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Perairan delta Cimanuk terletak di muara sungai terpanjang kedua di Jawa Barat yaitu Sungai Cimanuk yang bermuara ke Laut Jawa di pesisir Indramayu. Limbah rumah tangga dan industri yang dibawa melalui Sungai Cimanuk berpotensi menjadi ancaman cemaran khususnya senyawa minyak dan lemak (Oil and Grease/OG). Aktivitas lalu lintas kapal penangkap ikan di pangkalan pendaratan ikan (PPI) dan pelabuhan perikanan (PP) di sekitar perairan sangat berpotensi menambah beban kontaminasi. Kontaminan minyak dan lemak (OG) berasal dari limbah yang berupa lemak hewani, nabati dan total petroleum hidrokarbon (TPH). Tujuan penelitian ini untuk mengestimasi konsentrasi dan distribusi spasial TPH dalam sedimen di perairan muara DAS Cimanuk berdasarkan kadar OG, dan mengidentifikasi sebaran wilayah yang tercemar TPH di perairan delta Cimanuk. Analisis OG dilakukan dengan alat spektrofotometer Fourier Transform Infrared (FTIR) dengan mode transmisi. Hasil penelitian menunjukkan bahwa konsentrasi OG dalam sedimen berkisar antara <1 sampai 138,10 mg kg-1 berat kering (bk), sementara estimasi nilai TPH yang merupakan salah satu fraksi penyusun OG berkisar antara 0,24 - 36,60 mg kg-1 bk. Sedimen dengan konsentrasi OG tertinggi terdapat di St-10 yang terletak di bagian timur laut Delta Cimanuk. Dibandingkan dengan nilai batas panduan kualitas sedimen menurut ANZECC (TPH: 280-550 mg kg-1 bk), tingkat TPH di 18 stasiun pengamatan masih berada dalam kisaran batas normal, demikian pula dengan konsentrasi OG. Meskipun demikian, tingginya potensi asupan pencemaran yang terus menerus di muara DAS Cimanuk akan menurunkan kemampuan ekosistem estuari dalam menjaga keseimbangan kualitas lingkungan dan mengancam biodiversitas perairan. Kata kunci: cemaran, minyak dan lemak, TPH, sedimen, FTIR, Cimanuk. Abstract Determination of Total Petroleum Hidrokarbon (TPH) through the Concentration of Oil and Grease (OG) in the Surface Sediment of Cimanuk Delta Waters, West Java. The Estuary of Delta Cimanuk is located in the coastal water of Indramayu, West Java. The pollution in the Cimanuk Delta was originated from households and industrial waste on coastal dan upland areas. Coupled with the traffic activities of fishing vessels at the fish landing (PPI) and fishing port (PP) bases around the waters, oil and grease contamination would be a threat as pollution in Indramayu coastal area. The major source of OG component on coastal waters was animal and vegetal fat and total petroleum hydrocarbon (TPH). The objectives of the study are to estimate the concentration and spatial distribution of TPH in the sediments of the Cimanuk watershed based on OG levels, and identifying the distribution of TPH-contaminated areas. Fourier Transform Infrared Spectroscopy (FTIR) instrument was applied to determine OG compounds in the sediment samples.  The results showed that OG concentrations in sediments were varied between <1 to 138.104 mg kg-1 dry weight (dw), while TPH was estimated at 0.24 – 36.60 mg kg-1 dw. The highest concentrations of OG was observed on St10 in the northeast coast. Compared to the threshold value of sediments quality guidelines according to ANZECC (OG: 280-550 mg kg-1 dw), the TPH levels in eighteen observation stations were within normal range. The increased pollutant intake in Cimanuk watershed will threat the estuary as well as its biodiversity.  Keywords: pollution, oil and grease, total petroleum hydrocarbon, sediment, FTIR, Cimanuk.

Pengukuran Total Petroleum Hidrokarbon (TPH) Melalui Pendekatan Kadar Minyak-Lemak dalam Sedimen di Perairan Delta Cimanuk, Jawa Barat