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Penggunaan metode ekstraksi maserasi dan partisi pada tumbuhan cocor bebek (kalanchoe pinnata) dengan kepolaran berbeda Tri Reksa Saputra; Agustinus Ngatin; Yunus Tonapa Sarungu
Jurnal Kimia Fullerene Vol 3 No 1 (2018): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (453.753 KB) | DOI: 10.37033/fjc.v3i1.26

Abstract

Has conducted research of the preparation Cocor Bebek plants as raw materials for corrosion test by using two methods of extraction are maceration and partition. Maceration process is done by using methanol, which will then be concentrated by using a rotary evaporator to produce concentrated methanol extract. The next stage is the process of partitioning using a solvent n-hexane and ethyl acetate, and of the steps that have been made, from the fresh leaves Cocor Bebek generated as much as 10.3 kg of concentrated methanol extract as much as 65.7442 g, n-hexane extract as much as 36.1452 g, and the ethyl acetate extract as much as 15.2711 g.
EXTRACT OF COCOR BEBEK (KALANCHOE PINNATA) AS A CORROSION INHIBITOR Saputra, Tri Reksa; Ngatin, Agustinus
Jurnal Bahan Alam Terbarukan Vol 6, No 2 (2017): December 2017 [Nationally Accredited]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v6i2.7949

Abstract

In this study, Cocor Bebek leaves (Kalanchoe pinnata) extract is studied for metal corrosion inhibitor. 10.3 kg of K. Pinnata leaves produce concentrated extract of methanol, n-hexane and ethyl acetate as much as 65.7442, 36.1452, and 15.2711 g respectively. The concentrated extracts were then used to determine the rate of corrosion. Corrosion rate test showed that extract of ethyl acetate can reduce corrosion rate of carbon steel in NaCl 3.5% from 2.954 mpy to 0.963 and 0.923 mpy using 500 ppm and 1000 ppm of extract consecutively. Corrosion rate of Cocor Bebek extract at addition of 500 ppm ethyl acetate in the solution of NaCl 3.5% is decreasing immediately. It was found that the carbon steel corrosion rate decrease as much 4.857 for 6 hours and continuously shows sharp decline until 24 hours of corrosion time. Corrosion rate is slowly decreasing till reach 1.694 mpy at corrosion time of 168 hours.
Pengaruh Pretreatment Larutan Zinkat terhadap Elektroplating Nikel-Krom pada Logam Aluminium Agustinus Ngatin; M Faizal; Fuad HM
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Pemanfaatan Hasil Kondensasi Oli Bekas Menjadi Bahan Aditif Aspal dengan Metode Sulfonasi Yunus Tonapa Sarungu; Agustinus Ngatin
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2019: PROSIDING SNTKK 2019
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

Fermentasi Jerami sebagai Pakan Tambahan Ternak Ruminansia Yunus Tonapa Sarungu; Agustinus Ngatin; Rony Pasonang Sihombing
Fluida Vol 13 No 1 (2020): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v13i1.1852

Abstract

ABSTRAK Jerami adalah limbah tanaman padi yang dapat digunakan sebagai bahan pakan ternak. Agar jerami tidak mengalami pembusukan, maka dilakukan proses fermentasi. Fermentasi merupakan proses pengubahan suatu zat dengan bantuan mikroorganisme dengan menghasilkan karbohidrat. Fermentasi divariasikan dengan waktu 7, 15 dan 21 hari menggunakan probiotik EM4 dan starbio. Rasio perbandingan bahan jerami dan probiotik yaitu 10:1. Dilakukan pengamatan pada hasil fermentasi untuk kandungan protein, karbohidrat sederhana, dan kadar air. Hasil penelitian menunjukkan bahwa jerami hasil fementasi berwarna cokelat, kadar protein dan glukosa meningkat. Kadar protein dengan penambahan probiotik EM4 naik dari 5,775% menjadi 18,06% dan penambahan starbio menaikkan kadar protein menjadi 14,07%. Fermentasi jerami dengan penambahan EM4 lebih efektif daripada starbio. Waktu fermentasi yang paling efektif adalah 15 hari. Kata kunci: Jerami, fermentasi, probiotik, EM4, starbio ABSTRACT Straw is rice crop waste which can be used as animal feed materials. To avoid straw to decay, the fermentation process is carried out. Fermentation is the process of changing a substance with the help of microorganisms to produce carbohydrates. Fermentation was varied for 7, 15 and 21 days using EM4 and starbio probiotics. The ratio of straw and probiotic is 10: 1. The results of fermentation were observed for protein, simple carbohydrates, and water content. The results showed that fermentation resulted in brown colour and icreases of protein and glucose levels. Protein levels with the addition of EM4 probiotics increase from 5.775% to 18.06% and addition of starbio increases the protein levels to 14.07%. Straw fermentation with the addition of EM4 is more effective than starbio. The most effective fermentation time is 15 days. Keywords: Straw, fermentation, probiotics, EM4, starbio,
Carbon Steel Corrosion In The Atmosphere, Cooling Water Systems, And Hot Water Gatot Subiyanto; Agustinus Ngatin
Fluida Vol 11 No 1 (2015): FLUIDA
Publisher : Jurusan Teknik Kimia, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v11i1.555

