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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI SAINSMAT Jurnal Sains Materi Indonesia JURNAL TEKNOLOGI LINGKUNGAN Syntax Literate: Jurnal Ilmiah Indonesia Indonesian Journal of Chemistry Jurnal Ecolab Molekul: Jurnal Ilmiah Kimia Eruditio : Indonesia Journal of Food and Drug Safety Environmental and Materials Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Sains Materi Indonesia Sainsmat : Jurnal Ilmiah Ilmu Pengetahuan Alam
Asep Saefumillah
Departemen Kimia Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Indonesia
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Education Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Physics Public Health Social Sciences Other

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Lanthanum Metal-Organic Frameworks as Binding Agent in Diffusive Gradients in Thin Films (DGT) for Phosphate Monitoring: Influence of pH and Competing Anions Citra Santikasari; Asep Saefumillah; Agustino Zulys; Meyliana Wulandari
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 12, No. 1, May 2026
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v12i1.50201

Abstract

Phosphate mobility and bioavailability play critical roles in aquatic ecosystems, yet conventional monitoring methods are limited by sample disturbance and poor representation of in-situ conditions. The Diffusive Gradients in Thin Films (DGT) technique overcomes these limitations by enabling passive, in-situ measurement that accurately reflects natural solute diffusion and sediment resupply dynamics. This study introduces lanthanum metal-organic frameworks (La-MOF) as a novel selective binding agent in a DGT for in situ phosphate monitoring. La-MOF was synthesized via solvothermal using DMF (La-MOF 1) and mixed DMF/water (La-MOF 2), then characterized by XRD, FTIR, SEM-EDX, and BET analysis. Structural characterization confirmed successful framework formation for both materials. La-MOF 2 exhibited improved crystallinity, more homogeneous morphology, higher specific surface area (84.96 m2 g-1) and larger pore volume (0.090 cc g-1) compared to La-MOF 1. The selectivity performance of La-MOF DGT was evaluated across pH 2-11 and in the presence of competing anions (NO3-, SO42-, and CO32-). Optimal phosphate uptake occurred at pH 4-7, corresponding to the predominance of H2PO4- species. The inhibitory effect on phosphate uptake followed the order: NO3⁻ > CO3²⁻ > SO4²⁻. These findings demonstrate the potential applicability of La-MOF as a selective binding agent for DGT-based phosphate monitoring in aquatic environments.
Modifikasi Lapisan Difusi dengan Pengikat Silang N,N’Metilenbisakrilamida(MBA) pada Sistem DGT Berbasis Gel dengan Adsorben TiO2 untuk Penentuan Konsentrasi Fosfat di Lingkungan Akuatik Asep Saefumillah; Dhania Dwi Aprianti; Iman Abdullah; Inna Husna
SAINSMAT: Jurnal Ilmiah Ilmu Pengetahuan Alam Vol. 2 No. 2 (2013): Volume 2 Nomor 2 (September 2013)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Makassar

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Abstract

High phosphate concentrations in aquatic environments can cause algal bloom that canresult serious problem in aquatic ecosystems. As such, the determination techniques ofphosphate which reflect its bioavailability need to be available in order to know the levelof phosphate concentration in aquatic ecosystem. One of effective method that is currentlyused in the determination of phosphate bioavailability in aquatic environments is aDiffusive Gradient in Thin Films (DGT) technique with TiO2 as a binding layer. In thisresearch, the crosslinking modification of polyacrylamide gel was used as a diffusive gelsin DGT system to improve the selectivity of the orthophosphate adsorption. Thecrosslinker that used for modification is N, N'-methylenebisacrylamide (MBA). Diffusioncoefficient with concentration of crosslinking degree of variation was found that thediffusion coefficient is inversely proportional to the concentration of cross linker. Test ofselectivity DGT diffusive gels with crosslinking MBA done through the calculation of totalphosphate levels in both systems with a competing organic phosphorus compound in theform of phytic acid anions and humic acids. The calculation is done using the systemdeployment within 24 hours and the concentration of crosslinking variation MBA (0,05%,0,2% and 0.3%). Obtained through these calculations show that the diffusive gelcrosslinking MBA with a concentration of 0.3% gave the best selectivity towardsorthophosphate anion. This has been proven through experimental research by usingorganic phosphate as competing species. Concentration of phytic acid and humic acidadsorbed on these systems tend to stagnate despite its concentration increases. This provesthat the diffusive gel MBA 0,3% have skipped a certain threshold in both the organic acids; was only of 28,753μg for phytic acid and 33,177 μg for humic acid. Based on this study itcan be concluded that the degree can be used as a crosslinking on diffusive polyacrylamidegels in DGT system. The use of crosslinked diffusive material can also provide phosphatebioavailability concentration measurements that are more accurate because it is moreselective towards amount of orthophosphate and limting organic phosphate diffused asphytic acid and humic acid which can interfere with analysis of the levels oforthophosphate.
Validasi Metode Analisis Bahan Pembanding Sekunder Anhidrotetrasiklin Hasil Transformasi In Situ Tetrasiklin Hidroklorida dengan Asam Hidroklorida Fajar Kurniyati; Asep Saefumillah
SAINSMAT: Jurnal Ilmiah Ilmu Pengetahuan Alam Vol. 3 No. 1 (2014): Volume 3 Nomor 1 (Maret 2014)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Makassar

