KANDUNGAN LOGAM BERAT Pb Cu DAN Hg PADA IKAN GAGOK (Mystus wolffii) DI SUNGAI MAHAKAM DESA JEMBAYAN KECAMATAN LOA KULU KABUPATEN KUTAI KARTANEGARA KALTIM

Abstract

The Mahakam River is the largest river that divides the province of East Kalimantan, where its flow circles the areas of Kutai Kartanegara Regency, Kutai Barat Regency and Samarinda City. Community activities such as household activities, plantations, fishery cultivation and mining are daily activities along the river. The existence of Gagok fish (Mystus wolffii) which is easily found by the community as a result of their daily catch in the Mahakam had been made an object used as an indicator organism of heavy metal pollution due to activities along the river. This research was conducted for 6 months, at 5 stations based on where the Gagok fish (Mystus wolffii) was caught by analyzing the heavy metal content in the gills, kidneys and meat of Gagok fish (Mystus wolffii) and related to the influence of water quality using atomic absorption analysis (AAS) and Chi-square test. The conclusion showed that the heavy metal content found in the kidneys was dominated by Cu with a value ranging from 0.33 mg / kg - 0.76 mg / kg, in the gills was dominated by Pb, with a value ranging from 0.34 mg / kg - 0.90 mg / kg, and in the meat the Pb and Cu values were not dominant, while Hg was not found in all parts. However, after being compared with the metal quality standard in organisms (SK Dirjen POM no 072/B/SK/VII/89) it is below the maximum contamination limit.