ANALISIS KANDUNGAN MIKROPLASTIK PADA AIR LAUT DAN SEDIMEN DI KAWASAN WISATA PANTAI GANDORIAH PARIAMAN

Gandoriah Beach is the tourist destination in Pariaman, West Sumatera, located near the Indian Ocean and has several activities that potentially generate microplastics. This study aims to analyze the content of microplastics in the water and sediment of Gandoriah Beach, and to determine the correlation and effect of of waste generation rate, pH, and temperature on the concentration of microplastics. The analysis of microplastic were the concentration, shape, color, size, and type of polymer. Microplastic concentration was analyzed using the gravimetric method. The shape, color, and size of microplastics were analyzed using a microscope. The type of polymer was analyzed using the FTIR spectroscopy method. The results showed that the average plastic waste generation of Gandoriah Beach was 0.11 kg/m 2 /day or 0.85 L/m2 /day. The average microplastic concentration was 86.67-165 particles/L in water and 52.52-107 particles/kg in sediment. The shape of microplastics was dominated by fiber (49% in water and 37% in sediment). The most frequently found color was black (37%) in water and transparent (39%) in sediment. The most size of the microplastics was small microplastic (53% in water and 64% in sediment). The dominant polymer type was LDPE (25% in water and 41% in sediment). ANOVA test showed that different locations and sampling times showed no significant difference to the microplastic concentrations (p>0.05). The analysis of correlation showed a strong relationship between plastic waste generation to the microplastic concentration in sediment (r=0.775), a very weak relationship between pH to microplastic concentration (r=-0.342), and a weak relationship between temperature with microplastic concentration (r=0.437). The regression analysis, influence of plastic waste generation, pH, and temperature to the microplastic concentration were 60.1%, 11.7%, and 19.1% respectively