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All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Jurnal Ilmiah Biosaintropis (Bioscience-Tropic) Unri Conference Series: Community Engagement Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks
Drastinawati Drastinawati
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Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Engineering Environmental Science Medicine & Pharmacology Social Sciences Other

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Pemisahan Emas Pada Video Graphic Array (VGA) Komputer Dengan Metode Elektrolisis Dan Presipitasi Muhammad Nur Rahim Sjam; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Gold has been using in electronics and telecommunication industry, for example, Video Graphic Array (VGA) computer. To get the maximum results in the separation of the gold used variations potential difference ( 6; 9; 12 volt ) and the type of precipitant (NaHSO3 and H2C2O4) . In this study, 5 gram of samples VGA is electrolyzed by using H2SO4 for 1 hour. The precipitate formed is separated from the filtrate. The precipitate was dissolved in Aqua Regia at a temperature of 70˚C for 30 minutes further diluted with Aqua DM until the volume is 50 mL . Au concentration was analyzed by AAS (Atomic Absorption Spectrophotometry) and Au deposited with NaHSO3 and H2C2O4 . Based on the analysis result, the maximum Au concentration at the former VGA computer is equal to 181,36 ppm. For 5 grams of the sample , the maximum weight of Au precipitate obtained 1,07 grams by using NaHSO3 as a precipitant .Keywords : Au, VGA computer, Electrolysis, Precipitant
Sintesis Kitosan Dari Limbah Cangkang Kepiting Dengan Variasi Suhu Dan Waktu Pada Proses Deasetilasi Rusma Yanti; Drastinawati Drastinawati; Yusnimar Yusnimar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 2 Juli s/d Desember 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Chitosan is a biopolymer produced from the chitin deacetylation process that is widely present in the outer skin of crustacean animals such as shrimp and crabs. This study aims to determine the effect of temperature and reaction time on the deacetylation process and chitosan characterization analysis (yield, moisture content, ash content, and deacetylation degree). Crab shell crab with size of 100 mesh. The chitin found in the crab shell powder was isolated by deproteinization and demineralization processes. The resulting chitin is then transformed into chitosan by deacetylation process under operating conditions at 100 °C, 110 °C and 120 °C, 50% NaOH concentration, chitin mass ratio and NaOH volume 1:20 (b / v), stirring rate 150 rpm, and reaction time of 1 hour, 2 hours and 3 hours. The results showed that the higher the temperature and the duration of reaction time caused an increase in the degree of deacetylation and a decrease in yield and ash content, while the water content had no effect. Chitosan obtained has a yield of 38.14 - 60.36%, moisture content of 1.78 - 3.57%, ash content 0.75-1.75% and deacetylation degree 72,47 – 86,75%.Keywords: biopolymer, chitin, chitosan, deacetylation, deacetylation degree
Pemisahan Emas Pada PC Mainboard Komputer : Pengaruh Rasio Sampel : HNO3 Dan Jenis Presipitan Esti Rahmat Tini; Yusnimar Yusnimar; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Gold (Au) has been used widely in the electronics and telecommunications industries. In the Printed Circuit (PC mainboard, the former metal there are approximately 80-1000 ppm Au. In this study Au has been separated from PC Mainboard with treatment variation ratio of the amount of samples and HNO3 (1: 3; 1: 6; and 1: 9 w/v) and the type of precipitants (NaHSO3 and H2C2O4). Gold content was determined by Atomic Absorption Spectrophotometry. For 5 grams PC mainboard sample with a size of 1-10 mm was leaching with HNO 3 at T=70°C for 1 hour, the precipitate formed is separated from the filtrate. Then, the precipitate obtained was leaching with aqua regia at T=70°C for 30 minutes, the precipitate dissolved and further it diluted with aqua DM until it is volume 50 mL. Later, concentration Au is analyzed by AAS and Au are deposited using a precipitant H2C2O4 and NaHSO3. According to the result, content of Au in the PC mainboard is 300 ppm. For 5 grams amount of sample is obtained maximum weight of 2.14 grams Au deposition using H2C2O4 as a precipitant.Keywords: Au, leaching, PC Mainboard, precipitant.
Kinetika Reaksi Demineralisasi Pada Isolasi Kitin Dari Limbah Cangkang Udang Industri Ebi Ika Karina; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Chitin is natural polymer which used in biomedic sector mainly for injury healing, suture and dietery because chitin has antibacterial, antifungal and antiviral properties. Chitin content in natural material can be isolated using deproteinasi and demineralization process. This research objection is to determine demineralization reaction kinetics in chitin isolation with temperature and shrimp shell powder to HCl solution ratio. This research is started with 50 gr shrimp shell powder with 1 N HCl solution then heated with temperature such as 40°C and shrimp shell powder to HCl solution ratio such as 1:5, 1:10, 1:15 and 1:20 (gr/ml). Sample is taken with time interval 5, 10 and 15 minutes as much as 20 ml and washed until neutral pH. Next, sample is filtered using filter paper and then the solid part is analyzed in complexometry titration. Research result shows that reaction kinetics following pseudo second order and increasing of k value in a row of temperature increase is 0,00002 menit-1. Reaction rate constant in shrimp shell powder and HCl 1:5 (gr/ml) ratio is 0,000012 and increase to 0,00155 when ratio 1:20 (gr/ml) at 70oC.Key words : chitin, demineralization, kinetic reaction, polymer
Sintesis Komposit Magnetit/Hidroksiapatit Menggunakan Metode Hidrotermal Dengan Variasi Waktu Dan Konsentrasi FeCl3 Bima Wandika Putra; Ahmad Fadli; Drastinawati Drastinawati
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 1 Januari s/d Juni 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Magnetite / hydroxyapatite composite is a material that can be used as a drug carrier. The purpose of this study was analyzing variations in time and FeCl3 concentration on the characteristics of composites produced using the hydrothermal method. A total of 0.3248 gr FeCl3.6H2O (2 mmol or 0.05 M), sodium citrate 1.1764 gr (4 mmol or 0.10 M), and 0.3604 gr urea (6 mmol or 0.15 M) dissolved in 40 ml of distilled water, then 0.1 g of PEG (7.5 g/L) is added while stirring until it runs out, then added Hydroxyapatite powder as much as 30% by weight, stirring until it dissolves. After being put in a Teflon container. The container was put into an oven and set at 210 ° C. The reaction times used in this study were 5, 7, 9, 12 and 15 hours. Furthermore, it was carried out with the help of an external magnetic field (permanent magnet) so that the process can be carried out quickly and more effectively. Furthermore, it was settled by completion. The sample is then dried at oven temperature 120°C for 12 hours. The resulting composite powder was characterized by XRD, BET, TEM, and VSM. Increasing hydrothermal time to 15 hours at a concentration of 0.15 M, increasing the surface area of particles from 64.48 m2/gr to 67.41 m2 /gr. Where as the variation of higher FeCl3 concentration from 0.05 M to 0.15 M is the large size of magnetite crystals 18.41 nm to 22.77 nm. Variation of higher FeCl3 concentration enlarged the surface area of particles from 48.21 m2/gr to 67.41 m2/gr, increased magnetic saturation value from 13.24 emu / gr to 17.27 emu/gr, with the shape of the particles produced round shape measuring 15 nm.Keywords: composite, drug delivery, hydrothermal, hydroxyapatite, magnetite
Pengenalan cara membuat sabun colek kepada masyarakat Desa Pulau Payung Kecamatan Rumbio Jaya Kabupaten Kampar Desi Heltina; Drastinawati Drastinawati; Chairul Chairul; Mery Sukmiwati
Unri Conference Series: Community Engagement Vol 1 (2019): Seminar Nasional Pemberdayaan Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/unricsce.1.219-222

