Judul: Kandungan Logam Berat Pb, Cu, Cd, dan Hg pada Kerang Darah Anadara granosa (Linnaeus, 1758) di Perairan Pesisir Kabupaten Tangerang
Abstrak: Blood cockle (Anadara granosa) is one of the biological resources that have been used by Indonesian people. They can accumulate more metals than the other aquatic animals because they settle and filter their feed. The purpose of this study is to reveal the metal content of Pb, Cu, Cd, and Hg were found in the blood cockle. AAS (Atomic Absorbtion spectrophotometry) were used to analyze the heavy metal concentration. The result showed that the highest metal content of Pb is 0,675 mg/kg on June and 1,860 mg/kg on August in Kronjo and Cu is 3,440 mg/kg in Cituis. The Bioconcentration Factor (BCF) showed that blood cockle in Kronjo and Cituis has a moderately accumulation in Pb and Cd, but lower in Cu.
Keyword: PTWI, Kronjo, heavy metals, Cituis, Blood cockle (Anadara granosa)

Judul: Kandungan Logam Berat Pb, Hg, Cd, dan Cu pada Kerang Darah (Tegillarca granosa) di Perairan Pantai Bojonegara, Teluk Banten
Abstrak: Teluk Banten merupakan wilayah perairan yang memiliki beberapa muara sungai. Aliran sungai tersebut diperkirakan membawa limbah dari kegiatan domestik maupun industri, salah satu jenis limbah tersebut adalah logam berat. Penelitian ini bertujuan mengestimasi akumulasi kandungan logam berat yang terdapat pada daging kerang darah (Tegillarca granosa) di perairan Pantai Bojonegara, Teluk Banten. Sampel kerang darah diambil pada bulan Agustus-Oktober 2020, dan Maret 2021 di perairan Pantai Bojonegara, Teluk Banten. Kandungan logam berat diukur dengan alat AAS (Atomic Absorption Spectrophotometer). Kandungan logam berat Pb, Hg, Cd, dan Cu dalam daging kerang darah secara berurutan bernilai kurang dari 0,03 mg kg-1, kurang dari 0,001 mg kg-1, kurang dari 0,005 mg kg-1, serta kisaran 0,634-5,48 mg kg-1. Kandungan logam berat Pb, Hg, dan Cd pada kerang darah tidak melampaui batas maksimal yang diperbolehkan BPOM (2018) dan FAO/WHO (2011). Namun, kandungan logam berat Cu sudah melebihi batas mutu yang ditetapkan FAO/WHO (2011). Faktor biokonsentrasi kerang darah pada ukuran kecil dan ukuran besar memiliki sebaran nilai mulai dari rendah, sedang, hingga tinggi. Kandungan logam berat berkaitan erat dengan ukuran tubuh kerang darah., Banten Bay is the water that has several estuaries. The flow of these rivers can carry waste from domestic and industrial activities such as heavy metals. This study estimates the accumulation of heavy metals in the flesh of blood cockle (Tegillarca granosa) in Bojonegara Coastal Waters, Banten Bay. Blood cockle samples were collected in August-October 2020 and March 2021 in Bojonegara coastal waters, Banten Bay. Heavy metal content was measured using AAS (Atomic Absorption Spectrophotometer). The heavy metal content Pb, Hg, Cd, and Cu in blood cockle meat, respectively, were less than 0.03 mg kg-1, less than 0.001 mg kg-1, less than 0.005 mg kg-1, and range 0.634-5.48 mg kg-1. The heavy metal content of Pb, Hg, and Cd in the blood cockle did not exceed the maximum allowable limit by BPOM (2018) and FAO/WHO (2011). However, the Cu concentration was above the specified quality standard by FAO/WHO (2011). The bioconcentration factor values of blood cockle in small and large sizes range from low, medium, to high. The concentration of heavy metals in blood cockle meat is related to its body size.
Keyword: Blood cockle, Heavy metals, Banten Bay

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
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