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All Journal Jurnal Pendidikan dan Pemberdayaan Masyarakat Alotrop Jurnal Pendidikan dan Ilmu Kimia PENDIPA Journal of Science Education Jurnal Teknodik Hydrogen: Jurnal Kependidikan Kimia TRIBUTE: JOURNAL OF COMMUNITY SERVICES
Rina Elvia
FKIP Universitas Bengkulu
Humanities Chemistry Computer Science & IT Education Languange, Linguistic, Communication & Media Mathematics Social Sciences

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PENERAPAN KEMOMETRIK PADA METODE CITRA DIGITAL UNTUK ANALISIS ION MERKURI (II) DENGAN INDIKATOR NANOPARTIKEL PERAK Angga Aprian Dinata; M. Lutfi Firdaus; Rina Elvia
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9049

Abstract

Digital image method in quantitative analysis usually uses one of the RGB primary color components (Red, Green, Blue), so that not all digital image data can be extracted. Then needed a method that can render the whole RGB values as variables in quantitative analysis are known as chemometric. This research aims to know the influence of the application of chemometric against the sensitivity of the digital image. Chemometry method used is the Principal Component Regression (PCR) and Partial Least Square (PLS) using Unscramber X software from Camo software, USA.. This method is applied for the quantitative analysis of Mercury (II) ion with silver nanoparticles (NPP) immobilization on filter paper indicator. The research results showed that chemometric has a good influence against the level of the Limit of Detection (LOD) of the digital image, where the level of LOD with chemometric application of the Principal Component Regression (PCR) is 0.4311 ppb, and Partial Least Square (PLS) is  0.4310 ppb smaller than without the application of chemometric Single Linear Regression (SLR) at 0.837 ppb. 
PENGEMBANGAN ALAT EVALUASI PEMBELAJARAN KIMIA BERBASIS KOMPUTER MENGGUNAKAN WONDERSHARE QUIZ CREATOR PADA MATERI LARUTAN PENYANGGA Areski Febriani; Rina Elvia; Dewi Handayani
ALOTROP Vol 5, No 2 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i2.17141

Abstract

PERBANDINGAN HASIL BELAJAR KIMIA SISWA MENGGUNAKAN MODEL PEMBELAJARAN WORD SQUARE DAN MODEL PEMBELAJARAN SCRAMBLE DI MAN 2 KOTA BENGKULU Weny Shintia; Amrul Bahar; Rina Elvia
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9034

Abstract

This study aimed to compare the chemistry learning outcomes of students with using word square model learning and scramble model learning in grade X MAN 2 Kota Bengkulu on the subject of chemistry compound nomenclature. This was quasy experimental research and held in March to May 2018. Population in this study is the entire class X MIA in MAN 2 Kota Bengkulu  2017/2018  academic   year,  amounting  to  149  students.  Sample  is  class  X  MIA  1  and  class  X  MIA  3.        The sample of the research is class X MIA 1 with 32 students and class X MIA 3 with 33 students. Data analysis used normality test, homogeneity test and hypothesis test (t test). Data analysis was performed using Statistical Package for The Social Science (SPSS) version 16.Improvement student’s learning outcomes in this research was taken from difference assess of pretest and posttest. At experiment class of I average value improvement  of student’s learning outcomes was 50.32. while at experiment  class of II, average value improvement of student’s learning outcomes was 44.4 . through some statistic test, there was t-test (? = 0.05) which done test the hypothesis to obtained the test result was t value = 2.174 and t tabel = 1.998. The result of data analysis showed that were significant differences in student learning outcomes between the class which implemented word square model learning and the class which implemented scramble model learning. Student learning outcomes that apply the word square model of learning better than student learning outcomes that apply the scramble model of learning.
ANALISIS KADAR MERKURI PADA BIOTA AIR DENGAN NANOPARTIKEL PERAK SECARA CITRA DIGITAL DI LOKASI PENAMBANGAN EMAS KABUPATEN LEBONG Hendry Nordan; Mochamad Lutfi Firdaus; Rina Elvia
ALOTROP Vol 4, No 1 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i1.13695

