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Quantitative Analysis of Liquid by Quick Freezing Into Ice Using Nd-YAG Laser-Induced Atmospheric Plasma Yulianto Ichwan, Mohamad Infrawan; Suyanto, Hery; Suliyanti, Maria Margaretha; Hedwig, Rinda; Pardede, Marincan; Kagawa, Kiichiro; Lie, Tjung Jie; Kurniawan, Koo Hendrik
Journal of Engineering and Technological Sciences Vol 37, No 1 (2005)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.384 KB) | DOI: 10.5614/itbj.eng.sci.2005.37.1.4

Abstract

A new approach of quantitative analysis of liquid sample using laser ablation technique was developed. The liquid was immediately freezed using the mixture of dry ice and alcohol in weight ratio of 95% : 5%. As a result, an increase of the repulsion force from the sample surface will enable the generation of the laser-induced shock wave plasma which was difficult to carry out on liquid surface. The ice sample was then irradiated using Nd-YAG laser operated in its fundamental wavelength. In order to increase the signal to background ratio and to obtain a sharp atomic line spectra, helium gas was used instead of air. Dynamic characterization of the spatially integrated time profile of the Cu I 521.8 nm, Cu I 510.5 nm and Hα lines shows a shock excitation stage and cooling stage which is corresponded to our shock wave model even when the plasma was generated under atmospheric gas pressure. Further study of the time profile averaged temperature of the atmospheric plasma also shows an increase of temperature during the shock excitation stage followed by diminution of temperature during the cooling stage. An application of this technique was then applied to quantitative analysis of several liquid samples. A linear calibration curve which intercept at 0 point was obtained for all of the elements investigated in this study such as sodium, potassium, lithium, copper, silver, lead and aluminum. A detection limit of around 1 ppm was found for the above element. This new technique will contribute to a great extent of laser atomic emission spectrochemical analysis for liquid samples.
ANALISIS KUALITATIF PADA BATU KECUBUNG KOPI MENGGUNAKAN LIBS Ida Ayu Gede Kusuma Dewi; Hery Suyanto; Ida Bagus Alit Paramarta; K. Suastika
BULETIN FISIKA Vol 17 No 2 (2016): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

It has been conducted research on the qualitative analysis on amethyst coffee using LIBS.This study aims to determine the content of the element in amethyst coffee that can later be used as a comparison or reference further research in the elemental analysis amethyst coffee. With treatment, the laser irradiated amethyst coffee at 100 mJ, and the data retrieved by the accumulation of 3, delay time 1 µs and repetition as much as 3 points in different areas of each region analysis of depth function (Depth Profile) with 60 times the laser irradiation. The main element as a constituent amethyst Coffee is silicon (Si), Sodium (Na), calcium (Ca), potassium (K) and oxygen (O2), while the element on its outer surface is iron (Fe) and phosphorus (P) were analyzed using LIBS.
PERHITUNGAN TEMPERATUR PLASMA-LASER DENGAN METODE PERBANDINGAN INTENSITAS DUA GARIS EMISI ZINC (Zn) Suyanto, Hery
Telaah Vol 32, No 2 (2014)
Publisher : Research Center for Physics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/tel.32.2.180

Abstract

Telah dilakukan perhitungan temperatur plasma-laser dengan persamaan Boltzmann melalui metode perbandingan (rasio) intensitas emisi dua panjang gelombang dari atom netral zinc (Zn). Tujuan penelitian ini untuk memilih pasangan panjang gelombang yang mempunyai nilai temperatur dapat mewakili temperatur plasma zinc di sekitar waktu eksitasi plasma. Intensitas diperoleh dengan memfokuskan laser Nd-YAG (1064 nm, 7 ns) dengan energi 80 mJ ke permukaan lempengan sampel Zn (99.99%) di lingkungan udara 1 atm dan menghasilkan plasma. Intensitas-intensitas emisi foton atom netral Zn dalam plasma ditangkap oleh spektrometer yang mana memungkinkan dapat dibuat 5 kombinasi rasio intensitas emisi dua panjang gelombang yang memenuhi syarat Boltzmann. Dengan memvariasikan waktu tunda deteksi diperoleh data intensitas yang menunjukkan bahwa daerah eksitasi (shock-excitation state) terjadi di sekitar 5 ns. Berdasarkan persamaan Boltzmann dan dengan membandingan nilai intensitas dua panjang gelombang dari lima kombinasi atom netral Zn diperoleh temperatur rata-rata pada daerah eksitasi sebesar 3064 K, dengan rentang kesalahan maksimum 6%. Berdasarkan data dapat disimpulkan bahwa rasio (328.2 nm/472.2 nm) ini merupakan rasio pasangan dua panjang gelombang yang paling cocok untuk menentukan temperatur plasma atom Zn dengan kesalahan maksimum 1.68% dari nilai rata-rata temperatur.
ZEOLITE-MODIFIED CARBON PASTE ELECTRODE FOR DETERMINATION OF COPPER USING ANODIC STRIPPING VOLTAMMETRY METHOD Irdhawati, Irdhawati; Suyanto, Hery; Andani, Putu Yani
ALCHEMY Jurnal Penelitian Kimia Vol 13, No 1 (2017): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.13.1.1808.1-16