Abstract

Korosi merupakan proses kerusakan material akibat berinteraksi dengan lingkungan yang korosif. Untuk mempelajari proses korosi di industri, maka dilakukan pengujian korosi di atmosfer, simulasi dalam skala lab untuk sistem air pendingin dan sistem air panas. Pengujian korosi dilakukan pada material baja lunak dengan metode Coupon dan laju korosi dihitung berdasarkan metode kehilangan berat. Penelitian ini bertujuan untuk menentukan laju korosi di lingkungan atmosfer, air pendingin, dan air panas berdasarkan pengaruh waktu. Hasil pengujian korosi di atmosfer menunjukkan bahwa lingkungan sekitar laboratorium kimia (gedung A) masih sangat baik dengan laju korosi 0,39mpy, sistem air pendingin mencapai 3,52 mpy dan di sistem air panas mencapai 137,12 mpy. Produk korosi dari ke tiga sistem berupa lapisan berwarna coklat dari Fe2O3.xH2O atau FeO(OH) menempel di permukaan logam. Dari ketiga lingkungan yang menunjukkan laju korosi terbesar adalah di sistem air panas.Pengendalian dengan coating dan proteksi katodik anoda korban dapat menurunkan potensial baja sampai dibawah kriteria proteksi (<-850mV/CSE), untuk coating mencapai – 896 mV/CSE, proteksi katodik anoda korban Mg dapat mencapai – 1696 mV/CSE, sedangkan potensial baja telanjang -762 mv/CSE
Konversi Seng Dari Limbah Baterai Zn-C Menjadi Senyawa Seng Sulfat Agustinus Ngatin; Rony pasonang sihombing
JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Vol 5, No 2 (2021)
Publisher : State University of Malang or Universitas Negeri Malang (UM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (289.004 KB) | DOI: 10.17977/um0260v5i22021p013

Abstract

Baterai seng-karbon terdiri dari seng (Zn) tempat karbon (C) yang diselubungi mangan dioksida (MnO2) dan amonium klorida (NH4Cl) yang berupa pasta. Baterai Zn-C merupakan baterai primer yang  akhirnya akan dibuang sebagai limbah. Limbah baterai Zn-C mengandung limbah B3 yang membahayakan lingkungan. Untuk mengurangi limbah B3 ini dilakukan konversi pelat seng menjadi senyawa seng sulfat yang bermanfaat. Tujuan penelitian ini adalah menentukan jumlah asam sulfat yang diperlukan untuk mengkonversi  pelat seng menjadi seng sulfat dan dan efisiensi persen hasilnya. Proses konversi meliputi pre-treatment, pelarutan seng dalam bervariasi konsentrsi asam sulfat (5%, 10%, 15%, 20% , 25%, dan 30%) dalam volume 80 mL, pengadukan dengan 450 rpm,  dan pemanasan,  filtrasi,  dan kristalisasi. Kristal seng sulfat hepta hidrat terbentuk pada suhu ruangan. Hasil maksimum dicapai pada konsentrasi asam sulfat 30% dengan rasio seng dan asam sulfat 1: 1 dengan sedikit asam sulfat berlibih. Kondisi tersebut kristal ZnSO4.7H2O dihasilkan  sekitar 18,39 gram. dengan efisiensi. 83,71%.
EKSTRAKSI KULIT BUAH MANGGIS SECARA REFLUK DAN SOKLETASI MENGGUNAKAN PELARUT ETANOL Agustinus Ngatin; Mentik Hulupi
Prosiding Semnastek PROSIDING SEMNASTEK 2014
Publisher : Universitas Muhammadiyah Jakarta

