Judul: Tingkat Pencemaran di Perairan Pantai Bojonegara, Teluk Banten Berdasarkan Parameter Fisika-Kimia Perairan
Abstrak: Kondisi kualitas air yang baik di suatu perairan sangat penting untuk mendukung keberlangsungan hidup organisme yang hidup di dalamnya. Penentuan status mutu suatu perairan penting dilakukan dalam menduga kondisi pencemaran suatu perairan. Penelitian ini bertujuan mengkaji status mutu air dan indeks pencemaran perairan pantai Bojonegara, Teluk Banten. Pengambilan sampel dilakukan pada bulan Januari-Februari dan bulan Agustus-Oktober 2020 dari enam stasiun penelitian. Parameter yang dianalisis antara lain suhu, salinitas, kecerahan, kekeruhan, TSS, pH, DO, nitrat, dan fosfat total. Hasil analisis yang diperoleh dibandingkan baku mutu berdasarkan PP No 22 Tahun 2021. Berdasarkan hasil pengamatan suhu (28.4-37.5oC), salinitas (0-38 ppt), kecerahan (0.05-4.7 m), kekeruhan (1.1-380 mg/l), TSS (0.7-415 mg/l), pH (6.63-8.2), DO (3.3-7.5 mg/l), nitrat (0.001-0.745 mg/l), dan fosfat total (0.001-0.377 mg/l), menunjukan bahwa sebagian parameter masih tergolong dibawah baku mutu, beberapa parameter kurang sesuai dengan baku mutu perairan (antara lain TSS, kekeruhan, nitrat, dan fosfat total). Berdasarkan hasil perhitungan indeks pencemaran perairan pantai Bojonegara memiliki indeks pencemaran kategori tercemar ringan hingga sedang (2.988-7.561)., Good water quality conditions in marine environment are important to support the survival of living organism, and hence, needed to estimate the status of water pollution. Determination of water quality status is needed to do in estimating the condition of water pollution. This study aims to examine the status of the water quality and water pollution index of Bojonegara coastal waters, Banten Bay. Sampling was carried out in January February and August-October 2020 at six stations. Parameters analyzed included temperature, salinity, transparency, turbidity, TSS, pH, DO, nitrate, and total phosphate. The results were compared with the water quality standards based on Gov. Reg. No 22 of 2021. Based on the observations of temperature (28.4-37.5oC), salinity (0-38 ppt), transparency (0.05-4.7 m), turbidity (1.1 -380 mg/l), TSS ( 0.7-415 mg/l), pH (6.63-8.2), DO (3.3-7.5 mg/l), nitrate (0.001-0.745 mg/l), and total phosphate (0.001 - 0.377 mg/l), indicating that some parameters were still below the quality standard and some parameters were not in accordance with the water quality standard (including TSS, turbidity, nitrate, and total phosphate). Based on the results of the calculation of the pollution index, Bojonegara coastal waters were classified into the light to moderately polluted category (2.988-7.561).
Keyword: Baku mutu, Bojonegara, indeks pencemaran, kualitas air

Judul: Analysis of Water Pollution Level in Domas Coastal Waters Based on Some Physical and Chemical Parameters
Abstrak: Wilayah pesisir di Teluk Banten diketahui mengalami pertumbuhan penduduk dan industri yang cukup tinggi, yang dapat berpengaruh bagi lingkungan perairan. Pantai Domas merupakan salah satu wilayah perairan yang terletak di bagian pesisir timur Teluk Banten. Penelitian ini bertujuan menentukan tingkat pencemaran perairan Pantai Domas, Teluk Banten berdasarkan beberapa parameter fisika dan kimia perairan. Penelitian ini dilaksanakan selama enam bulan, sejak bulan Agustus 2021 hingga bulan Januari 2022 pada enam stasiun pengamatan. Parameter kualitas air yang diamati pada penelitian ini adalah suhu, TSS, kekeruhan, kecerahan, kedalaman, pH, DO, salinitas, amonia, nitrit, nitrat, dan fosfat total. Nilai parameter kualitas air yang diperoleh dibandingkan dengan baku mutu air laut menurut PP No. 22 Tahun 2021. Status mutu air ditentukan dengan menggunakan Indeks Pencemaran dan Metode STORET yang mengacu pada Kepmen LH No. 115 Tahun 2003. Hasil analisis menunjukkan bahwa perairan Pantai Domas terindikasi tercemar sedang, baik berdasarkan Indeks Pencemaran (5,7-5,9) maupun Metode STORET (-14 hingga -24)., The coastal area of Banten Bay has a high population and industrial growth which can affect the aquatic environment. Domas Coastal Waters are one of the water areas located on the east coast of Banten Bay. This study aims to determine the water pollution level in Domas Coastal Waters, Banten Bay, based on some physical and chemical parameters. Sampling was carried out for six months, from August 2021 to January 2022 at six stations. The water quality parameters observed in this study were temperature, TSS, turbidity, transparency, depth, pH, DO, salinity, ammonia, nitrite, nitrate, and total phosphate. The water quality data was compared with water quality standards based on Indonesian Government Regulation No. 22 of 2021. Water quality status was determined using the Pollution Index (PI) and the STORET Method according to Decree of the Minister of the Environment No. 115 of 2003. The results show that Domas Coastal Waters are indicated to be moderately polluted, both based on the Pollution Index (5,7-5,9) and the STORET Method (-14 to -24).
Keyword: Domas, environment, water quality parameters

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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