Abstract

Kebutuhan masyarakat meliputi sandang, pangan dan papan. Kebutuhan sandang dan pangan tidak terlepas dari proses pembersihan dan pencucian. Salah satu bahan yang digunakan untuk proses pencucian adalah sabun. Sabun colek banyak digunakan untuk kebutuhan rumah tangga karena bentuk sabun yang lembek, tidak basah, tidak kering sehingga mempermudah penggunaannya, yaitu mudah ditakar dan mudah digunakan untuk bagian-bagian yang sulit pada pakaian berkerah dan lipatan lengan. Untuk itu sabun colek menjadi alternatif dalam pemilihan jenis sabun. Jika sabun colek ini dapat dibuat sendiri maka akan dapat menghemat pengeluaran keuangan dan akan menjadi peluang usaha untuk masyarakat dalam upaya meningkatkan kemampuan wirausaha dalam memproduksi sabun sendiri pada skala kecil dan menengah untuk dijual ke Pasaran. Kegiatan pembuatan sabun ini akan dapat menambah pengetahuan masyarakat tentang ilmu dan teknologi serta dapat menambah pengetahuan tentang kewirausahaan. Pengabdian ini direncanakan dilaksanakan pada kelurahan Pulau Payung kecamatan Rumbio Jaya Kabupaten Kampar. Kegiatan dilakukan dengan metode dalam bentuk penyuluhan yaitu mengenalkan cara pembuatan sabun colek dengan metode ceramah, diskusi dan melakukan demonstrasi/praktek pembuatan sabun colek. Kegiatan ini juga mendukung program pemerintah dalam meningkatkan kemampuan masyarakat dalam memproduksi barang kebutuhan sehari hari untuk menghemat pengeluaran masyarakat dan pada akhirnya dapat meningkatkan kesejahteraan masyarakat.
Pelatihan Pembuatan Donat Praktis dengan Metode Autolisis di Lingkungan Dharma Wanita Persatuan Fakultas Teknik Universitas Riau Nurfatihayati Nurfatihayati; Anisa Mutamima; Cory Dian Alfarisi; Drastinawati Drastinawati; Yelmida A
Warta Pengabdian Andalas Vol 29 No 2 (2022)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jwa.29.2.123-129.2022

