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All Journal Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Panrannuangku Jurnal Pengabdian Masyarakat Journal of Education Research Jurnal Akademika Kimia JIPI (Jurnal IPA dan Pembelajaran IPA) Jurnal Akademika Kimia
Yuli Nurmayanti
Universitas Tadulako
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemistry Education Engineering Environmental Science Health Professions Library & Information Science Mathematics Physics Public Health Social Sciences

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Analysis of Nitrogen and Potassium in Liquid Organic Fertilizer from Rice Washing and Mature Coconut Water Pinkan K. Bolang; Vanny M. A. Tiwow; Paulus H. Abram; Yuli Nurmayanti
Jurnal Akademika Kimia Vol. 14 No. 2 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i2.pp64-69

Abstract

Mature coconut and rice washing water contain nitrogen and potassium, which are helpful for plants. This study aims to determine the levels of nitrogen and potassium in liquid organic fertilizer from a mixture of mature coconut water and rice washing water. Nitrogen content was analyzed using the Kjeldahl method. Potassium levels were analyzed using a flame photometer. The results indicated that the best nitrogen and potassium levels were obtained in liquid organic fertilizer with a mixture ratio 50:50, namely N 1.26% and K 1.27%. The highest nitrogen content was obtained in liquid organic fertilizer (LOF) with a mixture ratio of 25:75, 1.40%, and the highest potassium content was obtained in liquid organic fertilizer with a mixture ratio of 50:50, 1.27%. When mixed, the increase in nitrogen and potassium levels was caused by the bacteria in the liquid organic fertilizer, which breaks down protein during digestion.
Utilization of Black Tea Dregs as an Adsorbent of Metal Fe in Water using UV-Vis Spectrophotometry sauli safitri; Sitti Aminah; Yuli Nurmayanti; Sitti Rahmawati; Tri Santoso
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp187-193

Abstract

Tea dregs are household organic waste materials that can be utilized as low-cost adsorbents for heavy metal removal. Previous studies mainly employed green tea dregs and focused on Cu(II) adsorption, while studies on Fe(III) adsorption using black tea dregs and their direct application to Fe-contaminated water remain limited. This study evaluates the adsorption performance of black tea dregs toward Fe(III) ions and their application in water samples. Batch adsorption experiments were conducted using FeCl₃ solutions at pH 4.8 to determine the optimum contact time (15–90 minutes) and initial concentration (100–300 ppm). Fe(III) concentrations were analyzed using UV–Vis spectrophotometry. The results demonstrated an optimal contact time of 60 min and an optimal concentration, achieving 99.26% adsorption efficiency. Adsorption followed the Langmuir isotherm model with a maximum capacity of 37.04 mg/g (R² = 0.998). Application to well water samples resulted in 83.74% Fe removal, confirming the potential of black tea dregs as adsorbents.
Co-Authors AA Sudharmawan, AA Abram, Hengky P. Afadil Agustin Tiwow Anang Wahid M.Diah Daud Karel Walanda Detris Poba Griffiths, Zoe Gustina Gustina H.Mailili, Wahyuni Hamzah, Abdul Irmawati Irmawati Istiqomah, Almia Meida E. Marpaung Mery Napitupulu Nakazawa, Koyomi Napitupulu*, Mery Paulus H. Abram Pinkan K. Bolang Poba, Detris Rahma, Sri Robert Tolly sauli safitri Siti Nuryanti Sitti Aminah Sitti Rahmawati Tiwow, Vanny M A Tri Santoso