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Analysis of Microplastics Abundance in Selorejo Reservoir Sediment at Malang Regency
Summary
This study analyzed the abundance, type, size, color, and distribution of microplastics in sediments of Selorejo Reservoir in Malang Regency, Indonesia. Fragment-type microplastics (42%) in the 125–250 µm size range (48%) and black color (46%) were dominant, with an overall average abundance of 56,637.5 particles per kilogram of sediment. The highest concentrations were found at the reservoir outlet, and FTIR analysis was used to identify polymer compositions.
Plastic waste is a problem that has the potential to pollute the environment and can be asource of problems for waters. Microplastics that enter the waters will enter the water body and will eventually settle in the sediment. This study aims to determine the abundance based on the type, size, color and number of microplastics, to determine the comparison of the abundance of microplastics in sediments at each station and to determine the abundance of microplastics based on the pollutant source, to make a distribution map of the presence of microplastics in the Selorejo Reservoir and to analyze the abundance of microplastics based on pollutant sources in the area. Selorejo Reservoir. The results of the study revealed that in the Selorejo Reservoir sediment the most dominant type of microplastic was fragment (42%), based on color it was black (46%), and based on size was microplastic with a size of 125-250 m (48%). Overall the abundance of microplastics in the Selorejo Reservoir is 56637.5 particles/kg sediment where the abundance is high on grid 8 where the grid is the outlet of the Selorejo Reservoir. The results of the Fourier Transform Infrared (FTIR) analysis on sediment samples showed several polymers, namely polyethylene (PE), polystyrene (PS), polyprophylene (PP), and polyamide (PA) ornylon.