Abstract

Doughnuts are one of the most popular sweet foods for people of all ages around the world. Although made from simple ingredients such as flour, sugar, eggs, yeast, milk powder, salt, water, and margarine, however producing doughnuts requires special techniques to produce good-quality doughnuts. It needs more energy, even physically and electrical equipment. A workshop on doughnut production with autolyze method for Dharma Women Association, Faculty of Engineering, University of Riau, was conducted to increase the knowledge and skills of members of the organization in making healthy dishes for the family. In this workshop, doughnuts were made using the autolysis method, which is mixing bread flour with water and then keeping the dough until gluten was formed. The formation of gluten is one indicator of the formation of smooth, soft, and elastic dough. The workshop results showed high interest among the Dharma Women Association members in making doughnuts with this alternative method.
Pengaruh Penambahan Arang Pelepah Sawit terhadap Sifat Mekanik Batu Bata Merah Cory Dian Alfarisi; Padil Padil; Drastinawati Drastinawati; Wisrayetti Wisrayetti; Nurfatihayati Nurfatihayati; Yelmida A
Jurnal Ilmiah Biosaintropis (Bioscience-Tropic) Vol 8 No 2 (2023): Januari 2023
Publisher : Fakultas Matematika & Ilmu Pengetahuan Alam - Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/e-jbst.v8i2.498

Abstract

Brick is a building material that is often used for residential walls. The bricks in this study were bricks with the addition of palm frond charcoal in the manufacturing process. The aims of this study were (1) to determine the effect of adding palm stem charcoal on the manufacture of red bricks in terms of compressive strength, water absorption (Suction rate) and apparent density (apparent density). (2) Comparing the test results with the SNI 15-2094-2000 standard. The manufacture of experimental bricks begins with adding clay with pulverized palm frond charcoal in a ratio of 100:0, 95:5, 90:10, 85:15 and 80:20, then molded, dried, burned and tested for new mechanical properties. brick. In this study, the compressive strength of bricks that enter class 100 is a ratio of 100:0 and 95:5 namely 11.75 Mpa and 10.10 Mpa, then bricks grade 50 is a ratio of 90:10 and 85:15 which is 8.08 Mpa and 6.27 Mpa. The water absorption capacity of bricks that meet the requirements of SNI 15-2094-2000 is a ratio of 100:0 and 95:5, namely 18.65% and 19.74%. The apparent density of bricks that meet the requirements of SNI 15-2094-2000 are the ratios of 100:0, 95:5, 90:10 and 85:15, which are 1.63 g/cm3, 1.54 g/cm3, 1,37 g/cm3 and 1.24 g/cm3. Bricks that meet the standards and are recommended as masonry bricks are bricks with a ratio of 95:5.
Co-Authors Ahmad Fadli Aisyah Rani Alfarisi, Cory Dian Ayu Annisya Tri Adriana Bima Wandika Putra Chairul Chairul Desi Heltina Edo Prima Arif Esti Rahmat Tini Frederika Mawarni Adilasari Nduru Harfiah Faradila Idral Amri Ika Karina Jhon Alperdo Julharmito Julharmito Juliani Dafis Komalasari Komalasari Mery Sukmiwati Muhammad Nur Rahim Sjam Mutamima, Anisa Nurfatihayati Ongky Alexander Onil Andika Padil Padil Reny Nur Hidayah Restika Rahayu Ricson Rinaldi Rida Sari Juli Anti Roni Roni Rusma Yanti Silvia Reni Yenti Subkhan Maulana Wasty Rusjaya Wiriyan Jordy Wisrayetti Wisrayetti Wyda N Saragi Yelmida Azis Yesi Afriani Yusnimar Sahan