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All Journal KOVALEN: Jurnal Riset Kimia Indonesia Chimica Acta Jurnal Riset Sains dan Kimia Terapan Jurnal Pengabdian UNDIKMA Jurnal Akademika Kimia Jurnal Akademika Kimia
Khairuddin Khairuddin
Analytical Chemistry, Chemistry Department, Tadulako University
Religion Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Nursing Public Health Social Sciences Other

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Analisis Kadar Kadmium (Cd) dalam Bawang Merah Lokal Palu (Allium cepa L. var. aggregatum) pada Berbagai Lokasi dan Umur Tanam: Analysis of Cadmium (Cd) in Palu Local Shallots (Allium cepa L. var. aggregatum) at Various Locations and Planting Ages Eka Lindawati; Khairuddin Khairuddin; Nurhaeni; Ruslan; Ahmad Ridhay; Husain Sosidi; Erwin Abdul Rahim; Syamsuddin
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 1 (2023): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i1.16287

Abstract

The local Palu shallot (Allium cepa L. var. aggregatum) plant is one of the leading products in the Central Sulawesi region. Shallots can experience a decrease in quality if they are contaminated with heavy metals, such as cadmium (Cd) in amounts that exceed the threshold. This study aims to determine the effect of planting age on cadmium levels in local Palu shallots cultivated in Oloboju Village and Solove Village, Biromaru District, Sigi Regency. The research variables used were the planting age which consisted of 4 levels (age 40, 50, 60, and 70 days), and the planting location which consisted of 2 levels (Solove Village and Oloboju Village). Cd levels were analyzed using an Atomic Absorption Spectrophotometer (AAS). Cadmium levels in shallot roots at two planting locations decreased with increasing planting age, from 101.34 - 107.18 mg/kg at 40 days of age to 1.68-3.78 mg/kg at 70 days of age. Shallot bulbs at two locations had lower cadmium levels than roots, namely 0.01-0.04 mg/kg. The results of the study found that planting time had a significant effect on cadmium levels in the roots of shallots, but planting age and planting location had no significant effect on cadmium levels in local Palu shallot bulbs with levels that met the SNI (Indonesian national standard) quality requirements
Softening Hard Water using Cocoa Shell Activated Charcoal Nurhayati Nurhayati; Ahmil Ahmil; Khairuddin Khairuddin; Tri Handayani; Ahmad Fauzan Tambuak
Jurnal Akademika Kimia Vol. 10 No. 2 (2021)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2021.v10.i2.pp119-125

Abstract

Cocoa pod shells contain 23-54 % cellulose, 1.14 % hemicellulose, and 20-27.95 % lignin. The high cellulose content in the cocoa pod shell has the potential to be further processed into adsorbents. Before being used as an adsorbent, activation using HCl solution was carried out to increase the adsorption power of the cocoa shell. This research was conducted to analyze the influence of adsorbent dose, pH solution, the efficiency of hard water reduction, and adsorption capacity on Ca2+ and Mg2+ ions. Adsorption of hard water ions was conducted by varying adsorbent doses of 1, 3, 5, 7, and 9 g and varying at the pH of 5, 6, 7, 8, and 9. Optimum condition achieved at the mass of 5 g with Ca2+ and Mg2+ ions adsorption efficiency of 85.4 and 18.31%, respectively. Optimum condition achieved at the pH of 9 with Ca2+ and Mg2+ ions adsorption efficiency of 61.54 and 49.11%, respectively. The highest Ca2+ and Mg2+ ions adsorption capacity was obtained at the adsorbent mass of 1 g with adsorption capacity respectively 4.05 and 0.54 mg/g. The highest Ca2+ and Mg2+ ions adsorption capacity was obtained at a pH of 9 with an adsorption capacity of 4.05 and 0.54 mg/g, respectively.
Sintesis dan Karakterisasi Polivinil Alkohol (PVA) Terlapis Polieugenol: Synthesis And Characterization of Polyvinyl Alcohol (PVA) Coated with Polyeugenol Rahim, Erwin Abdul; Ridhay, Ahmad; Sitti Nur Halizah; Indriani; Sosidi, Husain; Khairuddin; Inda, Nov Irmawati; Nurakhirawati; Mirzan, Moh.; Amar, Aini Auliana
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 1 (2024): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2024.v10.i1.17088

