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Detection of Ethanol Adulteration in Citronellal Oil by using Near Infared Spectroscopy and Multivariate Data Analysis Meilina, Hesti; Supardan, M. Dani; Putra, Alfian; Kuroki, Shinichiro; Tsenkova, Roumiana
International Journal on Advanced Science, Engineering and Information Technology Vol 3, No 2 (2013)
Publisher : International Journal on Advanced Science, Engineering and Information Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18517/ijaseit.3.2.315

Abstract

Citronella oil is one of the essential oils obtained from the leaves and stems of different species of Cymbopogon. The oil is used extensively as a source of perfumery chemicals such as citronellal, citronellol and geraniol. These chemicals are use in soap, perfumery, cosmetic, flavouring industries and also insect repellent throughout the world. The objective of this study is to use Near Infrared Spectroscopy (NIRS) as a rapid analytical technique for quantitative assessment of purity in citronella oils. At first, the potential of NIRS in controlling and monitoring the quality of essential oil was investigated by diluting ethanol in different concentration as perturbation. Partial Least Square (PLS) regression method was used as a mathematical approach to detect and quantify ethanol. A number of wavelength ranges and data pretreatments were explored. The accuracy of these mathematical models was compared, and the most successful models were identified. The results demonstrate that NIRS technology was useful in the rapid and accurate detect and quantify ethanol in citronella oil.
Use of near-infrared spectroscopy for determining the characterization metal ion in aqueous solution Putra, Alfian; Meilina, Hesti; Tsenkova, Roumina
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering
Publisher : Syiah Kuala University

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Abstract

This study uses Aquaphotomics to measure Cadmium (Cd) and Magnesium (Mg) in aqueous solutions by analysing the changes in water spectra that occur due to water-metal interaction. Metals have no absorbance in the NIR spectral range, thus the methods developed so far have focused on detection of metal-organic complexes. Measurements were performed with Cd (II) and Mg(II) in 0.1 M HNO3, in the 680-1090 nm (water second and third overtones) and 1110-1800 nm (water first overtone) spectral regions, and were subjected to partial least-square regression analysis. Metal ions were scanned by NIRSystem 6500 using cuvette cell with 2 mm path length, in three consecutive days. Data for two days were used as data set and the rest of the data were used as prediction set. The calibration and prediction statistics obtained in this study indicated the potential of NIRS to predict metal ions in aqueous 0.1 M HNO3 solution with correlation coefficient (R2pred.>0.7). The RPD (residual predictive deviation) or ratio of standard error of prediction to the standard deviation, values were greater than 2, indicating that the model is appropriate for practical use (Cozzolino,2007). By using water matrix coordinates (WAMACS) from regression coefficient, obtained a consistency specific wavelength for each metal.. These results showed that the PLS model were able to detect character metal ions in the NIR region of electromagnetic spectra with high accuracy even at very low concentrations (0-10 ppm). 
Effect of plasticizer and fermetation time on cellulose membrane production and analysis of material property FARIDAH, .; PUTRA, ALFIAN; ELWINA, .; SAMI, M.; AZIZAH, NUR
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 4, No 1 (2014): Engineering
Publisher : Syiah Kuala University

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Abstract

This research has been carried out in cellulose membrane production from bacterial cellulose. Bacterial cellulose is produced from the fermentation process. The purpose of this study was to analysis the effect of cmc, glycerol and fermentation time towards cellulose membrane characteristics. Cellulose membrane made of a combination of coconut water and palm sugar juice as medium fermentation by using Acetobacter xylinum at 2, 4 and 6 days for fermentation time. Cellulose membrane obtained from a mixture of bacterial cellulose, cmc and glycerol. The addition of cmc and glycerol to improve cellulose membrane characteristics and performance. Based on the analysis results obtained the best performance at 4 days of fermentation time with a concentration of 1.5% cmc and 1.5% glycerol. The thickness of the cellulose membrane was almost the same for all samples and does not affect significantly towards the fermentation time for cellulose membrane production. Cellulose membrane has an asymmetric shape based on morphological analysis using SEM. Besides cellulose membrane has a similar pattern to the weight reduction and has the addition of heat resistance of the membrane. While the results of the IR spectra of cellulose membrane to detect the presence of OH groups, CO, C=C and CH groups that are characteristic of the polymer
Pemurnian Minyak Kelapa Sawit Menggunakan Membran Serat Berongga Arahman, Nasrul; Erika, Cut; Putra, Alfian
Agritech Vol 33, No 1 (2013)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/agritech.9564

