Judul: Heavy Metals Residue of Pb and Fe in Water and  Sediment in River of Cinangka Village, Bogor
Abstrak: DANDY RISWANDI. Kandungan Logam Berat Pb dan Fe pada Air dan Sedimen di Sungai Desa Cinangka, Bogor. Dibimbing oleh SIGID HARIYADI dan ETTY RIANI. Limbah daur ulang aki bekas mengandung logam berat yang bisa mengganggu kesehatan manusia dan biota. Penelitian kandungan logam berat pada air dan sedimen di Sungai Desa Cinangka, Bogor belum pernah dilakukan. Penelitian ini bertujuan menganalisis kandungan logam berat Pb dan Fe pada air dan sedimen di Sungai Desa Cinangka, Kabupaten Bogor berdasarkan perbandingan dengan peraturan yang sudah ditetapkan. Penelitian dilaksanakan pada September 2023 hingga Juni 2024 Analisis logam berat pada air menggunakan metode AAS (Atomic Absorption Spectrofotometry). Analisis logam berat pada sedimen menggunakan XRF (X-Ray Fluoresence). Kandungan logam berat Pb dan Fe pada air dan sedimen di Sungai Desa Cinangka melebihi baku mutu yang sudah ditetapkan, DANDY RISWANDI. Heavy Metals Residue of Pb and Fe in Water and Sediment in River of Cinangka Village, Bogor. Supervised by SIGID HARIYADI and ETTY RIANI. Used battery recycling waste contains heavy metals which can harm human health and biota. Research on heavy metal residue in water and sediment in Cinangka Village, Bogor Regency has never been carried out. This research aims to analyze the residue of heavy metals Pb and Fe in water and sediment in the Cinangka Village River, Bogor Regency based on comparison with established regulations. The research was carried out from September 2023 to June 2024. Analysis of heavy metals in water using the AAS (Atomic Absorption Spectrofotometry) method. Analysis of heavy metals in sediment using XRF (X- Ray Fluoresence). The residue of heavy metals Pb and Fe in the water and sediment in the Cinangka Village River exceeds the established quality standards
Keyword: air, sedimen, sungai, besi, timbal

Judul: Heavy Metal Content of Fe, Pb in Water and Tilapia (Oreochromis niloticus) in Cinangka Village, Bogor District
Abstrak: Perairan yang tercemar oleh logam berat akibat aktivitas antropogenik sangat memungkinkan terakumulasi ke dalam tubuh biota seperti ikan nila (Oreochromis niloticus) yang terdapat di wilayah perairan sekitar Desa Cinangka. Penelitian ini bertujuan menganalisis bioakumulasi kandungan logam berat timbal (Pb) dan besi (Fe) pada ikan nila serta hubungannya dengan kualitas air. Pengambilan sampel dilakukan sebanyak tiga kali pada bulan September 2020. Titik sampling yang dipilih adalah kolam pemancingan ikan yang terdapat di Desa Cinangka. Analisis konsentrasi logam berat dilakukan dengan menggunakan metode Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES). Parameter kualitas air kolam pemancingan Desa Cinangka masih sesuai dengan baku mutu. Hasil pengukuran kandungan logam Pb pada daging ikan nila berkisar antara 0,32 mg kg-1 hingga 0,4 mg kg-1 dan kandungan logam Fe sebesar 2,18 mg kg-1 hingga 3 mg kg-1. Faktor biokonsentrasi logam Pb termasuk kategori tinggi dan logam Fe termasuk kategori rendah hingga sedang. Waktu pengambilan sampel yang dilakukan tidak berpengaruh secara signifikan terhadap akumulasi logam berat pada ikan nila. Kata kunci: Bioakumulasi, Desa Cinangka, logam berat, Oreochromis niloticus, Waters polluted by heavy metals due to community activities are very likely to accumulate in the body of organism such as tilapia (Oreochromis niloticus) found in the waters around Cinangka Village. This study aims to analyze the bioaccumulation of lead (Pb) and iron (Fe) in tilapia and their relationship with water quality. Sampling was carried out three times in September 2020. The selected sampling point is a fishing pond in Cinangka Village. Heavy metal concentration analysis was carried out using the Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) method. Parameters of water quality of Cinangka Village fishing pond still in accordance with quality standards. The results of measurements of Pb metal content in tilapia ranged from 0.32 mg kg-1 to 0.4 mg kg-1 and Fe metal content was 2.18 mg kg-1 to 3 mg kg-1. Bioconcentration factor of Pb is high category and Fe metal is low to medium category. The sampling time was not significantly affected by the accumulation of heavy metals in tilapia. Keywords: Bioaccumulation, Cinangka Village, heavy metals, Oreochromis niloticus
Keyword: Bioaccumulation, Cinangka Village, heavy metals, Oreochromis niloticus

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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