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Abstract

Ekstrak kulit buah manggis mengandung xanthon dan antosianin. Xanthon merupakan senyawafenol yang dapat digunakan sebagai antioksidan yang terdapat dalam kulit buah manggis dengankadar  yang  tinggi  dan  memiliki  sifat  yang  baik  dan  bermanfaat  bagi  tubuh Antosianin  adalahkelompok  pigmen  yang  berwarna  merah  sampai  biru  yang  tersebar  dalam  tanaman. Pigmenantosianin berbentuk glikosida dan menjadi penyebab warna merah, biru, dan violet serta dapatmengalami perubahan selama penyimpanan dan pengolahan. Ekstrak kulit buah manggis dapatdiambil melalui proses ekstraksi. Penelitian ini bertujuan mengambil ekstrak secara sokletasi danrefluk menggunakan  pelarut etanol, menentukan pengaruh rasio serbuk kulit manggis dan etanolterhadap  ekstrak,  dan  menentukan  pengaruh  waktu  proses  dan  pengadukan  terhadap  ekstrak.Metode  prnelitian  dilakukan  secara  eksperimen  di  laboratorium  dengan  metode  sokletasi  danrefluk..  Kulit  manggis  dikeringkan,  dihancurkan,  dan  pengayakan  sehingga  diperoleh  serbukdengan ukuran 0,22 mm. Serbuk kulit manggis diekstraksi menggunakan pelarut etanol denganrasio (1:8 s.d 1: 12)  gram per mL, variasi waktu ekstraksi (30 s.d 80) menit.  Hasil penelitianmenunjukkan  bahwa  proses  ekstraksi  secara  refluk  menghasilkan  jumlah  ekstrak  lebih  tinggidaripada  secara  sokletasi  dalam  rasio  serbuk  kulit  manggis  dan  etanol  1:7,5  sampai  1:12,5dengan  yield  11,25%.  Proses  ekstraksi secara  refluk pada  suhu  600C  dengan  waktu  60  menitmenghasilkan ekstrak 1,5426 g atau 6,17% dengan rasio serbuk kulit manggis dan etanol 1:11.Pada rasio ini dengan kondisi proses ekstraksi secara refluk dengan pengadukan 700 rpm, suhu600C dan waktu proses 80 menit menghasilkan yield 16,71% dan tanpa pengadukan 12,66%.Ekstrak dalam larutan asam berwarna kuning dan basa berwarna coklat
Ekstraksi Daun Cocor Bebek Menggunakan Berbagai Pelarut Organik Sebagai Inhibitor Korosi Pada Lingkungan Asam Klorida Tri Reksa Saputra; Agustinus Ngatin
Jurnal Kimia Fullerene Vol 4 No 1 (2019): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (532.881 KB) | DOI: 10.37033/fjc.v4i1.50

Abstract

Research has been conducted on the extraction of cocor bebek leaves using organic solvents with various levels of solvent polarity. This is done to obtain which solvent has a corrosion inhibitor activity in the hydrochloric acid environment, where five fractions are obtained, namely n-hexane, ethyl acetate, acetone, acetic acid, and methanol. Based on quantitative analysis of cocor bebek leaf extract in variations in the polarity of solvents using a spectrophotometer with a wavelength of 511nm. The flavonoid content in cocor bebek leaf extract produced using acetone solvent showed the highest yield. Corrosion rate of carbon steel in 0.1M HCl solution; 0.05M; 0.01M with the addition of cocor bebek leaf extract decreased as the concentration of extract increased and reached the lowest decrease in the addition of extracts in acetone solvent around 200 ppm with a corrosion rate of 42.18 mpy in 0.1M HCl solution and at an increase in extract concentration there was a decrease does not show a significant reduction in corrosion rate. For 0.05M HCl solution and 0.01m concentration showed a decrease in corrosion rate until the addition of 1500 ppm extract. The results of the extract using acetone solvent showed the corrosion rate of carbon steel in 0.1M HCl solution; 0.05M; and 0.01M lower than the extract results with other solvents (ethyl acetate, methanol, and 5% acetic acid).
Konversi Karat Besi Menjadi Besi (III) Sulfat dan Pemanfaatannya Sebagai Adsorpsi Pewarna Tekstil: Iron Rust to Iron (III) Sulphate Conversion and the Utilization as Textile Dye Adsoption Ngatin Agustinus; Fatimah; Widya Fitria Nur Fauziah; Rony Pasonang Sihombing
KOVALEN: Jurnal Riset Kimia Vol. 6 No. 3 (2020): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2020.v6.i3.15308

Abstract

Iron rust was an iron oxide compound that was less attractive, dirty, brown in color, and could pollute the environment, causing water to turn brown. To minimize iron contamination, conversion was carried out into iron (III) sulfate which was useful as an adsorbent for textile dyes. The purpose of this study was to determine the effect of sulfuric acid concentration and volume of H2O2 10% used to convert iron rust into optimal iron (III) sulfate compounds. The method used was a laboratory experiment on a batch scale and the hydrate content in iron (III) sulfate was carried out by the gravimetric method and its ability as an adsorbent was carried out based on the adsorption of dyes using the spectrophotometric method. The results showed that a reactor filled with 3 grams of iron rust powder and 100 mL of sulfuric acid was stirred at 425 rpm at 80 0C for 30 minutes, added 15 ml 10% H2O2 followed by stirring and heating until the solution was saturated, cooled to form crystals. The crystalline yield in these conditions was the increase in sulfuric acid concentration which resulted in low process efficiency, namely 30.34% at 50% sulfuric acid concentration and 15 mL 10% H2O2. The addition of 10% H2O2 solution to 50 mL of 20% sulfuric acid solution and 3.0 grams of a carat as much as 5 mL-10 mL 10% H2O2 produced iron (III) sulfate with 26.53% process efficiency. Iron (III) sulfate is a white, light gray crystal with the chemical formula Fe2 (SO4)3.5 H2O which was a rhombic shaped crystal. and able to absorb the dye which showed that 1.0 g of iron (III) sulfate was able to absorb the highest amount of red dye in a volume of 100 mL of textile dye solution. Keywords: Iron rust, synthesis, iron (III), sulfuric acid, textile dyes