Judul: Heavy Metal Content (Pb, Cd, Cu) in Sediments in the Tinjil Island Waters, Pandeglang, Banten
Abstrak: Pulau Tinjil yang terletak di Kecamatan Cikeusik, Kabupaten Pandeglang, Provinsi Banten mengalami peristiwa penting pada tahun 2018, yakni kapal tongkang pengangkut batubara mengalami kecelakaan, sehingga batubara tumpah ke perairan. Tumpahan batubara ini akan terakumulasi di dasar perairan dan berpotensi mencemari Perairan Pulau Tinjil. Penelitian ini bertujuan untuk menduga tingkat pencemaran logam berat (Pb, Cd, Cu) pada sedimen di Perairan Pulau Tinjil, Pandeglang, Banten. Penelitian dilakukan pada bulan Juni 2020 dengan pengambilan sampel di Perairan Pulau Tinjil, Pandeglang, Banten. Data yang didapat berupa kandungan logam berat (Pb, Cd, Cu) pada sedimen yang dianalisis menggunakan alat ICP-OES. Hasil pengukuran logam Pb memiliki konsentrasi berkisar 0,005 mg/kg sampai 3,26 mg/kg. Hal tersebut menunjukkan bahwa logam Pb pada ketiga stasiun di bawah baku mutu. Logam Cd memiliki konsentrasi 4,12 mg/kg sampai 5,94 mg/kg. Hasil tersebut menunjukkan logam Cd memiliki konsentrasi melebihi baku mutu. Logam Cu memiliki nilai konsentrasi 2,37 mg/kg sampai 5,34 mg/kg. Hasil tersebut menunjukkan bahwa logam Cu pada ketiga stasiun di bawah baku mutu. Indeks geoakumulasi pada logam Pb dan Cu memiliki nilai negatif. Hal tersebut menunjukkan logam Pb dan Cu ada dalam kategori tidak tercemar. Indeks geoakumulasi logam Cd memiliki nilai 0,966 sampai 1,121 yang menunjukkan bahwa sedimen tercemar oleh logam Cd dalam rentang ringan dan sedang., Tinjil Island, located in Cikeusik District, Pandeglang Regency, Banten Province, experienced an important event in 2018, where a barge carrying coal had an accident, resulting in coal spilling into the waters. This coal spill will accumulate at the bottom of the waters and have the potential to pollute the waters of Tinjil Island. This research aims to estimate the level of heavy metal pollution (Pb, Cd, Cu) in sediments in the waters of Tinjil Island, Pandeglang, Banten. The research was conducted in June 2020 by taking samples in the waters of Tinjil Island, Pandeglang, Banten. The data obtained was in the form of heavy metal content (Pb, Cd, Cu) in the sediment which was analyzed using the ICP-OES tool. The results of measurements of Pb have concentrations ranging from 0.005 mg/kg to 3.26 mg/kg. This shows that the Pb at the three stations is below the quality standard. Cd has a concentration of 4.12 mg/kg to 5.94 mg/kg. These results show that Cd has a concentration that exceeds the quality standard. Cu has a concentration value of 2.37 mg/kg to 5.34 mg/kg. These results show that the Cu at the three stations is below the quality standard. The geoaccumulation index for Pb and Cu has negative values. This shows that Pb and Cu are in the uncontaminated category. The geoaccumulation index for Cd has a value of 0.966 to 1.121, which shows that the sediment is polluted by Cd in the light and moderate range.
Keyword: Logam Berat, Sedimen, Batubara, Pulau Tinjil

Judul: Heavy Metal Content of Pb and Cu in the Sandfish Holothuria scabra (Jaeger, 1833) in Tinjil Island Waters and Deli Island Waters, Banten
Abstrak: Potensi sumberdaya perikanan di Kabupaten Pandeglang terdiri dari ikan pelagis, ikan demersal, ikan karang, kerang-kerangan, cumi-cumi, udang dan teripang. Muatan batubara yang tumpah di bagian selatan perairan Pulau Tinjil dan Pulau Deli dapat menyebabkan terjadinya akumulasi logam berat pada sumberdaya perikanan. Penelitian ini bertujuan menganalisis akumulasi logam berat Pb dan Cu pada daging teripang pasir (Holothuria scabra) di perairan Pulau Tinjil dan Pulau Deli, Provinsi Banten. Pengambilan sampel dilaksanakan pada tanggal 6 sampai dengan 7 Juni 2020 di Pulau Tinjil dan 24 sampai dengan 25 Juni 2020 di Pulau Deli. Analisis logam berat Pb dan Cu menggunakan metode ICP OES. Kandungan logam Pb pada daging teripang pasir di perairan Pulau Tinjil berkisar 0,10 mg kg-1 hingga 0,16 mg kg-1 dan perairan Pulau Deli berkisar 0,01 mg kg-1 hingga 0,99 mg kg-1. Kandungan logam Cu pada daging teripang pasir di perairan Pulau Tinjil berkisar 1,22 mg kg-1 hingga 2,33 mg kg-1 dan di perairan Pulau Deli berkisar 2 mg kg-1 hingga 2,38 mg kg-1. Kandungan logam berat Pb dan Cu yang terdapat di dalam daging teripang pasir (Holothuria scabra) masih berada di bawah batas maksimum yang telah ditetapkan menurut baku mutu. Hal tersebut menunjukkan, bahwa teripang pasir di perairan Pulau Tinjil dan Pulau Deli dapat dikonsumsi dengan jumlah yang tidak berlebih. Kemudian, akumulasi Pb dan Cu pada teripang pasir di perairan Pulau Tinjil dan Pulau Deli termasuk ke dalam kategori rendah, karena hasil faktor biokonsentrasi teripang pada logam Pb dan Cu di kedua pulau kurang dari 100., Potential fishery resources in Pandeglang Regency consist of pelagic fish, demersal fish, reef fish, shellfish, squid, shrimp and sea cucumbers. Spilled coal loads in the southern part of the waters can cause accumulation of heavy metals in sandfish. This study aims to analyze the accumulation of heavy metals Pb and Cu in the meet of sandfish (Holothuria scabra) in the waters of Tinjil Island and Deli Island, Banten Province. Sampling was carried out on 6 to 7 June 2020 on Tinjil Island and 24 to 25 June 2020 on Deli Island. Analysis of heavy metals Pb and Cu using the ICP OES method. The content of Pb metal in sandfish meat in Tinjil Island waters ranged from 0.10 mg kg-1 to 0.16 mg kg-1 and in Deli Island waters it ranged from 0.01 mg kg-1 to 0.99 mg kg-1. Cu content in sandfish meat in Tinjil Island waters ranged from 1.22 mg kg-1 to 2.33 mg kg-1 and in Deli Island waters it ranged from 2 mg kg-1 to 2.38 mg kg-1. The content of heavy metals Pb and Cu in the meat of sandfish (Holothuria scabra) is still below the maximum limit set according to quality standard. This shows that sandfish in the waters of Tinjil Island and Deli Island can be consumed in moderation. Then, the accumulation of Pb and Cu in sandfish in the waters of Tinjil Island and Deli Island is included in the low category, because the results of the bioconcentration factor of sandfish on Pb and Cu metals on both islands are less than 100.
Keyword: Heavy metal, Deli Island, Tinjil Island, Sandfish

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.
Keyword: