Judul: Heavy Metal (Hg, Cd, Pb, and Cu) in the Blue Swimming Crab (Portunus pelagicus) at Bojonegara Coastal Waters, Banten Bay
Abstrak: Perairan pantai Bojonegara, Teluk Banten merupakan zona industri di wilayah Serang Barat yang dicirikan dengan banyaknya pabrik di sekitar pantai yang berpotensi menghasilkan bahan pencemar seperti logam berat dll. Bahan ini masuk ke dalam perairan dan berakumulasi dalam tubuh organisme perairan termasuk rajungan. Penelitian ini bertujuan menganalisis tingkat akumulasi kandungan logam berat pada rajungan (Portunus pelagicus) di Teluk Banten. Pengambilan sampel dilaksanakan pada bulan Agustus hingga Oktober 2020. Analisis kandungan logam berat dilakukan dengan menggunakan alat AAS (Atomic Absorption Spectrophotometer). Hasil pengamatan menunjukkan kandungan logam berat Hg, Cd, Pb, dan Cu berbeda nyata antara rajungan besar dan kecil (p<0,05). Kandungan akumulasi logam berat Cu pada rajungan kecil berkisar 3,22-4,34 mg kg-1 dan rajungan besar berkisar 6,64-9,52 mg kg-1 sedangkan kandungan logam berat Hg, Cd, dan Pb pada rajungan berada di bawah deteksi alat AAS. Bioakumulasi logam Cu pada rajungan tersebut termasuk akumulasi sedang hingga tinggi sedangkan logam logam Hg, Cd dan Pb tergolong akumulasi yang rendah. Batas aman konsumsi rajungan yaitu 22,0588 kg daging/minggu untuk orang dewasa dan 5,5147 kg daging/minggu untuk anak-anak., Bojonegara coast, Banten Bay is an industrial zone in the West Serang region, which is characterized by the presence of some factories around the coast. These have potential to produce and pour the pollutants such as heavy metals into the water and accumulate into the body of aquatic organisms like blue swimming crab. This study aims to analyze the level of heavy metal accumulation in the blue swimming crab (Portunus pelagicus) of Banten Bay waters. Sampling was carried out from August to October 2020. Analysis of heavy metal content was carried out using AAS (Atomic Absorption Spectrophotometer). During the observation, the heavy metal content of Hg, Cd, Pb, and Cu were significantly different between large and small blue swimming crab (p<0,05). The accumulation of heavy metal Cu in small blue swimming crab ranged from 3,22-4,34 mg kg-1 and large blue swimming crab ranged from 6,64-9,52 mg kg-1 while the heavy metal content of Hg, Cd, and Pb in small crabs was below detection AAS. Bioaccumulation of Cu in blue swimming included moderate to high, while heavy metal Hg, Cd, and Pb it was low accumulation. The safe limit for consumption blue swimming crab is 22,0588 kg of meat/week for adults and 5,5147 kg of meat/week for children.
Keyword: Accumulation, blue swimming crab, Bojonegara coastal waters, heavy metals

Judul: Analisis Kandungan Logam Berat Hg, Cd, Pb, dan Cu pada Kerang Hijau Perna viridis (Linnaeus, 1758) di Perairan Teluk Banten
Abstrak: Teluk Banten mendapatkan masukan limbah yang menyebabkan konsentrasi logam berat di perairan meningkat dan menyebabkan akumulasi pada biota air terutama kerang-kerangan. Kerang hijau bersifat filter feeder yaitu memakan dengan cara menyaring partikel yang berada di perairan sehingga mudah mengakumulasi logam berat dalam tubuhnya. Penelitian bertujuan untuk menentukan tingkat akumulasi logam berat Hg, Cd, Pb, dan Cu pada kerang hijau (Perna viridis) dengan ukuran berbeda di Teluk Banten. Penelitian dilakukan pada bulan Agustus-Oktober 2020 di Teluk Banten. Analisis kandungan logam berat menggunakan metode Atomic Absorption Spectropotometer (AAS). Secara umum kualitas air perairan Bojonegara, Teluk Banten di bawah nilai baku mutu. Kandungan logam berat Hg, Cd, Pb, dan Cu berada di bawah baku mutu. Kerang hijau ukuran kecil dan besar mengalami bioakumulasi logam berat Cu termasuk ke dalam akumulasi tinggi, namun pada bulan Agustus kerang hijau ukuran kecil mengalami bioakumulasi sedang. Bioakumulasi logam berat Pb, Hg, Cd termasuk ke dalam akumulasi rendah. Waktu pengambilan sampel tidak berpengaruh secara signifkan terhadap kandungan logam berat Cu pada daging kerang hijau ukuran kecil dan besar., Banten Bay are continuously receiving waste input so that it is suspected that heavy metal concentrations in the waters have increased and caused accumulation in aquatic biota especially shellfish. Green mussels are filter feeder, they eat by filtering particles in the water so that they can easily accumulate heavy metals in their bodies. This study aims to determine the level of accumulation of heavy metals Hg, Cd, Pb, and Cu in green mussels (Perna viridis) of different sizes in Banten Bay. The study was conducted from August to October 2020 in Banten Bay. Analysis of heavy metals content using the Atomic Absorption Spectrophotometer (AAS) method. In general, the water quality in Bojonegara, Banten Bay is below the standard quality value. Heavy metals Hg, Cd, Pb, and Cu which are below the quality standards. Small and large green mussels size have high bioaccumulation of copper, but small green mussels in August have moderate biaccumulation. Bioaccumulation of heavy metals Hg, Cd, Pb is included in the low accumulation. Sampling time did not significantly affect the Cu heavy metal content in small and large green mussel meat.
Keyword: accumulation, Banten Bay, heavy metal, Perna viridis

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
Keyword: