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ABSTRAK Mobilitas (termasuk proses desorpsi-absorpsi) logam berat dalam sedimen bervariasi yang bergantung pada asosiasinya pada komponen mineral dan non-mineral sedimen yang dapat juga mengindikasikan pada sumber alami dan non-alami. Penelitian ini bertujuan mengungkap kemungkinan sumber logam berat Cu dan Fe berdasarkan fraksinasi dan total logam. Lokasi penelitian terdiri dari 11 titik yang terbagi menjadi tiga bagian pesisir timur, pesisir barat, dan Pulau Nias, Sumatera Utara. Fraksi geokimia diperoleh berdasarkan prosedur ektraksi bertingkat SEP BCR (Sequential Extraction Process Bureau Commune de Reference of the European Commission) dalam empat fase yaitu: Fraksi terlarutkan asam, fraksi tereduksi, fraksi oksidasi, dan fraksi residual. Total logam diperoleh berdasarkan metode USEPA 3050B. Pengukuran logam dilakukan dengan menggunakan spektrofotometri serapan atom (SSA). Hasil penelitian menunjukkan bahwa kegiatan antropogenik diduga menyumbang logam Fe dalam sedimen yang ditunjukkan oleh konsentrasi non residu (5,55-203,15 mg/kg) yang lebih tinggi dibandingkan fraksi residu (4,89-21,47 mg/kg). Berbanding terbalik dengan logam Cu yang asosiasi tertinggi adalah fraksi residu (2,24-8,85 mg/kg). Logam berat dalam sedimen mendapat kontribusi dari sumber alami dan antropogenik, logam Cu diduga bersumber lebih banyak secara alami dan logam Fe diduga bersumber lebih dominan dari aktifitas manusia (antropogenik) baik sekitar wilayah pesisir maupun kemungkinan berasal dari daratan. ABSTRACT Mobility (including desorption-absorption) of heavy metals in sediments varies depending on the chemical properties of sedimentary minerals in which the metals are associated and hence possibly differentiate their origin (natural and anthropogenic). This study aims to reveal on Cu and Fe of origin based on their chemical fractionation and total concentration. The study location consisted of 11 points clustered into three parts i.e the east coast, west coast, and Nias Island of North Sumatra. The geochemical fraction was obtained based on the SEP BCR (Sequential Extraction Process Bureau Reference of the European Commission) multilevel procedure in four phases: acid dissolved fraction, reduced fraction, oxidation fraction, and residual fraction. The total metal determination was based on the USEPA 3050B method. Metal concentration determination were carried out using atomic absorption spectrophotometry (AAS). The results showed that anthropogenic activities suspected of contributing Fe metal to sediment were higher indicated by non-residual concentrations (5.55-203.15 mg/kg) than the residual fraction (4.89-21.47 mg/kg). In contrast to Cu, the highest association in the sediment is the residual fraction (2.24-8.85 mg/kg). These metal apparently were derived from both natural and anthropogenic sources . Heavy metals in sediments have contributed from natural and anthropogenic sources, Cu is thought to have more natural sources and Fe is thought to originate predominantly from human activities both around the coast and possibly from the land.

PARTISI KIMIAWI Cu DAN Fe PADA SEDIMEN PERMUKAAN DI PESISIR TIMUR DAN BARAT SUMATRA UTARA