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All Journal PROSIDING SEMINAR KIMIA KOVALEN: Jurnal Riset Kimia Jurnal Kimia Mulawarman JURNAL ATOMIK
Bohari Yusuf
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science

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PEMANFAATAN LIMBAH TONGKOL JAGUNG (Zea mays L.) SEBAGAI ARANG AKTIF DALAM MENURUNKAN KADAR AMONIA, NITRIT DAN NITRAT PADA LIMBAH CAIR INDUSTRI TAHU MENGGUNAKAN TEKNIK CELUP Azwar Amin; Saibun Sitorus; Bohari Yusuf
JURNAL KIMIA MULAWARMAN Vol 13 No 2 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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A research about utilization of waste corncob (Zea may L.) as active charcoal in reduction ammonia, nitrite and nitrate levels on industrial tofu liquid waste using dye technique have been researched. The purpose of this research to know reduction levels of industrial tofu liquid waste from some parameter is ammonia, nitrite and nitrate by using 2 variations is contact time and pH tofu liquid waste. The percentage yield of research to show of reduction ammonia, nitrite and nitrate levels at the optimum contact time 10 minute and the optimum pH 6 that is 51,29%, 31,93% and 58,71%. And then analyzed of data by using ANOVA test to know Fcount influence of the contact time of active charcoal to reduction ammonia, nitrite and nitrate levels on industrial tofu liquid waste that is 2,4891 less than Ftable 3,00. It is stated that is no significant effet on the reduction ammonia, nitrite and nitrate levels of industrial tofu liquid waste by using variation contact time active charcoal. While Fcount influence of optimum pH industrial tofu liquid waste to reduction ammonia, nitrite and nitrate levels on industrial tofu liquid waste that is 5,7168 more than Ftable 2,07. It is stated that is a significant effet on the reduction ammonia, nitrite and nitrate levels of industrial tofu liquid waste by using variation optimum pH industrial tofu liquid waste.
Penurunan Kadar Cr+3 [Kromium(III)] dan TSS (Total Suspended Solid) Pada Limbah Cair Laboratorium Dengan Penggunaan Metode Presipitasi Isma Avessa; Bohari Yusuf; Alimuddin Alimuddin
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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The aims of this research was to decrease the level chromium and TSS in the laboratory wastewater liquid sample PT SUCOFINDO by using calcium hydroxide and sodium hydroxide. Precipitation process was done by reacting the wastewater sample and solution Ca(OH)2 0,2 and NaOH 1 M at pH variation 7, 8, 9, 10 and 11, then allowed to settle for 24 hours and established the optimal pH at both solution was used in the precipitation process. Analysis content of Cr metal at this research using AAS instrument and analysis for content of TSS in this research using gravimetric method. The optimal pH precipitation to decrease Cr metal and TSS level is 8 in each of the solution used. Cr metal level after precipitation using Ca(OH)2 solution at pH 8 is 0.0901 mg/L and TSS level is 0.005 mg/L. Cr metal level after precipitation using NaOH at pH 8 is 0.0935 mg/L and TSS level is 0.008 mg/L. If compared with level decrease of Cr metal and TSS in laboratory wastewater using Ca(OH)2 and NaOH solution, and found the effectiveness of solution that have better efficiency to reduce levels of Cr and TSS in the low concentration is calcium hydroxide.
PEMBUATAN ETANOL DARI KULIT PISANG MAHULI (Musa paradisiaca. var sapientum) Suaibatul Aslamiah; Bohari Yusuf; Rudi Kartika
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Pembuatan etanol dari kulit pisang mahuli (Musa paradisiaca. var sapientum) telah dilakukan. Metode yang digunakan dalam penelitian ini adalah hidrolisis enzimatis yaitu mengubah pati menjadi glukosa dengan bantuan enzim α-amilase dan gluko-amilase, kemudian dilanjutkan dengan penambahan nutrisi urea serta proses fermentasi alkohol dan destilasi. Hasil fermentasi kemudian dianalisa menggunakan Kromatografi Gas. Konsentrasi etanol yang optimum didapatkan pada fermentasi hari keempat sebesar 6,212% dengan konsentrasi urea optimum yaitu 0,5%.
PERBANDINGAN KINERJA ANALITIK HASIL PENENTUAN ION LOGAM Pb DENGAN MENGGUNAKAN SPEKTROFOTOMETER SERAPAN ATOM DI BERBAGAI LABORATORIUM SAMARINDA arifin syam syam; bohari Yusuf; Aman Sentosa Panggabean
JURNAL ATOMIK Vol 6 No 2 (2021)
Publisher : Jurusan Kimia FMIPA UNMUL