Abstract

Characterization of modifi ed polyethersulfone hollow fi ber membranes were carried out in order to purify Palm Oil. Effect of membrane morphology on the separation performances of palm oil was investigated. The modiefi ed polyethersulfone hollow fi ber membrane was commercially availbale membrane prepared from the system of polyethersulfone/N-methylpirrolidone/polyvinilpyrrolidone, and polyethersulfone/N-methylpirrolidone/Tetronic 1307. Scanning electron microscopy results show that the modifi ed membranes has macrovoids structure larger than the original poliethersulfone membrane. The hydrophilicity property was also increased by addition of polymeric additive to the membrane system. The maximum fl ux of palm oil reached to 0.47 L/m2.hr. atm obtained from the experimenttal condition as applied pressure of 2.0 kg.cm2, by using membran polyethersulfone/N-methylpirrolidone/polyvinylpirrolidone.ABSTRAKKarakterisasi membran serat berongga (hollow fi ber) dari polimer polietersulfon yang telah dimodifi kasi untuk pemurnian minyak kelapa sawit telah dilakukan. Pengaruh morfologi membran dipelajari terhadap kemampuan pemisahan minyak kelapa sawit. Membran modifi kasi adalah membran komersial yang terbuat dari sistem polyethersulfone/Nmethylpirrolidone/polyvinilpyrrolidone,dan polyethersulfone/N-methylpirrolidone/Tetronic 1307. Hasil karakterisasi dengan SEM menunjukkan bahwa membran yang terbuat dari bahan PES/NMP/PVP, dan PES/NMP/Tetronic 1307 mempunyai struktur macrovoid yang lebih banyak dan ukuran yang lebih besar dibandingkan dengan membran yang terbuat dari bahan PES/NMP. Sifat hidrofilisitas membran campuran juga menjadi lebih baik jika dibandingkan dengan membran tunggal PES/NMP. Fluks minyak kelapa sawit terbesar diperoleh 0,27 L/m2.hr.atm pada kondisi tekanan operasi 2,0 kg/cm2 untuk membran hollow fi ber dari bahan PES/NMP/PVP.
Adsorption of Lead Ion in Water Solutions using Kaolin-Surfactant Modified as Adsorben Putra, Alfian; Lestari, Novia; Meilina, Hesti
Biopropal Industri Vol 6, No 2 (2015)
Publisher : Balai Riset dan Standardisasi Industri Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1850.679 KB)

Abstract

Kaolin is one of the natural adsorbent materials. The adsorption ability of kaolin is still low and need to be modified with organic compounds such as surfactants. This research aimed to optimize the lead adsorption in a waste water using modified kaolin. This study modified kaolin adsorben with cationic surfactants which have activated on temperature 300oC during 3 hours in a furnace. The comparison of kaolin and surfactant were 1:0, 1:2, 1:3 and 2:1, respectively while adsorption time were 30, 60 and 90 minute. Lead was used as the artificial waste at a concentration of 100 ppm. The waste from municipal reservoir water storage of Lhokseumawe was used as a benchmark and application. The sample was analyzed by using AAS and characterized by FTIR. The modified adsorben kaolin-surfactan 1:2 gained the highest reduction of efficiency 78% while the lead ion of municipal waste decreased from 4.65 ppm into 2.67 ppm.
ROBUST SPECTRAL MODEL FOR LOW METAL CONCENTRATION MEASUREMENT IN AQUEOUS SOLUTION REVEALS THE IMPORTANCE OF WATER ABSORBANCE BANDS Putra, Alfian; Faridah, Faridah; Inokuma, Emiko; Santo, Ryoko
Jurnal Sains dan Teknologi Reaksi Vol 8, No 1 (2010): Jurnal Sains dan Teknologi Reaksi
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v8i1.105

Abstract

In this study, we focused on detection of metal ions at low concentration in aqueous solution by using NIRS. New “aquaphotomics” concept (Tsenkova, 2007) has become a powerful strategy to understand the spectral changes related to small concentration of solutes in aqueous solution. To improve the model accuracy it is important to understand why it is possible to detect the object of interest using NIRS. Although detectable, metals have no absorption in NIR region (Sakudo,et,al, 2007). However it is perhaps due to their vibrational modes that are modulated by forming complexes with organic molecules containing C-H, N-H and O-H bonds. Therefore, alteration of the vibrational mode of water matrix caused by metal can be detected by NIRS. In this study, we present NIR spectroscopy link to aquaphotomics as a tool to predict low concentration (0-10.mg L-1) of Mg(II), Zn(II), Mn(II) and Cd(II).Key words : NIR spectroscopy, spectral changes, absorbance
Biodiesel Sumber Energi Alternatif Dari Tumbuh-Tumbuhan: Artikel Review Putra, Alfian; Meilina, Hesti
Jurnal Sains dan Teknologi Reaksi Vol 2, No 2 (2004): Jurnal Sains dan Teknologi Reaksi
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v2i2.25