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Abstract

Parameter mutu dan keamanan obat seringkali dikaitkan dengan kandungan cemaran di dalamnya terutama terkait dengan cemaran yang bersifat racun atau karsinogenik. Dalam konteks pengawasan obat di Indonesia, analisis yang akurat dalam mendeteksi dan mengkuantisasi cemaran pada senyawa obat maupun produk obat perlu dilakukan. Namun demikian, ketersedian bahan pembanding cemaran yang merupakan salah satu faktor penentu jaminan mutu hasil pengujian laboratorium, seringkali menjadi kendala karena sukar diperoleh dan cukup mahal harganya. Penelitian ini dimaksudkan untuk membuat bahan pembanding sekunder cemaran secara in situ dengan cara mengubah senyawa aktifnya dalam hal ini anhidrotetrasiklin hidroklorida yang dibuat melalui transformasi tetrasiklin hidroklorida dengan asam hidroklorida. Analisis kualitatif pada penelitian ini dilakukan dengan menggunakan HPLC yang dilengkapi detektor dioda array, sementara analisis kuantitatifnya dilakukan menggunakan HPLC UV-vis pada panjang gelombang 280 nm. Anhidrotetrasiklin hasil transformasi diuji stabilitasnya dengan microwave dan paparan sinar matahari dan hasilnya menunjukkan bahwa senyawa yang terbentuk bukan produk intermediet. Semua parameter validasi metode seperti spesifisitas/selektivitas, rentang, linearitas, presisi dan akurasinya telah terpenuhi dengan nilai sangat baik. Uji homogenitas juga dilakukan dan tetrasiklin hidroklorida yang diuji dapat dinyatakan homogen dalam hal pembentukan anhidrotetrasiklin hidroklorida. Nilai yang ditetapkan terhadap baku pembanding primer anhydrotetracycline hydrochloride EPRS adalah 102,05%, n=10, SD=0,64%, RSD=0,63% tanpa data outlier. Nilai estimasi ketidakpastian pengukuran diperluas yaitu 3,19%.
Co-Authors Agustiani, Tia Agustino Zulys Amalia Ekaputri Hidayat Ardhasena Sopaheluwakan Ardina Purnama Tirta Budiawan Budiawan Cahyana , Antonius Herry Citra Santikasari Dhania Dwi Aprianti Endang Saefudin Fajar Kurniyati Fajar Kurniyati Fajar Kurniyati, Fajar Fatah, Fadhlir R. A. A. Foliatini Foliatini Foliatini Foliatini Hafiizh Prasetia Hafiizh Prasetia, Hafiizh Haidar Sitie Rafidah Haidar Sitie Rafidah Hanies Ambarsari Hanna Shafira Helmiady Helmiady Heny Suseno Herawati Herawati Ikfa Nur Fadilla Iman Abdullah Indah Permatasari Inna Husna Isnaeni, Neni Janrizka Betta C. Elisunarko Kiki Adi Kurnia Mahadika, Bella Sukma Maimulyanti, Askal Meri Suhartini Meri Suhartini Meyliana Wulandari Mubarok, Hanif Muharam Syam Nugraha Pramadewandaru, Respati K. Putri, Mu'izzah Irsyadi Reza Mulyawan Ridla Bakri Rika Tri Yunarti Rosaria Nainggolan Saepurahman, Saepurahman Siti Zahara Sitorus, Rinaldo Wellia, Diana Vanda Yanwar Pratama Putra