Abstract

In this research, the unmodified and modified carbon paste electrode with zeolite has been prepared, for determination of Cu(II) using anodic stripping voltammetry method. The parameters observed involved deposition time, scan rates, zeolite composition in carbon paste, and validation of working electrode. The optimum performance of carbon paste electrode modified with zeolite was applied for determination of Cu(II) in wastewater of the gong fabrication. The results of this research showed the optimum of deposition time and scan rates obtained at 410 s and 7.5 mV/s for unmodified carbon paste electrode, respectively. The optimum composition of zeolite-modifier is 20% from total graphite, with deposition time 380 s and scan rates 10 mV/s. The detection limit of the measurement of Cu(II) standard solution using unmodified carbon paste electrode is 46.13 ppb, is lower than unmodified carbon paste electrode, 99.93 ppb. Zeolite-modified carbon paste electrode has good precision and accuration. The concentration of Cu(II) in waste water of gong fabrication , using carbon paste electrode modified with zeolite is 93.54 ± 0.87 ppb.
Identifikasi Unsur Utama Penyusun Permukaan Bahan Baja Ringan dengan Laser-Induced Breakdown Spectroscopy (LIBS) Hery Suyanto
Jurnal Energi Dan Manufaktur Vol 6 No 2 (2013): Oktober 2013
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (211.161 KB)

Abstract

AbstrakIdentifikasi unsur utama penyusun permukaan bahan baja ringan telah dianalisis denganmenggunakan teknik laser-induced breakdown spectroscopy (LIBS). Identifikasi unsurdilakukan dengan pengambilan data setiap kedalaman 20 ?m hingga kedalaman 120 ?m daripermukaan yang mana disebut metode depth profile dengan meninjau homogenitas suatuunsur fungsi kedalaman. Data menunjukan ada tiga kelompok unsur penyusun permukaan(20–120 ?m) bahan baja ringan. Kelompok pertama, unsur Aluminium (Al) dan Zinc (Zn) yangmempunyai tingkat homogen tinggi sampai kedalaman 120 ?m dengan fluktuasi kurang dari 8% dan rata-rata konsentrasi masing-masing lebih besar dari 40,5%, sehingga unsur inimerupakan penyusun utama permukaan baja ringan. Kelompok kedua, unsur krom (Cr),Natrium (Na) dan kalsium (Ca) merupakan unsur penyusun dipermukaan hingga kedalaman 20?m dengan rata-rata konsentrasi masing-masing sebesar 3,9%. Kelompok ketiga yaitu unsurFe merupakan unsur penyusun baja ringan yang konsentrasinya meningkat denganbertambahnya kedalaman dan mulai homogen setelah kedalaman 100 ?m dengan rata-ratakonsentrasi sebesar 7.2 %.Kata kunci: Identifikasi unsur, baja ringan, LIBS, depth profile, homogenitas.AbstractThe identification of the main elements in the surface of steel was conducted by applying depthprofile method using Laser-Induced Breakdown spectroscopy (LIBS). The investigation basedon the homogenous of the elements as a function of the depth started from the surface till 120?m. The data show that there are three groups of the elements constructed in the surface ofsteel. The first group, alumina (Al) and Zinc (Zn), is host elements in the surface till 120 ?mwith a concentration more than 40.5 % of each and fluctuation is less than 8 %. The nextgroup, chromium (Cr), sodium (Na) and calcium (Ca) elements, is in the surface of steel till 20?m with average concentration of each is 3.9 %. The last group is iron (Fe) element where itsconcentration rises with the increasing of the depth till 100 ?m and its average concentration isabout 7.2 %.Keywords: Surface analysis, LIBS, depth profile, homogeneous.
KARAKTERISASI SPEKTRUM UNSUR Cu UNTUK MENGHITUNG INTENSITAS EMISI ATOM FUNGSI WAKTU TUNDA DENGAN MENGGUNAKAN METODE LASER INDUCED BREAKDOWN SPECTROSCOPY (LIBS) Wulansari Efrilinda Diah; Hery Suyanto; I Nengah Artawan
BULETIN FISIKA Vol 14 No 2 (2013): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