Abstract

A study has been conducted on materials containing polyvinyl alcohol (PVA) coated with poly eugenol. This research aims to explore the synthesis process and properties of PVA coated with poly eugenol. Characterization of PVA includes tensile strength measurement and surface observation using SEM. Additionally, the antioxidant activity of PVA was also tested using the DPPH method. In this study, PVA films were obtained by dissolving PVA in a water solvent. The characterization results indicate that the tensile strength ranges from 25.56 to 271.10 Mpa, elongation reaches 315.20 to 320%, and the young modulus ranges from 4.05 to 6.27 Mpa. Surface observation with SEM shows a smooth surface without pores. The antioxidant activity test shows IC50 values ranging from 84.11 to 175.37 ppm.
Spesiasi dan Bioavailabilitas Merkuri dalam Sedimen Teluk Palu Pasca Gempa dan Tsunami dengan Metode Diffusive Gradient in Thin Film (DGT): Speciation and Bioavailability of Mercury in Palu Bay Sediments Post Earthquake and Tsunami Using the Diffusive Gradient in Thin Film (DGT) Method Sosidi, Husain; Khairuddin; Dwiyana, Putri; Ruslan, Ruslan
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 2 (2024): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2024.v10.i2.17264

Abstract

Speciation and bioavailability of mercury in the sediments of Palu Bay after the earthquake and tsunami were conducted using fractionation and Diffusion Gradient in Thin Films (DGT). This method has been conducted using sediment samples from the estuary of the Pondo River, Palu. Heavy metal speciation of mercury ions was conducted by looking at the distribution of mercury ions in various species by sequential extraction and heavy metal bioavailability of mercury ions. This method was conducted by looking at the migration of mercury ions from sediments into the seawaters using a Diffusive Gradient in Thin Films (DGT). The speciation of mercury ions concentration with sequential extraction as EFLE (easily, freely, leachable, exchangeable) fraction is about < 0.0005 ppm, the oxidizable fraction is about < 0.0005 ppm and the resistant fraction is between < 0.0005 ppm to 0.0063 ppm. The results of DGT experiments to study the migration of mercury ions from sediments into the seawaters during 3 days of immersion is between 0.01003 ppm and 0.01748 ppm. The availability of mercury ions concentration in the sediments allows for the migration of mercury ions into water.
Studi Variasi Suhu dan Kosentrasi Larutan Asam Sitrat terhadap Karakteristik Silika Daun Tebu menggunakan Metode Leaching Abustiana, Rahma Lolita; Mirzan, Muhamad; Sosidi, Husain; Khairuddin; Ridhay, Ahmad; Jusman
Jurnal Riset Sains dan Kimia Terapan Vol. 11 No. 1 (2025): Jurnal Riset Sains dan Kimia Terapan, Volume 11 Nomor 1, Juni 2025
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRSKT.111.04

Abstract

Telah dilakukan penelitian tentang studi variasi suhu dan konsentrasi larutan asam sitrat terhadap karakteristik silika daun tebu menggunakan metode leaching dengan 3 variasi suhu 60ºC, 80ºC, 100ºC dan 3 variasi konsentrasi 8%, 10%, 12%. Metode yang dilakukan ialah preparasi daun tebu, sintesis silika daun tebu menggunakan metode leaching dengan asam sitrat, dan pembakaran daun tebu hasil leaching asam sitrat. Pengujian dilakukan untuk memperoleh silika murni. Tujuan dari penelitian ini adalah untuk mengetahui variasi suhu dan konsentrasi larutan asam sitrat terhadap karakteristik silika daun tebu yang diperoleh dengan metode leaching. Hasil penelitian diperoleh 3 analisis yaitu, untuk analisis XRD menunjukan didapatnya hasil struktur silika yang masih amorf. Analisis FTIR menunjukan gugus fungsi yang terbentuk yaitu -OH, Si-O-Si dan Si-O. Analisis SEM menunjukan bahwa semakin tinggi suhu leaching yang diberikan terhadap sampel maka ukuran butir semakin merata.
Speciation and Bioavailability of Heavy Metals Pb and Cd in Palu Bay Sediments after the Earthquake and Tsunami Sosidi, Husain; Khairuddin; Ruslan; Abustiana, Rahma Lolita; Ramli, Aksar; Rahim, Erwin Abdul
KOVALEN: Jurnal Riset Kimia Vol. 11 No. 1 (2025): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2025.v11.i1.17671

