Analisis Kualitas Air dan Kandungan Logam Berat Kromium (Cr) Pada Air, Sedimen, dan Daging Ikan Nila (Oreochromis niloticus Linn.) di Sungai Premulung Kota Surakarta

ABSTRACT River is a lotic ecosystem, which is crucial for the survival of living beings such as aquatic habitat, drainage channels, and water sources for human needs. Premulung River is a river crossing in the city of Surakarta. On the edge of the river were surrounded by settlements, markets, industrial textiles, batik, silk screening and hospitals, which produced wastes that potentially contaminate and degrade water quality. This research aimed to analyze the water quality and determinate the heavy metal content of Chromium (Cr) in the water, sediment, and meat of tilapia (Oreochromis niloticus Linn.) in Premulung River Surakarta, and the correlation between Cr content in water, sediment and meat of tilapia. This research was conducted by field observations in three stations, on the river that flow under Kleco, Griyan, and Jongke Bridges. The parameters data of temperature, TDS, pH, DO, BOD, COD, and Cr water were compared using PPRI No. 82 of 2001 (water quality class 2); Cr sediment was compared using ANZECC 2000; Cr fish meat was compared using CFSA 2012. Water quality was analyzed using STORET method, while the correlation between Cr content in water, sediment and fish meat were analyzed by Pearson correlation. The results indicated that the water quality of Premulung River Surakarta currently on the quality of being moderate contaminated. Heavy metal Cr content in Premulung river water was (not detected up to 0,0344) mg/L and Cr content in sediment (1,307 up to 4,948) mg/kg below from minimum boundary, while Cr content in meat of tilapia (1,958 up to 3,535) mg/kg exceeded the quality standards. The correlation of Cr content in water was strong directly proportional to the Cr fish meat (r = 0,997), while Cr content in sediment showed moderate inversely correlation to Cr fish meat (r = -0,470). Keywords: Water quality, Chromium (Cr), Oreochromis niloticus, Premulung River