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Rusmini
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Education Mathematics

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PENGGUNAAN METODE PRAKTIKUM DAN PRESENTASI HASIL PRAKTIKUM PADA MATA KULIAH ANALISIS BAHAN PANGAN DI JURUSAN KIMIA FMIPA UNESA Titik Taufikurohmah, ; Rusmini, ; Maria Monica Sbw,
Jurnal Penelitian Pendidikan Matematika dan Sains Vol 15, No 1 (2008)
Publisher : Jurnal Penelitian Pendidikan Matematika dan Sains

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Abstract

Telah dilakukan penelitian tentang penggunaan metode praktikum dan presentasi hasil praktikum pada mata kuliah analisis bahan pangan. Penggunaan metode ini diharapkan mampu meningkatkan pemahaman mahasiswa tentang materi perkuliahan analisis bahan pangan. Hasil penelitian menunjukkan bahwa 97% aktivitas mahasiswa digunakan untuk kegiatan yang menunjang pembelajaran dan 3% untuk aktivitas yang kurang relevan. Hasil tes belajar diperoleh 100% mahasiswa tuntas belajar. 97,5% mahasiswa merasa menarik dengan metode ini dan 2,5% tidak tertarik. Pembelajaran dengan metode ini menjadikan perkuliahan berpusat pada mahasiswa dan tidak berpusat pada dosen.
PENGARUH ION Cr (VI) TERHADAP FOTODEGRADASI One Hartawati, ; Rusmini,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

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Study about effect of Cr (IV) ion concentration to methylene blue photodegradation catalyzed by TiO2 had been done. Photodegradation process was conducted at closed reactor radiated by UV lamp with type B 40 Watt using bath system. The suspency consisting of methylene blue solution, TiO2 powder, and K2Cr2O7 solution were radiated by UV lamp a long with stirring for certain time. Undegradated methylene blue concentration was measured using UV-Vis spectrophotometer, while effect of Cr (VI) ion was determined with comparing differentiated between initial and residual methylene blue concentration. The result of research showed that increasing of ratio of Cr (IV) ion concentration was decreased the degradation of methylene blue concentration. The higher methylene blue photodegradaton (59,660%) was obtained at methylene blue concentration of 10 mg/L, 50 mg of TiO­2 in 50 mL solution, neutral pH, and radiation for 1 hour.2 had been done. Photodegradation process was conducted at closed reactor radiated by UV lamp with type B 40 Watt using bath system. The suspency consisting of methylene blue solution, TiO2 powder, and K2Cr2O7 solution were radiated by UV lamp a long with stirring for certain time. Undegradated methylene blue concentration was measured using UV-Vis spectrophotometer, while effect of Cr (VI) ion was determined with comparing differentiated between initial and residual methylene blue concentration. The result of research showed that increasing of ratio of Cr (IV) ion concentration was decreased the degradation of methylene blue concentration. The higher methylene blue photodegradaton (59,660%) was obtained at methylene blue concentration of 10 mg/L, 50 mg of TiO­2 in 50 mL solution, neutral pH, and radiation for 1 hour.
Co-Authors Maria Monica Sbw One Hartawati Titik Taufikurohmah