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All Journal Journal of Degraded and Mining Lands Management Jurnal Geosains dan Teknologi
Razi, Faizal
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Energy Engineering Environmental Science

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Identification and distribution of fluoride in Singkep Island, Lingga Regency, Riau Islands Razi, Faizal; Hendrayana, Heru; Harijoko , Agung
Journal of Degraded and Mining Lands Management Vol. 11 No. 4 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.114.6185

Abstract

The consumption of fluoride below the safe limit can result in dental caries, while high concentrations can lead to fluorosis, which can potentially impair the body's systems. One geological factor that influences the concentration of fluoride in water is the type of rock through which the water passes, including granite and its weathering products. The area is located within the Tandjungbuku Formation, which is predominantly composed of granite rock and contains several areas with Mining Business Permits (IUP) for commodities such as silica sand. This research serves as a form of mitigation in response to mining activities, post-mining, and the development of an industrial area. One anticipated impact is an increase in fluoride concentration in the research area, originating from both natural geological processes and human activities. The investigation involved geological mapping, petrographic analysis, XRD, and XRF analysis. Water sampling was conducted for both surface water and groundwater from wells in Resang Tandjungbuku Village. The research area consists of two rock units: granite, which acts as a non-aquifer layer, and colluvial deposits, which function as a free aquifer. Petrographic analysis identified minerals associated with fluoride, such as plagioclase, amphibole, and biotite. This was supported by XRD analysis with the presence of biotite, muscovite and kaoline minerals. XRF results revealed fluoride values in granite rock at 0.23% or 2300 ppm, further confirming granite as a source of fluoride. Analysis of fluoride in surface water showed values ranging from 0.01 to 4.24 mg/L, while groundwater consistently had a value of 0.01 mg/L.
Analisis Potensi Pasir Kuarsa Sebagai Bahan Baku Semikonduktor Daerah Kecamatan Dusun Selatan dan Dusun Utara, Kabupaten Barito Selatan, Provinsi Kalimantan Tengah Arif, Subhan; Razi, Faizal; Fadhli, T. Muharrizal
Jurnal Geosains dan Teknologi Vol 8, No 1 (2025)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.8.1.2025.34-41

Abstract

Kebutuhan akan pasir silika berkualitas tinggi untuk berbagai aplikasi industri, terutama sebagai bahan baku semikonduktor membutuhkan eksplorasi komoditi ini perlu ditingkatkan. Penelitian ini bertujuan untuk mengetahui geometri dan persebaran batupasir kuarsa serta kualitas pasir kuarsa di lokasi penelitian sebagai bahan baku semikonduktor. Metode yang digunakan adalah analisis geokimia X-ray fluorescence (XRF) untuk mengukur komposisi masing-masing sampel. Karakter pasir kuarsa berupa endapan dengan ukuran butir membundar tanggung, sortasi baik. Hasil analisis menunjukkan bahwa Sampel 1 dan Sampel 3 memiliki kandungan SiO2 yang tinggi (di atas 99%), namun masih mengandung pengotor di atas batas yang ditetapkan untuk bahan semikonduktor. Sampel 2 memiliki kandungan SiO2 terendah (92,17%) dan pengotor tertinggi. Analisis korelasi Pearson menunjukkan hubungan negatif yang kuat antara SiO₂ dengan pengotor, terutama Al2O3 dan TiO2. Disimpulkan bahwa ketiga sampel pasir silika tidak memenuhi standar kemurnian untuk bahan baku semikonduktor tanpa proses pemurnian lebih lanjut.
Co-Authors Agung Harijoko Fadhli, T. Muharrizal Heru Hendrayana Subhan Arif, Subhan