Published: December 31, 2025

The Effect of Hydrofluoric Acid Treatment on SiO₂ and Al₂O₃ Content in Red Mud to Increase Fe₂O₃ Levels

Sayyidatun Nafisah (1), Arif Hidayat (2), Deni Shidqi Khaerudini (3)
(1) Program Studi Magister Teknik Kimia, Universitas Islam Indonesia, Yogyakarta, Indonesia ,
(2) Program Studi Magister Teknik Kimia, Universitas Islam Indonesia, Yogyakarta, Indonesia ,
(3) Pusat Riset Material Maju, Badan Riset dan Inovasi Nasional (BRIN), Tangerang Selatan, Indonesia
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Determination of Organic Carbon Levels in Soil Samples Using Walkley & Black Method

Asma’ul Khusnah (1), Niken Pawestri (2), Maisari Utami (3)
(1) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia ,
(2) Balai Penerapan Standar Instrumen Pertanian (BPSIP) Yogyakarta, Yogyakarta 55584, Indonesia ,
(3) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia
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Determination of Available Phosphorus in Soil Samples Using Olsen & Bray I Method

Azzahra Nur Kholifah (1), Niken Pawestri (2), Maisari Utami (3)
(1) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia ,
(2) Balai Penerapan Standar Instrumen Pertanian (BPSIP) Yogyakarta, Yogyakarta 55584, Indonesia ,
(3) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia
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Formulation of Sunscreen Cosmetic Lip Balm with Combination of Chitosan and Red Dragon Fruit Peel Extracts (Hylocereus polyrhizus)

Salmahaminati (1), Herdita Dyah Nuraini (2), Febi Indah Fajarwati (3)
(1) Prodi Kimia, Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Islam Indonesia, Jl. Kaliurang km. 14,5, Yogyakarta 55584, Indonesia ,
(2) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia ,
(3) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia
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Formulation of Sunscreen Body Lotion with A Combination of Chitosan and White Turmeric (Curcuma zedoaria Rosc.)

Salmah Aminati (1), Regita Putri Arini (2), Herdita Dyah Nuraini (3), Febi Indah Fajarwati (4)
(1) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia ,
(2) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia ,
(3) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia ,
(4) Program Studi Kimia, Jurusan Kimia, Fakultas MIPA, Universitas Islam Indonesia Jl. Kaliurang KM.14,5, Yogyakarta 55584, Indonesia
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