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All Journal IAES International Journal of Robotics and Automation (IJRA) Jurnal Neutrino : jurnal fisika dan aplikasinya Jurnal Tadris Kimiya JIPF (Jurnal Ilmu Pendidikan Fisika) Momentum: Physics Education Journal PENDIPA Journal of Science Education BIOEDUSAINS: Jurnal Pendidikan Biologi dan Sains Jurnal Pendidikan Multikultural Indonesia Hydrogen: Jurnal Kependidikan Kimia International Journal of Research in Education (IJRE) Aktual : Jurnal Pengabdian Kepada Masyarakat
M. Lutfi Firdaus, M. Lutfi
University of Bengkulu
Religion Humanities Automotive Engineering Chemistry Computer Science & IT Education Electrical & Electronics Engineering Engineering Environmental Science Languange, Linguistic, Communication & Media Mathematics Physics Public Health Social Sciences Other

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Journal : PENDIPA Journal of Science Education

 1 
Optimasi Sintesis Ligan Diheksilditiofosfat (DHDTP) Menggunakan Response Surface Method (RSM) Hendrati, Diana; Mardhotillah, Yulia; Anggraeni, Anni; Firdaus, M. Lutfi; Wyantuti, Santhy
PendIPA Journal of Science Education Vol 6, No 1 (2022): November - February
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/pendipa.6.1.285-290

Abstract

Dihexyldithiophosphate (DHDTP) ligand is one of the homologues of dialkyldithiophosphate which is potentially better as an extractant in solvent extraction. The longer the chain in the dialkyldithophosphate compound, ability to dissolve into the organic phase is increasing compared to the shorter chain. The purpose of this study is to synthesize DHDTP ligands and find out the optimum reaction conditions to produce DHDTP ligands with optimal purity using the BoxBehnken (BBD) response surface method (RSM). DHDTP ligands are synthesized from P2S5 by reflux after addition of n-hexanol under a nitrogen gas environment. Ammonium carbonate is added to the reflux to pH 7, then evaporated to remove the solvent. The synthesized DHDTP ligand was then purified by column chromatography with a mobile phase methanol : aquadest (2.5% gradient). DHDTP ligands were examined for purity using a reverse phase HPLC with a mobile phase methanol: aquadest 3: 2. The purity of the best DHDTP synthesis results obtained was 87.34%. The DHDTP ligand formed was characterized to confirm the structure of its ligand compound by using a UV spectrophotometer in which the synthesis product showed maximum absorption at a wavelength of 212 nm and mass spectroscopy ES- with m / z 297.1687.
DESKRIPSI ANALISIS KEBUTUHAN MEDIA PEMBELAJARAN IPA KELAS VII MTsN 1 SELUMA Junaini, Junaini; Nursaadah, Euis; Firdaus, M. Lutfi
PendIPA Journal of Science Education Vol 8 No 2 (2024): June
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/pendipa.8.2.121-125

Abstract

The aim of this research was to analyze the needs of students in science learning at MTsN 1 Seluma, Bengkulu. The method used was a survey via questionnaire with 9 questions given to 30 class VII students. The survey results show that 100% of students have textbooks/handbooks, 100% have smartphones, 93% have difficulty studying material that only comes from books, so 100% of students look for other materials besides books from school to help understand the material. science via the internet, therefore 100% of students need interesting alternative learning media. In science learning, students agree that there is Android-based learning media for science material, especially environmental pollution material. Students want learning to be adapted to current developments and technology, interesting, interactive, and can be accessed anytime and anywhere via smartphone. Implementation of media in the form of Android-based applications can be an alternative to empower students' use of technology and to improve the quality of science learning.
The Use of Telang Flower Extract (Clitoria ternatea L.) as a Natural Universal pH Indicator coupled with Digital Image Colorimetry Esterlin; Nursaadah, Euis; Wardana, Rendy W.; Firdaus, M. Lutfi
PendIPA Journal of Science Education Vol 8 No 3 (2024): October
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/pendipa.8.3.480-487

Abstract

The acid base indicators commonly used by scientists are mostly synthetic indicators that are harmful for the environment.Moreover, chemists need various chemicals to detect broad pH ranges for acid and base samples solution.  The aim of this research was to create a natural universal pH indicator from telang flower (Clitoria ternatea L.) extract coupled with the digital image detection. The universal pH indicator is very important in education chemistry that broadly used for titration and other class room chemical experiments. This process of making a natural universal pH indicator integrated with digital images meets green chemistry criteria that use environmentally friendly materials and technology. The results show that color absorption data at pH 1-2 are purple, pH 3-5 are violet, pH 6-10 are blue, pH 11-12 are green and pH 13-14 are yellow. RGB intensity digital image data shows the intensity of the red color increases in the pH range 6-11, while the intensity of the green and blue colors tends to be stable. The proposed method was validated using a UV-Vis spectrophotometer and conventional pH meter that give the comparable results.
Pengembangan Sistem Digital Image Colorimetry (DIC) Untuk Pemantauan Polutan Nitrogen Di Perairan Mulia Ramadhani, Adella; Dono Wilopo, Mukti; Johan, Yar; Iresta Wardani, Firdha; Firdaus, M. Lutfi
PendIPA Journal of Science Education Vol 9 No 3 (2025): October
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/pendipa.9.3.794-800

Abstract

The presence of ammonia in waters needs to be monitored because of its toxic nature, especially in the form of free ammonia (NH₃). High concentrations of free ammonia can disrupt the balance of aquatic ecosystems, reduce dissolved oxygen levels, inhibit the growth of aquatic organisms, and even cause mass mortality in fish and other biota. The purpose of this study is to build the Digital Image Colorimetry system for detecting ammonia and assess the accuracy of the DIC method compared to the well-known established spectrophotometric method. Analysis from 5 locations of saline water, salinity and pH levels were still within normal limits, ranging from 33-34 ppt for salinity, while pH is 7.5-7.9. The ammonia content at the sampling point was still considered safe, in accordance with the quality standard (0.3 ppm). The results of ammonia concentration measurements using the DIC method and the spectrophotometric method show a neglegible level of difference and have an accuracy value above 90%. These findings indicate that DIC can be used as an alternative method for measuring ammonia, especially for rapid analysis in the field.
Co-Authors ACENG RUYANI Anggraini, Yestilia Anni Anggraeni, Anni Arsela Eko Listiono BHAKTI KARYADI Budiyanto Budiyanto Dewi , Deshinta Arrova Dewi, Ria Kemala Elsi Adelia Fitri Endang Widi Winarni Esterlin Fahima, Bima Fahmizal, Fahmizal Fauzan, Ahmad Al Firmanul Catur Wibowo Fitri April Yanti, Fitri April Geminastiti, Elis Anggun Hadi, Hanifa Rahma Hendrati, Diana Henny Johan Iresta Wardani, Firdha Iwan Setiawan Junaini, Junaini Lazfihma, Lazfihma Mardhotillah, Yulia Mayub, Afrizal Mukti Dono Wilopo Mulia Ramadhani, Adella Nursa'adah, Euis Nursaadah, Euis Putra, Syalendra Putri Anjarsari Ramadhan, M. Rizqi Renata, Maria Rotami, Ladya Santhy Wyantuti Suherman, Suherman Walid, Ahmad Wardana, Rendy W. Wardana, Rendy Wikrama Yar Johan, Yar Yunitasari Yunitasari, Yunitasari Zulkarnain Zulkarnain