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All Journal Jurnal Pemberdayaan Masyarakat Indonesia (JPMI) Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.)
Gunawan, Fransisca
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Humanities Chemistry Decision Sciences, Operations Research & Management Education Social Sciences

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Kegiatan Pengembangan Usaha Terhadap Usaha Es Noni di Desa Cijedil Halim, Andrika Prakasa; Gunawan, Fransisca; Adirga, Giandre; Larisa, Gracia Tania; Christella, Jessy; Immanuel, Matthew; Rizky, Muhamad Reza; Gunawan, Sandy
Journal Pemberdayaan Masyarakat Indonesia Vol 1 No 2 (2019): Jurnal Pemberdayaan Masyarakat Indonesia (JPMI)
Publisher : Pusat Pengabdian kepada Masyarakat (PPKM) Universitas Prasetiya Mulya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1007.136 KB) | DOI: 10.21632/jpmi.1.2.314-333

Abstract

Es Noni is a home-based ice cream business that is still being classified as a small business as it needs a better development process to increase its sales. Therefore, Es Noni has several problems formulated from this case that needs to be solved. First, the production quantity of the ice cream was limited due to the absence of, no suitable freezer to store all of the production demand. Next, there was only one place to sell the ice cream continuously and they didn’t have a large, compatible cooling box that has enough space to store all of the sellable ice creams. Whereas the last problem is Es Noni never records its sales on a daily basis and their way of distributing the revenue is still incorrect. With all of the problems that Es Noni had, the author wanted to help in solving these problems. The author purchased most of the required equipment to increase the amount of production and sales. Moreover, the author discovered other sales methods to expand the ice cream’s market, alongside giving them the knowledge on how to write an accounting report correctly regarding their cash flow and product inventory to minimize the occurrence of adverse errors.
Preparation and Field Application of A Cellulose Triacetate–Based Optode for Cr(VI) Detection in Environmental Water Samples Arif, Zulhan; Fendy; Gunawan, Fransisca; Febriani, Elsa; Sugiarti, Sri; Rohaeti, Eti; Batubara, Irmanida
Indonesian Journal of Chemical Studies Vol. 4 No. 2 (2025): Indones. J. Chem. Stud. December 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v4i2.147

Abstract

In this study, the optode was fabricated by incorporating 1,5-diphenylcarbazide and the ion carrier Aliquat 336 into a cellulose triacetate polymer matrix, which was subsequently modified using a dual-plasticizer system consisting of oleic acid and acetophenone. The successful synthesis of the optode was justified through FTIR spectroscopy to confirm functional group immobilization and screw micrometer measurements to ensure membrane thickness uniformity. A linear response was obtained within the concentration range of 0.02–0.40 ppm, with a determination coefficient (R²) of 0.9979, a limit of detection of 0.0108 ppm, a limit of quantitation of 0.0328 ppm, precision expressed as a relative standard deviation of 4.458%, and accuracy of 97.51%. The optode demonstrated high analytical sensitivity, as evidenced by a molar absorptivity of 2.262 × 10⁷ M⁻¹ cm⁻¹, along with excellent selectivity against common potentially interfering ions, including Fe(III), Pb(II), Zn(II), and Cd(II). The formed color complex exhibited good stability, remaining unchanged for up to five days. When applied to the determination of Cr(VI) in water samples, the optode yielded a concentration of 0.0664 ppm with satisfactory precision and accuracy. Although this value differed from the concentration obtained using UV–Vis spectrophotometry (0.0881 ppm), the overall performance of the optode was validated. Furthermore, a functional prototype was successfully developed and evaluated using real samples, producing favorable results. Collectively, these outcomes highlight the strong potential for further development and optimization of the proposed system.
Co-Authors Adirga, Giandre Christella, Jessy Eti Rohaeti Febriani, Elsa Fendy Halim, Andrika Prakasa Immanuel, Matthew Irmanida Batubara Larisa, Gracia Tania Rizky, Muhamad Reza Sandy Gunawan Sri Sugiarti