Abstract

This study aimed at determining of how the sensitivity of silver nanoparticles (NPP) in detecting metal mercury in aquatic biota samples through digital imagery. The Sampling of aquatic biota was carried out in the gold mining location of Lebong Tambang village in Lebong district (102 ° 12'00 "-102 ° 18'05" BT and 3 ° 10'00 "-3 ° 17 ' 00 "LS.) The aquatic biota samples analyzed included fish, shellfish, shrimp and plants as well as comparison samples such as water and sediment. The Analysis of mercury level was carried out from December 2018 - March 2019 by using NPP of digital imagery method. The digital imagery method was used as a detector to replace the conventional spectrophotometer. The result of mercury level in aquatic biota with NPP in digital imagery was susceptible compared to the UV-Vis spectrophotometry method. It can be seen from the Limit Of Detection (LOD) score of the digital imagery method with the SLR data analysis technique by using a digital camera that is equal to 2.305 ppb, where the score was smaller than the LOD value in spectrophotometry which is 300 ppb. The results of the analysis of mercury level by using digital imagery method were obtained the concentration on pool shells of 196.8 ppb, in pond fish samples of 155.7 ppb, in shrimp samples of 81.2 ppb, in river fish samples of 81.1 ppb, and in plant samples of 50.9 ppb. thus, these results indicate that the presence of mercury ions in the samples of aquatic biota tested has levels above the threshold, which means samples of fish, shrimp, shellfish and plants were risk to be consumed
PERBANDINGAN HASIL BELAJAR KIMIA SISWA MENGGUNAKAN MODEL PEMBELAJARAN JIGSAW DAN THINK PAIR SHARE (TPS) DENGAN PENDEKATAN SCIENTIFIC PADA KELAS X IPA DI SMAN 3 KOTA BENGKULU TAHUN AJARAN 2018/2019 Pepi Pepi; Hermansyah Amir; Rina Elvia
ALOTROP Vol 3, No 2 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i2.10121

Abstract

This study aims to compare the Think Pair Share (TPS) and Jigsaw learning models with the Scientific approach to the results and interest in learning chemistry in the mole concept material in class X MIPA SMAN 3 Kota Bengkulu. This research was carried out in January-April 2019. This type of research was a quasi-experimental study with a population of all classes of X MIPA totaling 180 students. How to obtain samples through normality and homogeneity tests through cluster random sampling technique, where two classes of research samples were obtained, namely Experiment 1 class which applied Think Pair Share (TPS) learning model and experimental class 2 which applied the Jigsaw learning model. Based on the results of the study it was concluded that the two learning models proved to be able to increase students' learning outcomes and interest in chemistry and reach KKM, namely 76 with the acquisition of the N-Gain Score in the Think Pair Share (TPS) learning model of 0.71 and in the Jigsaw learning model of 0, 79 where both values of N-Gain Score have a high category. The results of students' interest in learning chemistry in the experimental class 1 were 75.93% with good categories and the results of the learning interest in the experimental class 2 were 82.01% with very good categories. The results of hypothesis testing through t test on the cognitive aspect sig. (2-tailed) of 0.002 and in the affective aspect of 0,000. It states that there are significant differences in the results and interest in learning chemistry that apply Think Pair Share (TPS) and Jigsaw learning models with the Scientific approach.
PREPARASI DAN KARAKTERISASI MIKROKRISTALIN SELULOSA (MCC) BERBAHAN BAKU TANDAN KOSONG KELAPA SAWIT (TKKS) Fepri Effendi; Rina Elvia; Hermansyah Amir
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4672

