http://repository.ipb.ac.id/handle/123456789/153666 Sat, 25 Apr 2026 00:25:51 GMT 2026-04-25T00:25:51Z http://repository.ipb.ac.id/handle/123456789/171522 Validasi Metode Penentuan Kadar Fe(II) Air Limbah Tambang Secara Spektrofotometri Serapan Atom Dermawan, Rafly Air banyak dimanfaatkan pada sektor pertambangan, menghasilkan limbah air tambang mengandung zat besi dengan konsentrasi berbahaya bagi linkungan. Penentuan kadar Fe(II) pada air limbah tambang di PT Bukit Asam menggunakan metode destruksi basah berbasis HNO3 65%, yaitu sebanyak 5 mL untuk setiap pengujian dengan potensi pencemaran lingkungan. Penelitian ini bertujuan memvalidasi metode modifikasi volume penggunaan HNO3 dari 5 mL menjadi 1 mL berdasarkan standar AOAC 2019. Parameter validasi meliputi linearitas, presisi, akurasi, Limit of Detection, Limit of Quantification, Robustness, dan Ruggedness. Hasil optimasi menunjukkan volume optimum HNO3 sebesar 1 mL. Validasi metode menunjukkan linearitas yang sangat baik (r2 = 0,9997), presisi (%RSD (5,01) = 15%), akurat (80% = %recovery (106,72) = 110%), Limit of Detection (0,1149 mg/L), robust (f hitung = f tabel), dan rugged (t hitung = t tabel), tetapi Limit of Quantification (0,3482 mg/L) melebihi konsentrasi analit (0,2125 mg/L). Oleh karena itu, metode dinyatakan tidak valid dan belum dapat diterapkan sebagai prosedur standar analisis zat besi dalam air limbah tambang.; Water was widely used in the mining sector, producing mine wastewater containing iron with concentrations that are dangerous for the environment. Determination of Fe(II) in mining wastewater at PT Bukit Asam used a wet destruction method based on 65% HNO3, namely 5 mL for each test which has the potential for environmental pollution. This study aimed to validate the method of modifying the volume of HNO3 used from 5 mL to 1 mL based on the 2019 AOAC standard. Validation parameters include linearity, precision, accuracy, Limit of Detection, Limit of Quantification, Robustness, and Ruggedness. The optimization results showed that the optimum volume of HNO3 was 1 mL. Method validation showed excellent linearity (r2 = 0.9997), precision (%RSD (5,01) = 15%), accurate (80% = %recovery (106,72) = 110%), Limit of Detection (0,1149 mg/L), robust (f calculated = f table), and rugged (t calculated = t table), however Limit of Quantification (0,3482 mg/L) exceeded analyte concentration (0,2125 mg/L). Therefore, the method was declared not valid and can’t be applied as a standard procedure for iron analysis in mine wastewater. Wed, 01 Jan 2025 00:00:00 GMT http://repository.ipb.ac.id/handle/123456789/171522 2025-01-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/171358 Sintesis Nanokomposit Limbah Nilon/ZnO Sebagai Bahan Baku Pembuatan Benang Nilon Amelia, Meyliana Pemanfaatan limbah nilon sebagai bahan baku alternatif mendukung circular economy dan pengembangan polimer berkelanjutan. Penelitian ini bertujuan untuk sintesis nanokomposit nilon/ZnO dari limbah nilon serta analisis sifat fisiko-kimia yang menentukan kualitas benang nilon. Metode pengukuran meliputi kadar amina, viskositas relatif, titik leleh, serta karakterisasi struktur dan morfologi melalui FTIR dan SEM. Kadar amina meningkat dari 78,050 mmol/kg (kontrol) menjadi 103,997 mmol/kg (0,5 g ZnO), sedangkan viskositas relatif tercatat 41,94 - 49,43 cSt. Titik leleh bergeser dari 261,50 °C (kontrol) menjadi 266,90 °C (1,5 g ZnO), menunjukkan peningkatan stabilitas termal. Spektrum FTIR memperlihatkan pita serapan khas Zn-O serta perubahan intensitas gugus amina yang menandakan interaksi ZnO dengan poliamida. Simpulan penelitian yaitu adanya perbedaan signifikan antarformulasi, sehingga penambahan ZnO berpengaruh nyata terhadap sifat kimia dan termal nanokomposit nilon; The utilization of nylon waste as an alternative raw material supported the concept of a circular economy and the development of sustainable polymers. This study aimed to synthesize nylon/ZnO nanocomposites from nylon waste and to analyze the physicochemical properties determining the quality of nylon yarn. Measurement methods included amine content, relative viscosity, melting point, and structural and morphological characterization using FTIR and SEM. The amine content increased from 78.050 mmol/kg (control) to 103.997 mmol/kg (0.5 g ZnO), while the relative viscosity ranged from 41.94 to 49.43 cSt. The melting point shifted from 261.50 °C (control) to 266.90 °C (1.5 g ZnO), indicating an improvement in thermal stability. The FTIR spectrum showed characteristic Zn-O absorption bands and changes in amine group intensity, confirming interactions between ZnO and polyamide chains. The study concluded that there were significant differences among formulations, indicating that ZnO addition had a notable effect on the chemical and thermal properties of the nylon nanocomposites. Wed, 01 Jan 2025 00:00:00 