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The study about the comparison of analytical performance of the determination of Pb metal ions using Atomic Absorption Spectrophotometer in various laboratories in samarinda has been conducted. The validated methods are linearity, detection limits, quantity and precision limits. The results showed, a standardized regression test obtained by laboratory A, a value of R2 ≥ 0.4103, laboratory B a value of R2 ≥ 0.983 and laboratory C, a value of R2 ≥ 0.000. The detection limit found at laboratory A was 0.6728 µg/L, laboratory B was 0.1989 µg/L and laboratory C was 0.0001 µg/L. The quantization limit obtained by laboratory A was 0.6817 µg/L, laboratory B was 0.6063 µg/L and laboratory C was 0.0001 µg/L. The precision test of laboratory A was 7.2208, laboratory B was 5.4557 and laboratory C was 0,000. The result of determining Pb of gas station soil samples in laboratory A is 0.737 µg/L and laboratory B is 0.391 µg/L, so that means they have exceeded the quality standards set by the Indonesian National Standard (INS).
ADSORPSI ION KADMIUM (Cd2+) MENGGUNAKAN ADSORBEN DARI AMPAS TEH DENGAN METODE KOLOM Savitri Nur Bahriana; Bohari Yusuf; Teguh Wirawan
PROSIDING SEMINAR KIMIA Vol 1 No 2 (2023): Prosiding SNKT II 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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The adsorption of cadmium ions (Cd2+) using adsorbent from tea waste by column method has been carried out. The purpose of this study is to utilize tea waste as an adsorbent to adsorb cadmium ions. The preparation tea waste was washed with hot water until the filtrate is colorless, then the dried tea waste was crushed and sieved using a 60 mesh sieve. In this study, the adsorption process used the batch method and column method. Determination of metal ions concentration of cadmium complexed with dithizone and measured with UV-Vis spectrophotometer at 518 nm. The optimum conditions of cadmium metal adsorption using adsorbent from tea waste by batch method at 10-minute contact time, pH 10, and the maximum adsorption capacity of 157.1282 mg/g. The adsorption process with optimum column method at 4.10 mL/minute flow rate and the maximum adsorption capacity of 68.8817 mg/g. The cadmium metal ions adsorption process follows the Langmuir isotherm type. Keywords: Adsorption, Tea Waste, Cadmium, Column Method.
ADSORPSI LOGAM KADMIUM (Cd) MENGGUNAKAN ADSORBEN AMPAS TEH DENGAN METODE CELUP Tiara Izza Nafila; Bohari Yusuf; Teguh Wirawan
PROSIDING SEMINAR KIMIA Vol 1 No 2 (2023): Prosiding SNKT II 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Tea waste adsorbent can be utilized for cadmium metal adsorption. The aim of this study was to determine the optimumcontact time, optimum pH, and maximum adsorption capacity using the batch method and the dip method. The concentration of cadmium was determined by complexing using dithizone and measured using a UV-Vis spectrophotometer at a wavelength oh 518 nm. The results were obtained in the batch method at the optimum contact tme of 10 minutes, the optimum pH of 10, and teh maximum adsorption capacity of 157,1282 mg/g. in the dip method the optimum contact time was 30 minutes, and the maximum adsorption capcity was 76,7932 mg/g. the type of isotherm obtained on the adsorption of cadmium metal oh the tea dregs adsorbent was the Langmuir isotherm. Keywords: Tea dregs, adsorption, cadmium, dip method
Kinerja Analitik Mikrokapsul Magnetit - Alginat (MNPs-ALG) untuk Analisis Ion Logam Cu(II) dan Aplikasinya pada Sampel Alam: Analytical Performance of Magnetite - Alginate Microcapsules (MNPs-ALG) for Analysis of Cu(II) Metal Ions and Their Application in Samples Lianasari, Ika Yekti; Aman Sentosa Panggabean; Bohari Yusuf; Alimuddin; Koesnarpadi, Soerja
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 1 (2024): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2024.v10.i1.16574

Abstract

Research has been carried out regarding the synthesis of Magnetite-Alginate microcapsules (MNPs-ALG) and applied to Cu (II) metal ions. The nature of magnetic nanoparticles, Fe3O4 which easily form aggregations can be overcome by this encapsulation process, but a very efficient separation process is also very much needed in the analytical separation process.The process of making magnetite nanoparticle compounds is carried out first using FeCl2.4H2O and FeCl3.6H2O and adding concentrated ammonia at a temperature of 90οC until the solution becomes blackish in color. The dry magnetite, Fe3O4, nanoparticles were then dissolved in distilled water and thickened with Na-Alginate then dropped slowly into a 1 M CaCl2 solution. The results of characterization using SEM showed that there were differences in morphology before and after contact, and there was 0.98% mass of Cu elements on the EDS results.The microcapsule adsorption optimization test gave results for the best adsorption percentage >90% on a mass variation of magnetite (MNPs) of 0.3 grams; pH 5; contact time of 30 minutes and retention capacity of 185.95 mg/gram, at a Cu(II) concentration of 800 ppm. Analytical performance shows the best results with linearity parameters with a correlation coefficient of 0.999; the detection limit and quantitation limit are 0.0516 ppb and 0.1720 ppb with a lifetime of four times. The application of samples in the form of river water samples shows a percent recovery value of around >90%, indicating that there is no matrix that significantly influences the measurements.
Co-Authors Agustin Pratiwi Alimuddin Alimuddin Alimuddin Aman Sentosa Panggabean arifin syam syam Azwar Amin Firman Arif Saputra Indra Kurniawan Isma Avessa Lianasari, Ika Yekti Manja’a Khasanah Moh Syaiful Arif Moh. Syaiful Arif Nur Asmawati Rahmat Gunawan Rientha Septiana Rudi Kartika, Rudi Rusnawati Rusnawati Saibun Sitorus Savitri Nur Bahriana Selvi Yanti Soerja Koesnarpadi Suaibatul Aslamiah Suci Andriyaningrum Syafrizal Syafrizal Teguh Wirawan Tiara Izza Nafila Yuni Astria