Judul: Pembuatan dan pencirian elektrode selektif ion Lu3+ (Lutetium) dengan Ionofor 4- odekanadioilbis-(1-fenil-3-metil-5-pirazolon)
Abstrak: The ion selective electrode (ISE) performance is affected by the type of ionophore used. This research developed an Lu3+ ISE with dodecanedioylbis-(1- phenyl-3-methyl-5-pirazolone) (H2DdBP) as ionophore which has been proved selective in Lu3+ liquid-liquid extraction. The best composition of ISE obtained from this research was 33% PVC, 57% acetophenone, 5% H2DdBP, and 5% oleic acid. Linear measurement was obtained with Nernst factor of 16.57 mV/decade at 10-3−10-7 M concentration range in very acidic situation and response time was 15 to 250 seconds. ISE still could be used at pH 4 and 7, with 5% Nernst factor decrease after 30 days usage. Other ions such as Cu2+, Cd2+, Pb2+, Ni2+, Ca2+, and La3+ did not affect the measurement of ISE.
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Judul: Pengoptimuman waktu penyalutan membran PVC dalam pembuatan elektrode selektif ion nitrat
Abstrak: Highly concentration of nitrate in environment especially in water can cause health issue. Therefore, nitrate level should be monitored periodically. The presence of nitrate in the water could be detected by ion-selective electrode (ISE) made of coated a wire electrode using polymeric membrane. The objectives of this research are to determine the optimum time of membrane coating and analytical performance of the ISE. The membranes used in this study were composed of, 35% PVC, 61% plasticizer, and 4% aliquot of 336-nitrate with various coating time of 10, 15, 20, 25, and 30 seconds. Based on the results, the optimum time of membrane coating was 20 seconds. ISE III showed the best Nernst factor of 59.70 mV/decade. The best Nernstian response was in concentration range of 10-4–10-1 M. The response time of the developed nitrate ISE was less than 1 minute. The detection limit was found to be 6.14  10-5 M. The developed nitrate ISE did not show interference by NO2 - ion, but encountered interference by the presence of CH3COO-, ClO4 -, H2PO4 -, and SO4 2- ions
Keyword: Bogor Agricultural University (IPB), PVC membrane, nitrate, ion selective electrode

Judul: Perubahan Penutupan Lahan Dan Faktor Penyebabnya Di Cagar Alam Gunung Papandayan, Provinsi Jawa Barat
Abstrak: Gunung Papandayan telah ditetapkan sebagai Taman Wisata Alam (TWA) yang semula bagian dari Cagar Alam (CA). Gunung ini telah meletus tahun 2002, yang mengakibatkan perubahan struktur vegetasi. Selain ini dinamika perubahan penutupan lahan juga sangat dipengaruhi aktivitas masyarakat di sekitar kawasan. Teknologi penginderaan jauh dan Sistim Informasi Geografi (SIG) dapat digunakan untuk pemantauan dan identifikasi perubahan secara reguler. Penelitian ini bertujuan untuk mengetahui perubahan penutupan lahan dan faktor penyebabnya pada periode tahun 1990, 2002 dan 2013. Hasil analisis menunjukkan bahwa jenis tutupan lahan yang mengalami perubahan tertinggi pada tahun 1990–2002 adalah hutan pegunungan menjadi semak belukar seluas 1019.29 ha. Adapun perubahan tutupan lahan terbesar yang terjadi pada tahun 2002-2013, yaitu semak belukar menjadi hutan pegunungan seluas 793.07 ha. Fakta tersebut mengindikasikan bahwa kerusakan yang pernah terjadi pada tahun 2002, sebagian telah bersuksesi menjadi hutan kembali.
Keyword: Cagar alam Gunung Papandayan, perambahan hutan, perubahan penutupan lahan