Abstract

[PREPARATION AND CHARACTERIZATION OF MICROCRYSTALLINE CELLULOSE (MCC) MADE FROM EMPTY PALM OIL BUNCHES (TKKS)] Empty Palm bunches (TKKS) is solid waste from industrial processing of oil palm (Elaeis guineensis Jacq) that have a high cellulose content.  This research aims to synthesize Microcrystalline Cellulose (MCC) from TKKS and determine the characteristics of the MCC produced. The manufacturing process begins with the MCC delignifikasi multistage pulping TKKS using mixed of 3.5% HNO3 and NaNO2 in temperatures of 90 ?C for 2 hours, followed by heating of a mixture of 2% NaOH and Na2SO3 2 % at temperature 50?C for 2 hours. The second stage of the lignification process is done using NaOH 17.5 %, followed by hydrolysis towards ?-Cellulose lignification results with heating in the aqueous solution of HCl at concentrations of 3, 3.5 and 4 M for 30, 45 and 60 minutes. From the results obtained from the hydrolysis of the optimum yield of 80.73 %, i.e., MCC that use concentration of HCl 3 M for 30 minutes.  MCC produced then analyzed using FTIR, XRD, and PSA. FTIR absorption for MCC results showed an of waves number on a 3375.43 cm-1 and 2899,01cm-1, indicating the presence of hydroxyl OH and CH.The results of the analysis with the PSA suggests that MCC has generated a measure of particle diameter 0.5281 µm. Using XRD analysis results that MCC has a degree of crystallinity of 86,79 %. And the results of testing the content of carbohydrates in MCC produced shows levels of carbohydrates of 88.36 %.
ANALISIS KEMAMPUAN BERPIKIR KRITIS SISWA PADA MATERI REAKSI REDUKSI OKSIDASI (REDOKS) DI MAN 1 KOTA BENGKULU Maya Riski Andraini; Salastri Rohiat; Rina Elvia
ALOTROP Vol 5, No 1 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i1.16484

Abstract

ISOLASI BAKTERI DARI TANAH TEMPAT PEMBANGAN AKHIR (TPA) AIR SEBAKUL SEBAGAI AGEN BIODEGRADASI LIMBAH PLASTIK POLYETHYLENE Desy Purnama Sari; Hermansyah Amir; Rina Elvia
ALOTROP Vol 4, No 2 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i2.13833

Abstract

This study aims to obtain the bacteria of Pseudomonas from the land of TPA Air Sebakul Bengkulu City as a plastic degrading agent and measure the ability of bacteria to degrade Low Density Polyethylene (LDPE) and Oxium plastic. The research was conducted from February to August 2019, at the Laboratory of Biology and Chemistry Learning, Faculty of Teacher Training and Education, University of Bengkulu. Air Sebakul landfill samples were taken at the coordinate point 3o49 '27.8 "S 102o20 '48.4" E. Isolation of plastic degrading bacteria using selective media King's B Agar added with 2% Polyethylen Glycol (PEG) to test the ability to develop bacterial isolates in plastic-based media. The steps of this research are bacterial isolation, bacterial purification and bacterial selection, macroscopic and microscopic identification of bacteria (Gram staining) and plastic biodegradation test with Mineral Salt Agar (MSM) media. Determination of the% weight loss of LDPE and oxium plastics in the biodegradation process was carried out for 30 days with time variations of 10, 20 and 30 days. The results of bacterial isolation based on morphological characteristics and gram staining test of P-1 bacterial isolate have similarities with Pseudomonas aeruginosa. So that the P-1 bacterial isolate is thought to be a Pseudomonas aeruginosa bacterium. The bidoegradation of LDPE and oxium plastics with isolates of P-1 bacteria for 10, 20 and 30 days respectively was able to degrade oxium plastics by 2.43, 5.17 and 9.86% while LDPE plastics by 1.13, 2 and 1 , 17%.
STUDI ANALISIS KESESUAIAN BUKU TEKS KIMIA SISWA SMA NEGERI KOTA BENGKULU BERDASARKAN STANDAR BSNP Rita Handayanti; Rina Elvia; Salastri Rohiat
ALOTROP Vol 5, No 1 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i1.16490

