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"Pengamatan terhadap kandungan logam berat dalam sedimen telah dilakukan di perairan Teluk Jakarta pada bulan Juni dan September 2003. Kadar logam berat dalam sedimen di bagian Barat Teluk Jakarta berkisar antara Pb = 8,49-31,22 ppm, Cd = <0,001-0,47 ppm, Cu = 13,81-193,75 ppm, Zn = 82,18-533,59 ppm dan Ni = 0,99-35,38 ppm, sedangkan bagian Tengah Teluk Jakarta, kadar Pb berkisar antara 2,21-69,22 ppm, Cd = <0,001-0,28 ppm, Cu = 3,36-50,65 ppm, Zn = 71,13-230,54 ppm dan Ni = 0,42-15,58 ppm dan bagian Timur Teluk Jakarta, kadar Pb berkisar antara 0,25-77,42 ppm, Cd = <0,001-0,42 ppm, Cu = 0,79-44,94 ppm, Zn = 93,21-289,00 ppm dan Ni = 0,42-128,47 ppm. Kadar logam berat dalam sedimen di bagian Barat Teluk Jakarta lebih tinggi dibandingkan di bagian Tengah dan Timur Teluk Jakarta. Sedimen di bagian Barat Teluk Jakarta mempunyai tekstur berupa lumpur yang berwarna hitam, hal ini terbukti bahwa sedimen yang mempunyai tekstur berupa lumpur mengandung logam berat yang cukup tinggi.

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Observation on Heavy Metals in Sediment of Jakarta Bay Waters. Observation on heavy metals in Jakarta Bay, from June and September 2003. Heavy metals Pb in sediment at the West have been conductet of Jakarta Bay Waters varied between Pb = 8,49-31,22 ppm, Cd = <0,001-0,47 ppm, Cu = 13,81-193,75 ppm, Zn = 82,18-533,59 ppm and Ni = 0,99-35,38 ppm,while those at the Center of Jakarta Bay, varied between Pb = 2,21-69,22 ppm, Cd = <0,001-0,28 ppm, Cu = 3,36-50,65 ppm, Zn = 71,13-230,54 ppm and Ni = 0,42-15,58 ppm and at the East of Jakarta Bay, Pb content varied between 0,25-77,42 ppm, Cd = <0,001-0,42 ppm, Cu = 0,79-44,94 ppm, Zn = 93,21-289,00 ppm and Ni = 0,42-128,47 ppm. Hevy metals content in sediment the West of Jakarta Bay was high of equivalent the Center and East of Jakarta Bay. At than those composition sediment at the west was black, that indicated high heavy metals content."

"Pencemaran logam berat ini paling banyak berasal dari limbah air. Oleh karena itu, salah satu cara meminimalisir pencemaran logam berat yaitu adsorpsi dengan menggunakan adsorbent. Terak feronikel memiliki potensi untuk dijadikan adsorbent logam berat. Tujuan dari penelitian ini adalah untuk mengetahui efisiensi residu dari terak feronikel untuk menjadi adsorbent logam berat. Proses hidrotermal dan pelindian dilakukan dengan variasi temperature 140, 160, 180, 200 dan 220^oC serta variasi waktu 30 menit, 1 jam, 2 jam, 4 jam dan 7 jam serta proses kalsinasi dilakukan dengan variasi temperatur 600, 650, 700 dan 750^oC dengan waktu ½, 1, 2, 4 dan 7 jam. Hasil dari karakterisasi ICP-OES yaitu temperature optimal diketahui pada temperature 220^oC dan untuk variasi waktu pada waktu 2 jam dikarenakan memiliki efisiensi adsorpsi paling tinggi untuk mengikat logam berat. Hasil dari karakterisasi ICP-OES dan SEM bahwa temperature optimal untuk tingkat efisiensi adsorpsi paling tinggi yaitu pada temperature 700^oC dikarenakan nilai hasil efisiensi adsorpsi yang paling tinggi dan hasil SEM yang memiliki luas permukaan paling luas serta berpori-pori kecil dan banyak.

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Most of this heavy metal pollution comes from waste water. Therefore, one way to eliminate heavy metal pollution is adsorption using an adsorbent. Ferronickel slag has the potential to be used as heavy metal adsorbent. The purpose of this study was to determine the residual efficiency of ferronickel slag to become heavy metal adsorbent. The hydrothermal and leaching processes were carried out with temperature variations of 140, 160, 180, 200 and 220^oC as well as time variations of  30 minutes, 1 hour, 2 hours, 4 hours and 7 hours and the calcination process was carried out with temperature variations of 600, 650, 700 and 750^oC with time ½, 1, 2, 4 and 7 hours. The result of ICP-OES characterization is that the optimal temperature is known at 220^oC and for time variations at 2 hours because it has the highest adsorption efficiency to bind heavy metals. The results of the characterization of ICP-OES and SEM that the optimal temperature for the highest level of adsorption efficiency is at a temperature of 700^oC because the value of the highest adsorption efficiency and SEM results has the largest surface area and has many small pores."

"Saguling reservoir has recently been facing to several serious problems such as water qualitydegradation due to organic matter contamination, heavy metal, pesticides and other micropollutant materials.... "