm, 500-1000 µm, and 1-5 mm). Microplastics abundance in seawater was not significantly different across stations, ranging from 0.064 to 0.229 particles/m3. Microplastic abundance in sediment, was also not significantly different across stations, ranging from 0.151 to 0.387 particles/kg. However, there was a significant difference between the abundance of microplastics in seawater and sediment. The highest abundance of microplastics was in the form of fragments, and there was significant difference from fiber, fragment, pellet, and granule types. In contrast, thre was a significant difference between the abundance of film-type microplastics in seawater and sediment. Overall, microplastic abundance was similar across densely populated areas, river estuaries, and tourist areas and higher than in sparsely populated areas.
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