Abstract

Biodiesel merupakan energi terbaru penganti energi solar yang dapat diperbaharuhi dengan mengunakan proses transesterifikasi yang bersumber dari minyak tumbuh-tumbuhan yang terdapat di alam. Biodiesel yang dihasilkan dengan proses tranesterifikasi ini sangat dipengaruhi oleh temperature, katalis, rata-rata pengadukan, kontak air dengan alkohol yang digunakan, dan jumlah sisanya. Biodiesel energi alternatif ini ramah lingkungan dan mudah di peroleh dengan proses yang sangat sederhana. Biodiesel yang baik sesuai dengan standar ASTM D6751.Key word : Biodiesel, energi, solar, transsesterifikasi
PEMBUATAN MEMBRAN SELULOSA ASETAT DARI TANDAN KOSONG KELAPA SAWIT Putra, Alfian
Jurnal Sains dan Teknologi Reaksi Vol 5, No 1 (2007): Jurnal Sains dan Teknologi Reaksi
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v5i1.43

Abstract

Membran  selulosa  asetat  dapat  dibuat  dari  Tandan  Kosong  Kelapa  Sawit  (TKKS),  dengan mengkonversi  TKKS menjadi pulp, dilanjutkan dengan pembentukan  selulosa asetat yang akan dibuat menjadi membran. Proses pembuatan selulosa asetat dari pulp TKKS adalah dengan melakukan reaksi asetilasi selulosa, yaitu menggunakan asetat anhidrat dan asetat glasial. Metode yang digunakan adalah dengan cara inversi fasa. Kondisi optimum pada proses asetilasi didapat pada suhu 1000C dengan kadar selulosa  asetat  61,4%  dan  kadar  asetil  36,39%.  Temperatur  dan  waktu  pengadukan  berpengaruh terhadap kekuatan tarik dan elongasi membran. Kekuatan tarik dan elongasi membran terbaik didapat pada kadar asetil 36,32% dengan kekuatan tarik 4,61 kgf/cm2 dan elongasi 5,23%. Kata Kunci: Pulp, asetil, inversi fasa, membran selulosa asetat.
PENURUNAN KESADAHAN AIR DENGAN MENGGUNAKAN METODE AERASI DIFUSI Yanti, Azmi; Helmi, Helmi; Putra, Alfian
Jurnal Sains dan Teknologi Reaksi Vol 11, No 2 (2013): Jurnal Sains dan Teknologi Reaksi
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (377.885 KB) | DOI: 10.30811/jstr.v11i2.175

Abstract

Air adalah elemen sangat penting dalam kehidupan manusia. Bagaimanapun air yang tercemar dapat menyebabkan berbagai permasalahan terutama bagi kesehatan manusia. Berdasarkan permasalahan yang terdapat dalam air minum, maka menurunkan kesadahan dari air minum adalah sangat penting. Oleh karena itu metode aerasi adalah metode yang cocok untuk tujuan tersebut. Sampel yang digunakan sebanyak 2liter dengan laju alir aerasi sebesar 2,6 L/ menit. Pengambilan sampel digunakan setiap 8, 10 dan 12 jam sekali. Sampel diperoleh dari 3 desa yaitu Punteut, Keude Aceh, dan Kandang. Hasil penelitian menunjukkan bahwa penurunan kesadahan terjadi pada kondisi aerasi selama 12 jam yang meliputi desa Punteut, Keude Aceh dan Kandang dengan % removale asing-masing 86, 6 % untuk sampel air sumur desa Punteut, 68, 3 % untuk sampel air desa Keude Aceh dan 77, 8 % untuk sampel air sumur desa Kandang. Hasil ini menunjukkan bahwa penurunan kesadahan dengan teknik aerasi difusi dapat menurunkan tingkat kesadahan air serta memenuhi standar mutu air minum.Kata kunci: Aerasi, Difusi, Kesadahan, Kalsium, Magnesium
PELUANG PENGOLAHAN LIMBAH INDUSTRI DENGAN REVERSE OSMOSIS Putra, Alfian
Jurnal Sains dan Teknologi Reaksi Vol 1, No 2 (2003): Jurnal Sains dan Teknologi Reaksi
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jstr.v1i2.32

Abstract

Permulaan ekonomi industri, kebutuhan air bersih dalam jumlah yang sangat besar telah menjadi faktor utama dalam pemilihan lokasi pabrik. Dimasa lalu industri menggunakan air dari sungai-sungai dan danau-danau kemudian mengembalikannya tanpa mempertimbangkan kontaminan. Saat sekarang ini para pimpinan industri mulai sadar akan tanggung jawab mereka pada publik dan pertimbangan pengolahan limbah yang cukup, sebagai bagian integral dari biaya pelaksanaan bisnis (usaha), dan banyak upaya mereka untuk menarik perhatian publik.Keywords : Osmosis, limbah, industri