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Utilization of Coal Bottom Ash a Low-Cost Adsorbent for the Removal Acid Red 114 Dye Kuntari Kuntari; Nurul Hidayat Aprilita; Suherman Suherman
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 17, ISSUE 1, February 2017
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol17.iss1.art2

A research about adsorption of acid red 114 using coal bottom ash has been conducted. This research was aimed to examine the ability of coal bottom ash in acid red 114 adsorption. Some adsorption parameters i.e. dosage adsorbent, contact time and pH medium were examined in the adsorption processes. The characterization of coal bottom ash was determined using X-Ray Diffraction. Acid red 114 concentration is measured by using UV-Visible spectrophotometer. The adsorption percentage of acid red 114 on the coal bottom ash is 91.2% at pH 1.5; contact time 80 min, acid red 114 concentration 10 mg/L for every 1.5 g bottom ash.

Kinetic and Isotherm Studies of Nitrate Adsorption in Salt Water Using Modified Zeolite Kuntari Kuntari
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 2 Year 2021 (June 2021)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.2.10312.286-292

Nitrate is the main form of nitrogen species in natural waters. Excessive nitrate concentration in water is highly undesirable, so that removal of the excessive nitrates in waters is very important. However, the challenge is purposed to remove the excessive nitrates in sea waters by considering anions-rich sea water. Adsorption is a favorable method for the nitrate removal process. Therefore, this research was aimed to study the kinetics and isotherm of nitrates adsorption in salt water. The adsorbent preparation was done by modifying natural zeolite with iron oxide. The adsorbent characterization was carried out by FT-IR spectroscopy and Gas Sorption Analyis methods. The results showed that the modified zeolite have Fe−O group vibrations as indicated by a peak at a wave number of 1404.18 cm−1 and an increased specific surface area. The modified zeolite is capable of adsorbing nitrate ions. The adsorption isotherms studies indicated that the modified zeolite is appropriate to the Dubinin-Radushkevich model. The average adsorption energy value (ED), obtained based on the Dubinin-Radushkevich isotherm <2 kJ/mole, showed that the nitrate adsorption on zeolite surface occurred physically. The most suitable adsorption kinetics model is the pseudo second order with the rate constant of 1.80´10−2 g/mg.min. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

PENENTUAN KADAR NITRIT PADA KANGKUNG MENGGUNAKAN SPEKTROFOTOMETRI UV-VISIBLE Kuntari Kuntari; Popi Yuliana; Thorikul Huda
JEDCHEM (JOURNAL EDUCATION AND CHEMISTRY) Vol 4 No 2 (2022): Jurnal Pendidikan, Pendidikan Kimia, dan Ilmu Kimia
Publisher : LEMBAGA PENELITIAN DAN PENGABDIAN MASYARAKAT (LPPM) UNIKS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/jedchem.v0i0.2453

The method of determining the nitrite content of water spinach has been conducted using UV-Visible spectrophotometry. The purpose of this research is to determine nitrite level in water spinach and to test linearity, precision, limit of detection (LOD) and limit of quantification (LOQ) for uv-visible spectrophotometry. Based on the linearity test, the equation of the line y = 1.076x + 0.0201 is obtained with a coefficient of determination (R2) of 0.9995. In determining precision, the value of nitrite level is 0,0740 mg/Kg with % RPD value is 16.71%. The LOD value of 0,0485 mg/L NaNO2 and LOQ value of 0,1617 mg/L NaNO2. Based on these results, improvements need to be made so that the sample concentration is above the LOD so that the nitrite level can be measured accurately and pricise.

Validasi Metode Penentuan Amonium Klorida dalam Obat Batuk Hitam secara Titrimetri Kuntari Kuntari; Toni Aprianto; Baruji Baruji; Rani Hidayati Noor
Indonesian Journal of Chemical Analysis (IJCA) Vol. 1 No. 01 (2018): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol1.iss1.art5

Amonium klorida merupakan zat aktif dalam obat batuk hitam yang berfungsi sebagai pengencer dahak. Penentuan kadar amonium klorida dalam sediaan obat menjadi sangat penting untuk uji kualitas produk agar obat memiliki khasiat dan keamanan yang dapat diterima pasien. Berdasarkan Farmakope V penentuan amonium klorida dapat dilakukan dengan metode argentometri. Analisis kadar amonium dalam obat batuk hitam secara argentometri belum tersedia data validasinya. Oleh karena itu perlu dilakukan validasi. Parameter validasi yang dijadikan acuan adalah akurasi, presisi, linearitas, batas deteksi dan nilai estimasi ketidakpastian pengukuran. Berdasarkan hasil yang diperoleh dalam penelitian parameter uji validasi untuk akurasi, ripitabilitas (%RSD), presisi antara (%RSD), linearitas (R2) dan estimasi ketidakpastian pengukuran secara berurutan yaitu sebesar 99,97-104,85%; 0,50-3,40%; 6,58%; 0,9985 dan 1,42 mg/5mL sehingga dapat disimpulkan bahwa metode penentuan amonium klorida dalam obat batuk hitam menggunakan metode titrasi argentometri belum cukup bukti untuk dinyatakan valid karena presisi atau keterulangan belum memenuhi syarat keberterimaan.

