Tujuan Penelitian Ini Adalah Memberikan Informasi Mengenai Keberadaan, Jenis, Jumlah Dan Konsentrasi Logam Berat Kadmium (Cd) Dan Nikel (Ni) Di Air Dan Sedimen Serta Akumulasinya Pada Rumput Laut Eucheuma Cottonii Di Perairan Amal Kota Tarakan. Diperairan Telah Ditemukan 2 Jenis Logam Berat Yaitu Kadmium (Cd) Dan Nikel (Ni) Di Air Sedimen. Pada Rumput Laut Eucheuma Cottonii Tidak Ditemukan 2 Jenis Logam Berat Pada Saat Semai Dan Pada Saat Panen Ditemukan Logam Berat Nikel (Ni). Konsentrasi Logam Berat Di Air Yaitu Kadmium 0.005 - 0.007 Kadmium 0.068 Mg/L Dan Nikel 0.175 Mg/L. Konsetrasi Logam Berat Di Rumput Laut Eucheuma Cottonii Saat Panen Yaitu Nikel 16.6 Mg/L.
Kata Kunci: Logam Berat, Air, Sedimen, Eucheuma Cottonii

The Purpose Of This Study Is To Provide Information About The Existence, Type, Amount And Concentration Of Heavy Metals Cadmium (Cd) And Nickel (Ni) In Water And Sediments And Its Accumulation In Seaweed Eucheuma Cottonii At Amal Waters Tarakan City. In The Water Has Found Two Types Of Heavy Metal, Cadmium (Cd) And Nickel (Ni) In Water And Sediments. In Eucheuma Cottoni Seaweed Has Not Found 2 Types Of Heavy Metals In Seedling Time, And In Harvest Timen Was Found 1 Types Of Heavy Metal Is Nickel (Ni). Concentrations Of Heavy Metals In The Waters Of Cadmium From 0.005 To 0.007 Mg/L And Nickel 0.064 To 0.084 Mg/L. Concentrations Of Heavy Metals In The Sediment Are Cadmium 0.068 Mg/L And Nickel 0.175 Mg/L. Concentrations Of Heavy Metals In Seaweed Euchema Cottonii As Nikel Are 16.6 Mg/L. Keywords: Heavy Metals, Waters, Sediments, Eucheuma Cottonii