Abstract

PERBANDINGAN MODEL PEMBELAJARAN KOOPERATIF TIPE TEAM ASSISTED INDIVIDUALIZATION (TAI) DAN THINK PAIR SHARE (TPS) TERHADAP MINAT DAN HASIL BELAJAR KIMIA SISWA Elfrida Napitupuluh; Rina Elvia; Salastri Rohiat
ALOTROP Vol 5, No 1 (2021)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v5i1.16478

Abstract

Penelitian ini bertujuan untuk menentukan perbedaan minat dan hasil belajar kimia siswa dengan menggunakan model pembelajaran Team Assisted Individualization dan model pembelajaran Think Pair Share pada materi persamaan reaksi kimia di SMAN 8 Kota Bengkulu Tahun Ajaran 2018/2019. Penelitian ini dilakukan pada bulan Februari - April 2019. Jenis penelitian ini adalah kuasi eksperimen. Populasi penelitian ini adalah siswa kelas X MIA dengan jumlah populasi 136 siswa. Pengambilan sampel dilakukan setelah uji homogenitas dan normalitas maka terpilih kelas X MIA 2 yang menerapkan model Team Assisted Individualization dan X MIA 3 yang menerapkan model Think Pair Share sebagai sampel penelitian dengan teknik purposive sampling dengan jumlah sampel 68 siswa. Analisis data yang digunakan adalah rata-rata (mean), uji normalitas, uji homogenitas,uji N-Gain Score dan uji hipotesis (uji t). Hasil penelitian secara umum menunjukkan bahwa penerapan model Team Assisted Individualization mampu memberikan hasil belajar yang lebih tinggi dari model Think Pair Share. Data hasil belajar kimia siswa diperoleh dari nilai pretest dan postest dengan selisih hasil belajar untuk kelas eksperimen I adalah 59,411 dan kelas eksperimen II adalah 57,647, berdasarkan nilai pretest dan postest didapatkan perolehan nilai N-Gain Score pada kelas eksperimen 1 besar 0,765 dan kelas eksperimen 2 sebesar 0,707. Sedangkan minat belajar kimia siswa pada kedua kelas memperoleh persentase sebesar 81,272% untuk model pembelajaran Team Assisted Individualization dan 76,647% untuk model pembelajaran Think Pair Share. Hasil uji t pada aspek kognitif didapatkan nilai sig.(2-tailed) sebesar 0,013 dan pada aspek afektif minat belajr sebesar 0,000. Hal tersebut menyatakan bahwa terdapat perbedaan yang signifikan pada minat dan hasil belajar kimia yang menerapkan model pembelajaran Team Assisted Individualization dan Think Pair Share
Co-Authors Ahmad Fadli Zil Ikram Amrul Bahar Angga Aprian Dinata Anisa Rosmalara Areski Febriani Budiyanto Budiyanto Chrisnia Nurbaiti Citra Dwi Palenti Desy Purnama Sari Dewi Handayani Elfrida Napitupuluh Elvinawati Elvinawati Febrian Solikhin Fepri Effendi Finni Meyori Fitri Esa Madina Ghea Sefriza Pratiwi Hendry Nordan Hermansyah Amir I Nyoman Candra I Nyoman Chandra Intan Fadila M. Lutfi Firdaus Mantiko Parbo Maulana Maya Riski Andraini Mia Maysella Aditia Muzanip Alperi Nadia Amida Nurhamidah Nurhamidah Nurhamidah Nurlia Latifah Pangesti Dewi Pepi Pepi Rangga Putra Rika Juwita Saputri Rita Handayanti Rizki Karimullah Rovi Atahilah Salastri Rohiat Salastri Rohiat Shiba Meike Indira Shinta Lestari Siti Zaya Aisyahlika Sumpono Sumpono Sura Menda Ginting Weny Shintia Yola Dewi Putri