Laser-Induced Breakdown Spectroscopy (LIBS) is a spectroscopic method is highly reliable for atomic spectrochemical analysis both qualitatively and quantitatively. To achieve this, be aware of the detection parameters, one of which is a function of the atom emission intensity of detection delay time. In this study, plasma is generated by focusing the Nd-YAG laser (1064 nm, 7 ns) on the surface of solid Cu sample with 99.99% purity level at 1 atm pressure air environment. Plasma emission spectrometer was arrested by elements of Cu + HR 2500 with specifications: (wavelength range 200-870 nm, resolution 0.1 nm (FWHM), 7 detector CCDs with a combined 14.336 pixels) with variation detection delay time 0, 0.5, 1, 1.5, and 2 microseconds after the plasma formation and the energy varies the 60-160mJ. The data showed that the value of the Cu atom emission intensity 521.8 nm of the most highly visible on detection delay time decreased to 0.5 microseconds and detection delay time 2 microseconds. Based on these data it can be concluded that the characterization of the elements Cu to calculate the intensity was in the range of 100-140 mJ laser energy and time delay detection of 0.5 microseconds.
Analisis Hasil FTIR Dari Buah Kedondong dan Labu, Ubi Jalar dan Wortel Sebagai Bahan Alternatif Dye Sensitized Solar Cell (DSSC) Dengan Metode Multivariat Engelia Rambu Maramba Meha; Windarjoto Windarjoto; Hery Suyanto
BULETIN FISIKA Vol 23 No 2 (2022): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2022.v23.i02.p02

Abstract

Research has been carried out on the analysis of various kinds of fruit as an alternative material for Dye Sensitized Solar Cells (DSSC) using Fourier-Transform Infrared Spectroscopy (FTIR) with the Multivariate method. This study used 6 fruits as samples with 2 fruits as validators (mangosteen and dragon fruits) and 4 other fruits as an alternative fruit (Kedondong fruit, sweet potato, pumpkin and carrot). The sample was made into powder and then was analyzed by FTIR. The FTIR spectra data were processed by the Multivariate method, especially the PCA and Clustering algorithm. The results show that both sweet potato and Kedondong fruit can be used as alternative materials for Dye Sensitized Solar Cell (DSSC) whose characteristics are closer to Dragon fruit.
ANALISIS UNSUR Ag PADA SAMPEL CAIR DENGAN LASER INDUCED BREAKDOWN SPECTROSCOPY (LIBS) Sinaga Natalia Declarossy; Hery Suyanto; Manuntun Manurung
BULETIN FISIKA Vol 15 No 1 (2014): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

It has been done research on the analysis of Ag element in the liquid electrolyte with Laser Induced Breakdown Spectroscopy (LIBS) through electrolysis method. Observations conducted by LIBS using Nd-YAG laser (1064nm, 7ns). Prior to analyze, first looking for the optimum conditions of experiments had been done. The results showed that the optimum laser energy to the characterization of the elements Ag was 100 mJ and optimum conditions of electric current and time deposition on electrolysis process were 4.93 mA and 10 minutes, respectively. These conditions, next, for the application of quantitative analysis of Ag solution that started from concentration 300 ppm to the lowest concentration and limit of detection obtained 1 ppm.
APLIKASI KARBON GRAFIT UNTUK IMOBILISASI ION PB DALAM CAIRAN DENGAN METODE ELEKTROLISIS Ni Wayan Sariasih; Hery Suyanto; Nyoman Wendri
BULETIN FISIKA Vol 17 No 2 (2016): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

This study aims to determine the lowest concentration of Pb element that can be immobilized by carbon graphite with electrolysis method. Electrolysis used carbon electrodes of graphite as the anode and cathode with current of 52.7 mA. The concentrations of Pb solution used in this research started from of 100 till 0.1 ppm. Pb element deposited on the cathode then irradiated by Nd - YAG laser ( 1064 nm, pulse width 7 ns ) of 100 mJ and its emission intensity of 405.78 nm was captured by the spectrometer HR 2500+, then the data plotted in intensity as a function of wavelength . The optimum data of charged for the electrolysis process was 80 coulomb and minimum concentration (limit of detection) of Pb that was capable immobilized by carbon graphite was 0,06 ppm.
Identifikasi Bilangan Gelombang Daun Sirih (Piper sp.) Menggunakan Metode Spektroskopi Fourier Transform Infrared (FTIR) dan Principal Component Analysis (PCA) Ayu Anisa Damayanti; Ni Luh Putu Trisnawati; Hery Suyanto
BULETIN FISIKA Vol 22 No 2 (2021): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2021.v22.i02.p02

Abstract

Research has been carried out on the identification of betel leaf (Piper sp.) wavenumbers using Fourier transform infrared (FTIR) spectroscopy and Principal Component Analysis (PCA) methods. The kinds of betel leaf used are red betel (Piper Crocatum), green betel (Piper Betle L.), and black betel (Piper Betle V.). Tests were carried out on betel leaf powder with a betel mass ratio of 4:1 KBr, 0.011528 g and 0.002882 g, respectively. The results of characterization by FTIR showed the presence of functional groups C-H, C = O, C = N, C = C, C-N, C-O, and C-Cl on red, green, and black betel leaves. The results of the PCA analysis provide the value of the wave number which is the identity of betel in the range 1670-1679 cm-1 and strengthened by the results of the K-Nearest Neighborhood (KNN) analysis.