Judul: Komposisi Mineral Mikro (Fe, Cu, Zn, I) dan Cemaran Logam Berat Pada Berbagai Ukuran Ikan Bandeng di Tambak Tanjung Pasir Kabupaten Tangerang
Abstrak: Milkfish (Chanos chanos), it has high economically value and more people consume it. The purpose of this study was to determine the yields of meat milkfish, micro minerals such as iron, zinc, copper, and iodine and heavy metals such as lead, cadmium, and mercury at veriety of weight. Micro minerals and heavy metals analysis both of them using atomic absorption spectrofotometric (AAS). The average analysis of meat were 46,37% of total weight. The highest micro mineral concentration obtained are ±150 g of total weight, iron 6,95±0,16 mg/kg, zinc 0,55±0,01 mg/kg and copper 12,14±0,06 mg/kg. The highest iodine concentration obtained is ±102 g of total weight, 76,33±0,01 μg/100g of dry weight. The concentrations which obtained are lead 0,143±0,0057 mg/kg, cadmium 0,0433±0,011 mg/kg, and mercury 0,143±0,0057 mg/kg of dryweight, respectively. The heavy metals degree from Tanjung Pasir Kabupaten Tangerang are safe consumption still below the limit for food savety, so can consume it.
Keyword: weight, micro mineral, heavy metal, Chanos chanos

Judul: Kandungan Logam Berat Hg, Cd, Pb, dan Cu pada Ikan Bandeng Chanos chanos (Forsskal, 1775) di Perairan Bojonegara, Teluk Banten
Abstrak: Perairan Bojonegara sebagai bagian dari Teluk Banten, merupakan perairan yang mendapat pengaruh dari aktivitas industri, perkapalan, dan domestik. Aktivitas tersebut dapat menimbulkan pencemaran berupa logam berat. Penelitian ini bertujuan untuk menentukan tingkat akumulasi logam berat (Hg, Cd, Pb, dan Cu) pada daging ikan bandeng serta menentukan batas aman dalam mengkonsumsi ikan bandeng (Chanos chanos) di perairan Bojonegara, Teluk Banten. Pengambilan contoh ikan dan pengamatan perairan dilaksanakan dari bulan Agustus hingga Oktober 2020. Pengukuran kandungan logam berat pada daging ikan dilakukan dengan menggunakan AAS (Atomic Absorption Spectrophotometer). Kandungan logam berat Hg, Cd, dan Pb masih berada dibawah limit deteksi alat AAS dan masih berada di bawah baku mutu. Kandungan logam Cu pada ikan bandeng ukuran besar berkisar antara 2,87- 16,87 mg/kg, sedangkan ukuran kecil berkisar antara 0,273-0,481 mg/kg. Kandungan logam Cu pada ikan bandeng ukuran kecil masih berada di bawah baku mutu, sedangkan ikan bandeng ukuran besar telah melebihi baku mutu yang telah ditetapkan. Akumulasi logam Hg, Cd, dan Pb pada ikan bandeng tergolong akumulasi rendah, sedangkan akumulasi logam Cu tergolong akumulasi rendah hingga tinggi. Kandungan logam berat Hg, Cd, Pb, dan Cu terhadap ukuran ikan besar dan kecil tidak berbeda nyata., Bojonegara waters as part of Banten Bay, are waters that are affected by industrial, shipping and domestic activities. These activities can cause pollution in the form of heavy metals. This study aims to determine the level of accumulation of heavy metal (Hg, Cd, Pb, and Cu) in milkfish meat and determine the safe limit for consuming milkfish (Chanos chanos) in Bojonegara waters. Measurement of heavy metals content in fish meat was carried out using AAS (Atomic Absorption Spectrophotometer). The content of heavy metals Hg, Cd, and Pb is still below the detection of the AAS tool and is still below the quality standard. The content of Cu metal in large milkfish ranges from 2,87-16,87 mg/kg, while the small size ranges from 0,273-0,481 mg/kg .The content of Cu metal in small milkfish is still below the quality standard, while large milkfish has exceeded the established quality standard. The accumulation of Hg, Cd, and Pb in milkfish is classified as low accumulation, while the accumulation of Cu metal is classified as low to high accumulation. The content of heavy metals Hg, Cd, Pb, and Cu on the size of the large and small fish is not significantly different.
Keyword: Banten Bay, Bojonegara waters, heavy metals

Judul: Penggunaan Metode Homotopi untuk Menyelesaikan Persamaan KdV (Korteweg-de Vries)
Abstrak: Natural phenomena can be explained using nonlinear mathematical models. In this paper, we studied the solution of KdV equation using the Homotopy method. The KdV equation is used for describing both surface and internal waves. One of the solutions is called a solitary wave. The use of homotopy method to solve the KdV equation required a nonlinear operator which was determined by the nonlinear form of the KdV equation itself. Based on this operator, a recursive formula was obtained to get a sequence of the KdV solution. The higher the sequence order of the sequence used, the closer to the exact solution of the KdV equation.
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