PROFILE OF TOTAL PETROLEUM HYDROCARBONS IN THE WATER AND SEDIMENT COLUMNS OF THE ORASHI RIVER.......

Samples were taken at two-month intervals from December 2019 to June 2020 from the Orashi River's water and sediment columns, and then tested for total petroleum hydrocarbon concentrations and the source of the river's petroleum hydrocarbon contamination. Before sample analysis and detection of total petroleum hydrocarbon components using a Gas Chromatography-Flame Ionization Detector, laboratory pretreatment of samples, extraction techniques, and gas chromatography clean-up methods were carefully followed (GC-FID). The total petroleum hydrocarbons components found in the river's water and sediments were from the C8-C40 fractions. Total petroleum hydrocarbon concentrations in the river's water ranged from 5.844 to 16.888 mg/L, while those in the sediments ranged from 16.655 to 50.504 mg/kg. The C15-C19 odd numbered hydrocarbons, C18-C22 even numbered hydrocarbons, LMW/HMW, LHC/SHC, C31/C19 ratios, and the CPI and ACL indices were used to determine the source of total petroleum hydrocarbons contamination in the river. As a result, control and regulatory measures must be implemented to prevent activities that result in total petroleum hydrocarbons being present in the river, in order to protect human health and aquatic flora and wildlife within the river and its environs.

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