Penentuan Kafein dan Parasetamol dalam Sediaan Obat Secara Simultan Menggunakan Spektrofotometer UV-Vis Ade Irna Novita Sari; Kuntari Kuntari
Indonesian Journal of Chemical Analysis (IJCA) Vol. 2 No. 01 (2019): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol2.iss1.art3

Analisis sampel obat multikomponen dapat dilakukan dengan cara yang praktis menggunakan spektrofotometri UV-Vis secara simultan. Sampel yang digunakan merupakan sediaan obat sakit kepala multikomponen yang terdiri dari kafein, parasetamol, dan zat tambahan lainnya dengan preparasi yang berbeda yaitu pengenceran 80 kali dan 100 kali. Pengujian ini dilakukan bertujuan untuk menentukan kadar parasetamol dan kafein pada obat multikomponen secara simultan. Sampel diukur pada dua panjang gelombang yang berbeda yakni 244 nm dan 273 nm. Kadar parasetamol dalam sampel dengan pengenceran 80 kali dan 100 kali berturut-turut sebesar 88,80 mg/100 mg dan 87,75 mg/100 mg. Sedangkan kadar kafein dalam sampel dengan pengenceran 80 kali dan 100 kali berturut-turut sebesar 9,37 mg/100 mg dan 8,26 mg/100 mg. Pengenceran larutan sampel berpengaruh terhadap kadar yang diperoleh, semakin besar pengenceran maka semakin kecil kadar yang dihasilkan.

Method Validation and Estimation of Measurement Uncertainty in the Determination of Total Polyphenols Content in Land Spinach by UV-Vis Spectrophotometry Kuntari; Hasby S. Pandhyta
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp176-182

Land spinach contains polyphenols which can be determined by the spectrophotometry method. Data on method validation and estimation of uncertainty measurement of polyphenols in land spinach are not yet available, so method validation and estimation of uncertainty measurement of polyphenol content determination were carried out using a UV-Vis spectrophotometer. The validation parameters of the tested methods include linearity, precision, accuracy, and LOD and LOQ. Analysis of total polyphenol content was carried out using the Folin-Ciocalteu method with the gallic acid standard. Based on the results of method validation, the equation of the line y = 0.7213x-0.0096 with a coefficient of determination (R2) is 0.9994. These results indicate that the correlation between standard concentrations of gallic acid and absorbance shows good linearity. Repeated measurements showed the average total polyphenol content and the estimated measurement uncertainty value was (3.0501±0,2886) mg/Kg GAE. The RSD percentage was obtained at 1.79% were the result entered the acceptance condition because it was ≤ 2%. Percent recovery was obtained at 81.50% and 85.66%, and the terms of acceptance range between 80-110%. The LOD and LOQ values obtained were 0.1024 mg/L and 0.3412 mg/L. Based on the data obtained, it can be said that the method used has good validity.

Kinetic and Isotherm Studies of Nitrate Adsorption in Salt Water Using Modified Zeolite Kuntari Kuntari
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 2 Year 2021 (June 2021)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.2.10312.286-292

Nitrate is the main form of nitrogen species in natural waters. Excessive nitrate concentration in water is highly undesirable, so that removal of the excessive nitrates in waters is very important. However, the challenge is purposed to remove the excessive nitrates in sea waters by considering anions-rich sea water. Adsorption is a favorable method for the nitrate removal process. Therefore, this research was aimed to study the kinetics and isotherm of nitrates adsorption in salt water. The adsorbent preparation was done by modifying natural zeolite with iron oxide. The adsorbent characterization was carried out by FT-IR spectroscopy and Gas Sorption Analyis methods. The results showed that the modified zeolite have Fe−O group vibrations as indicated by a peak at a wave number of 1404.18 cm−1 and an increased specific surface area. The modified zeolite is capable of adsorbing nitrate ions. The adsorption isotherms studies indicated that the modified zeolite is appropriate to the Dubinin-Radushkevich model. The average adsorption energy value (ED), obtained based on the Dubinin-Radushkevich isotherm <2 kJ/mole, showed that the nitrate adsorption on zeolite surface occurred physically. The most suitable adsorption kinetics model is the pseudo second order with the rate constant of 1.80´10−2 g/mg.min. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Method Validation and Estimation of Measurement Uncertainty in the Determination of Total Polyphenols Content in Land Spinach by UV-Vis Spectrophotometry Kuntari; Hasby S. Pandhyta
Jurnal Akademika Kimia Vol. 11 No. 3 (2022)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2022.v11.i3.pp176-182

Land spinach contains polyphenols which can be determined by the spectrophotometry method. Data on method validation and estimation of uncertainty measurement of polyphenols in land spinach are not yet available, so method validation and estimation of uncertainty measurement of polyphenol content determination were carried out using a UV-Vis spectrophotometer. The validation parameters of the tested methods include linearity, precision, accuracy, and LOD and LOQ. Analysis of total polyphenol content was carried out using the Folin-Ciocalteu method with the gallic acid standard. Based on the results of method validation, the equation of the line y = 0.7213x-0.0096 with a coefficient of determination (R2) is 0.9994. These results indicate that the correlation between standard concentrations of gallic acid and absorbance shows good linearity. Repeated measurements showed the average total polyphenol content and the estimated measurement uncertainty value was (3.0501±0,2886) mg/Kg GAE. The RSD percentage was obtained at 1.79% were the result entered the acceptance condition because it was ≤ 2%. Percent recovery was obtained at 81.50% and 85.66%, and the terms of acceptance range between 80-110%. The LOD and LOQ values obtained were 0.1024 mg/L and 0.3412 mg/L. Based on the data obtained, it can be said that the method used has good validity.

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