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All Journal Jurnal Pengelolaan Laboratorium Pendidikan Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Jurna Beta Kimia
Erlangga, Manasye
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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Penentuan Kualitas Kaolin sebagai Prekursor Sintesis Zeolit pada Kegiatan Praktikum Ismail, Rohmat; Erlangga, Manasye; Himawan, Ari; Afiah, Givana Indah Nurul
Jurnal Pengelolaan Laboratorium Pendidikan Vol. 7 No. 2, Juli 2025
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jplp.7.2.81-90

Abstract

Zeolite synthesis has attracted the attention of researchers today because of the functional properties of zeolites. The zeolite synthesis process can be influenced by various factors, one of which is the quality of the zeolite precursor. One of the precursor materials for zeolite synthesis is kaolin. This study aims to determine the quality of three kaolin brands used as precursors for zeolite synthesis in practicum activities. The quality of kaolin was assessed through gravimetric loss on ignition testing and analysis of the metal oxide composition using an X-ray fluorescence (XRF) spectrometer. The loss on ignition analysis results for kaolin A, kaolin B, and kaolin C samples were 7.94%, 7.87%, and 6.52%, respectively. The XRF analysis results, which included the compositions of SiO2, TiO2, Al2O3, Fe2O3, CaO, MgO, K2O and Na2O, were as follows: for kaolin A, 57.58%, 0.78%, 19.69%, 5.83%, 0.23%, 1.03%, 0.99% and 0.11%; for kaolin B, 56.30%, 0.80%, 21.30%, 7.19%, 0.08%, 0.52%, 1.19% and 0.16%; and for kaolin C, 68.03%, 0.80%, 14.40%, 5.08%, 0.32%, 0.94%, 0.95% and 0.01%. The two analysis results showed that the three kaolin samples had met the requirements as zeolite precursors based on the range of reference specification values: loss on ignitation<10%, SiO2 content 50–70%, TiO2 <1%, Al2O3 8.5–30.5%, Fe2O3 2–15.5%, CaO <1.68%, MgO 0.48–1.19%, K2O <3.6%, and Na2O <0.35%. The ensuing results furnish recommendations for the zeolite synthesis practicum, to select the most suitable kaolin type.
Optimization of Extraction and Measurement Methods in the Determination of Total Iron (Fe) Content in Anti-Anemia Multivitamin Capsule Samples Ismail, Rohmat; Erlangga, Manasye; Wahyuningtyas, Irma; Prihatini, Esti
Jurnal Beta Kimia Vol 5 No 1 (2025): Volume 5 Number 1, May 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i1.21161

Abstract

Iron (Fe) is a transition metal that plays a critical role in human life, particularly as a micronutrient. The objective of this study is to optimize and ascertain the most appropriate method for measuring the total Fe content of anti-anemia multivitamin capsule samples, thereby ensuring the accuracy of the measurement results. The determination of total Fe content can be achieved through two metal extraction methods, namely wet digest and dry ashing methods, and two metal measurement methods, namely UV-Vis spectrophotometer and atomic absorption spectrophotometer (AAS). The findings revealed that the measurement of total Fe content by UV-Vis spectrophotometer through the dry ashing extraction method yielded a lower value (20.92 ± 0.29 mg/g) compared to the wet digest method (67.91 ± 0.83 mg/g). Furthermore, the Fe content determined by AAS analysis exhibited a reduced value in the dry ashing extraction method (1.42 ± 0.02 mg/g), while the wet digest extraction method yielded a substantially higher value (72.91 ± 4.12 mg/g). Statistical tests with the Duncan method revealed that the wet digest extraction method with UV-Vis spectrophotometer measurements is the most effective method for determining the total Fe content, with a significance level equivalent to the theoretical reference value (67.85 ± 0.03 mg/g).
PENGUJIAN PERFORMA ALAT SPECTRONIC 20D+ DENGAN LARUTAN KALIUM PERMANGANAT (KMNO4) Ismail, Rohmat; Wahyuningtyas, Irma; Erlangga, Manasye; Prihatini, Esti
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.5992

Abstract

The Spectronic 20D+ is a simple spectophotometer that is still widely used in laboratories for both research and practicum activities. In order to ensure the continued accuracy of measurements, it is imperative that this instrument undergoes rigorous testing to ascertain its performance. The selection of potassium permanganate (KMnO4) as the testing solution is particularly salient in this context, given its notable advantages over conventional alternatives such as cobalt (II) chloride and potassium dichromate. These alternatives, while widely employed, are associated with a higher degree of risk and cost. The objective of this study is to ascertain the performance of the Spectronic 20D+ device when utilized with a KMnO4 solution. In this study, two units of Spectronic 20D+ were utilized, with one unit receiving a filter cleaning treatment only (PF), and the other undergoing a filter cleaning and replacement of the wolfram lamp (PFL). The maximum wavelength test yielded a value of 515 nanometers on both devices prior to the initiation of the repair process. The results of measuring the standard solution show that there is an increase in the amount of light absorbed, the slope of the line, and the coefficient of determination (R²). These were statistically tested with significantly different results on both tools after the repair process. This finding indicates that the measurement outcomes of the KMnO4 solution can serve as a reliable metric for evaluating the performance of the device before and after the repair process. Furthermore, following the restoration of the tool, the optimal linear range for KMnO4 concentration measurement was ascertained, ranging from 0 to 25 ppm. This determination was informed by the highest R2 value and the outcomes of cuvette correction testing, which yielded a consistent molar permissivity significance value as determined by the Duncan test for the five cuvettes utilized in this study.
Co-Authors Afiah, Givana Indah Nurul Himawan, Ari Ismail, Rohmat Prihatini, Esti Wahyuningtyas, Irma