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All Journal Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Journal of Smart Agriculture and Environmental Technology
Febriani, Elsa
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Environmental Science Veterinary

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The stingless bee species Trigona spp. on various species of flowering plants in Baturaja City, Ogan Komering Ulu District, South Sumatra Febriani, Elsa; Pujiastuti, Yulia
Journal of Smart Agriculture and Environmental Technology Vol. 1 No. 1 (2023): April 2023: First issued, published, 2023-04-26
Publisher : Indonesian Soil Science Society of South Sumatra in Collaboration With Soil Science Department, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60105/josaet.2023.1.1.7-13

Abstract

Trigona bee (Trigona spp.) is a species of honey-producing bee that does not have a sting (Stingless bees). This bee is small in size and plays an important role as a pollinator of flowering plants. Research was conducted from June to July 2021 in Baturaja City, Ogan Komering Ulu Regency, South Sumatra. The purpose of this research was to study the species of Trigona bees (Trigona spp.) visiting various flowering plants and the species of flowering plants visited by these bees. The research method involved purposive sampling and direct observation in the field. Observations were made by identifying bee species present on several flower plants. Trigona bees predominantly used plants in the flowering phase as a food source due to their abundant nectar and pollen production. The field observations revealed 11 species of flowering plants favored by Trigona bees, namely Kembang kertas (Zinnia elegans), Jambu air (Syzygium aqueum), Air mata pengantin (Antigonon leptopus), Kelengkeng (Dimocarpus longan), Melinjo (Gnetum gnemon), Cabai (Capsicum annuum), Seri (Muntingia calabura), Palem (Dypsis lutescens), Matahari (Helianthus annuus), Santos lemon (Xanthostemon chrysanthus), and Belimbing (Averrhoa carambola). The most commonly found species of Trigona spp. was Heterogona itama, observed on the bridal tears flower (Antigonon leptopus).
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 Eti Rohaeti Fendy Gunawan, Fransisca Irmanida Batubara Sri Sugiarti YULIA PUJIASTUTI