Abstract

Major disturbances to seafloor morphology and input of terrestrial material due to the earthquake- tsunami in Palu City in 2018 have the potential to alter the chemical form (speciation), bioavailability, and flux of lead (Pb) and cadmium (Cd) in Palu Bay sediments. This study was conducted to analyze the speciation of Cd2+ ions and Pb2+ ions and determine the concentration of elusion ions using Diffusive Gradient in Thin Film (DGT). In this study, two methods were carried out, namely the fractionation method and the DGT method. The results showed that the analysis of ion speciation at 3 locations using the fractionation method obtained the highest concentration of Cd2+ ions of 1.4492 mg/L at location 1 and the highest concentration of Pb2+ ions of 0.0200 mg/L at location 3. The results of ion analysis at 3 locations using the DGT method obtained the highest elution yield concentration of Cd2+ ions of 0.0225 mg/L at location 1 and the highest elution yield concentration of Pb2+ ions of 0.0155 mg/L at location 3. This study shows that the presence of heavy metals Pb and Cd in Palu Bay sediments after the earthquake-tsunami is still detected with varying concentrations between locations. The fractionation method is able to describe the distribution of metal speciation in sediments, while the DGT method provides information on labile fractions that are more relevant to bioavailability. The combination of these two methods is important for understanding the potential risk of heavy metals to Palu Bay aquatic ecosystems and can be used as a basis for post-disaster environmental monitoring and management efforts.
Pengolahan Sampah Organik dari Limbah Rumah Tangga Menjadi Produk Eco-Enzyme di Desa Dalaka Kabupaten Donggala Ruslan Ruslan; Khairuddin Khairuddin; Jaya Hardi
Jurnal Pengabdian UNDIKMA Vol. 4 No. 2 (2023): May
Publisher : LPPM Universitas Pendidikan Mandalika (UNDIKMA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/jpu.v4i2.7039

Abstract

This community service activity aims to increase the knowledge and skills of housewives in Dalaka Village by processing organic waste from household waste into eco-enzyme products. This service was implemented through counseling and training in making fermenters and making eco-enzymes with simple and inexpensive methods. The production of eco-enzymes was done using the ratio of 3kg of organic waste, 1 kg of brown sugar, and 10L of water. The instrument for evaluating this activity used a satisfaction questionnaire form and was analyzed descriptively. The results of this dedication showed that partners could understand well the technology introduced and apply it. The resulting eco-enzyme product had a brown color and a distinctive sour aroma. The average level of participant satisfaction was in the "satisfied" range. Utilization of organic waste from household
Co-Authors Abustiana, Rahma Lolita Ahmad Fauzan Ahmad Ridhay Ahmil Aini Auliana Amar Andi Tenri Ajeng Askhiatul Fitriah Betzy Eppang Dwi Juli Puspitasari Dwi Nurfahriani Dwiyana, Putri Eka Lindawati Erwin Abdul Rahim Frischa Sari Kencana Husain Sosidi Indriani Indriani Indriani Indriani Jaya Hardi Joy Noldy Baciang Jusman Jusman, Jusman Khairunnisa Khairunnisa Krisma Meylin Lasampa Laras mariance sulo Mirzan, Muhamad Moh. Mirzan Moh. Mirzan Muh.Ricky Arisandi M. Tahili Muqasyifah Ni Ketut Sumarni Nov Irmawati Inda Nurakhirawati Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhayati Nurhayati Prismawiryanti Prismawiryanti Ramli, Aksar Ruslan Ruslan Ruslan Ruslan Ruslan Sabaruddin Sabaruddin Sitti Nur Halizah Sriwulan Indriani Pea Sulfitri Suardi Sutomo Eka Putra Syaiful Bahri Syamsuddin Syamsuddin Tri Handayani Ulayya Kasio Wiranto Wengkau