GMT http://repository.ipb.ac.id/handle/123456789/171358 2025-01-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/171356 Sintesis Nanokomposit Limbah Nilon/ZnO Sebagai Bahan Baku Pembuatan Benang Nilon Amelia, Meyliana Pemanfaatan limbah nilon sebagai bahan baku alternatif mendukung circular economy dan pengembangan polimer berkelanjutan. Penelitian ini bertujuan untuk sintesis nanokomposit nilon/ZnO dari limbah nilon serta analisis sifat fisiko-kimia yang menentukan kualitas benang nilon. Metode pengukuran meliputi kadar amina, viskositas relatif, titik leleh, serta karakterisasi struktur dan morfologi melalui FTIR dan SEM. Kadar amina meningkat dari 78,050 mmol/kg (kontrol) menjadi 103,997 mmol/kg (0,5 g ZnO), sedangkan viskositas relatif tercatat 41,94 - 49,43 cSt. Titik leleh bergeser dari 261,50 °C (kontrol) menjadi 266,90 °C (1,5 g ZnO), menunjukkan peningkatan stabilitas termal. Spektrum FTIR memperlihatkan pita serapan khas Zn-O serta perubahan intensitas gugus amina yang menandakan interaksi ZnO dengan poliamida. Simpulan penelitian yaitu adanya perbedaan signifikan antarformulasi, sehingga penambahan ZnO berpengaruh nyata terhadap sifat kimia dan termal nanokomposit nilon; The utilization of nylon waste as an alternative raw material supported the concept of a circular economy and the development of sustainable polymers. This study aimed to synthesize nylon/ZnO nanocomposites from nylon waste and to analyze the physicochemical properties determining the quality of nylon yarn. Measurement methods included amine content, relative viscosity, melting point, and structural and morphological characterization using FTIR and SEM. The amine content increased from 78.050 mmol/kg (control) to 103.997 mmol/kg (0.5 g ZnO), while the relative viscosity ranged from 41.94 to 49.43 cSt. The melting point shifted from 261.50 °C (control) to 266.90 °C (1.5 g ZnO), indicating an improvement in thermal stability. The FTIR spectrum showed characteristic Zn-O absorption bands and changes in amine group intensity, confirming interactions between ZnO and polyamide chains. The study concluded that there were significant differences among formulations, indicating that ZnO addition had a notable effect on the chemical and thermal properties of the nylon nanocomposites. Wed, 01 Jan 2025 00:00:00 GMT http://repository.ipb.ac.id/handle/123456789/171356 2025-01-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/171355 Analisis Lisin Tersedia pada Tepung Bulu Ayam secara Near Infrared Spectroscopy dan Ultra Performance Liquid Chromatography Muliawan, Sidiq Penelitian ini bertujuan mengevaluasi metode near infrared spectroscopy (NIRS) untuk penetapan lisin tersedia pada tepung bulu ayam di PT Charoen Pokphand Indonesia. Metode NIRS dibandingkan dengan ultra performance liquid chromatography (UPLC) sebagai referensi, dengan fokus pada optimasi preprocessing dan validasi model. Hasil standard normal variate dan detrend (1,4,4,1) menunjukkan performa terbaik dengan koefisien determinasi (R²) 0,9985, SEP 0,185, dan RMSEP 0,183. Hasil validasi eksternal mengonfirmasi akurasi model melalui kesesuaian tinggi antara nilai prediksi dan referensi 98,7% sampel berada dalam batas control line. Nilai least significant bit konsisten sebesar 0,54, menunjukkan presisi instrumen yang optimal. Penelitian ini membuktikan NIRS sebagai metode alternatif yang cepat, non-destruktif, dan memenuhi standar ISO 12099:2017 untuk analisis rutin, dengan potensi penghematan waktu dan biaya dibandingkan metode konvensional. Implikasi praktisnya mencakup peningkatan efisiensi kontrol kualitas pakan ternak berbasis limbah unggas.; This study aimed to evaluate the near infrared spectroscopy (NIRS) method for the determination of lisin tersedia in chicken feather meal at PT Charoen Pokphand Indonesia. The NIRS method was compared with ultra performance liquid chromatography (UPLC) as a reference, focusing on preprocessing optimization and model validation. Five variations of preprocessing were tested, the combination of standard normal variate and detrend (1,4,4,1) showed the best performance with a coefficient of determination (R²) of 0.9985, SEP 0.185, and RMSEP 0.183. External validation results confirmed the accuracy of the model through high agreement between predicted and reference values, with 98.7% of samples within the control line limits. Least significant bit value was consistently 0.54, indicating optimal instrument precision. This study proved NIRS as a fast, non-destructive, and ISO 12099:2017 compliant alternative method for routine analysis, with the potential for time and cost savings compared to conventional methods. Practical implications included increasing the efficiency of quality control of poultry waste-based animal feed. Wed, 01 Jan 2025 00:00:00 GMT http://repository.ipb.ac.id/handle/123456789/171355 2025-01-01T00:00:00Z