PAHs are mutagenic and carcinogenic agents that influence the coastal water of Tarakan City. This study aims to determine the concentration, type, and distribution of PAHs in waters and sediments of rivers, seawater, and brackish ponds, and their potential sources. Fourteen samples of water and sediment from selected stations obtained 14 types of PAHs priority (USEPA). Analysis using GC-MS Type Thermo Trace 1310 single quadrupole Mass Spectrometer, using Coulum melting silica column (coulumn fused silica) DB5 MS with a length of 30 m, a diameter of 0.32 mm inline. The concentration in sediments at river locations ranges from 0.72-352.84, between 1.23-606.74 in the sea, and brackish ponds 0.08-2858.88 ng.g-1. On the waters ranged from 42.46-160.25 µg.L-1, in the sea 7.95-167.55 µg.L-1 and ponds 7.63-151.60 µg.L-1. The concentration level in rivers and seas is small and in the ponds is small-very high. The concentration on water at the river site was observed to increase from upstream to downstream. Meanwhile in sediment was higher in the upstream decreased towards the middle of river and increased in downstream/estuary area. The concentration in the Tarakan coastal environment signifies the potential hazards to the environment. Components Nap, Fla, Pyr, Chr, and BaP are types that are often identified. Furthermore, two, four and five rings of PAHs were shown to dominate in water and sediment, with the major rings present in both river and brackish pond. The PAHs were both petrogenic and pyrolytic sources from land base sources that were possibly derived from the Pamusian river.

Sembakung River is one of the important river ecosystems in North Kalimantan. Based on the parent material, the soils along the Sembakung river basin consist of peat soil and mineral soil. With its unique characteristics, this river has quite high potential resources in public waters, especially fish and other aquatic biota. The purpose of this study was to identify and identify the diversity of freshwater fish species that exist in peatland areas. Found 11 types of fish along the Sembakung River. These fish species come from Familia Siluridae, Cyprinidae, Cannidae, Eleotridae, Pangasiidae, Bagridae and Helostomatidae. The highest relative abundance (Kr) was the Salap beruntus (Barbonymus gornionotus). The most common type of fish found (Fi) was white Lais fish, 58.3% Fi and the least common were Toman (Channa micropelte), black Betutu (Oxyeleotris selheimi) and Red Betutu (Oxyeleotris marmorata).

PAHs are mutagenic and carcinogenic. Concentrations at certain levels in water and sediments can be toxic to benthic and pelagic marine organisms. The extent of the presence and distribution of PAHs in the aquatic environment in the coastal area of Tarakan City has not been answered. The purpose of this study was to analyze its presence and distribution in the coastal environment of Tarakan City. The samples used were water and sediment samples. Determination of the sampling location at sea, considering the type of activity, very dense (West and South) Tanjung, moderate activity (North) and infrequent activity (East). Analysis of the types of PAHs of all samples was carried out using GC-MS type Thermo Trace 1310 Single quadrupole Mass Spectrometer, Coulum GC-MS and determination of distribution pattern using Ocean Data View (ODV) software. PAHs were found in the sea waters of Tarakan City. Its distribution is widespread in all water locations. Cyclic chain types 2, 4 and 5 were found at each location. Cyclic chain type 3 is only found in dense and infrequent representational locations. Meanwhile, the cyclic chain type 6 was only found at the location of moderate activity. The concentration of PAHs in the sea waters of Tarakan City is still lower than some locations in the world.