Judul: Adsorptivitas arang aktif kayu meranti merah (Shorea sp) terhadap fenol.
Abstrak: Powder or scrap from wood processing has been widely used as adsorbent.This research utilized red meranti wood as an adsorbent for phenol waste. Activation process was carried out with combination of physical and chemical methods. The best condition was obtained with 0.75% NaOH and steam flow for 50 minutes. The adsorption capacity was 7.7−23.6 g/g and the adsorption efficiency was 89−92%. The adsorption mechanism followed Freundlich isotherm with linearity of 99.24%. The quality of the activated carbon was fulfiled the requirement in Indonesia National Standard 06-3730-1995 and was better than comercial activated carbon.
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Judul: Pembuatan, pencirian, dan uji daya adsorpsi arang aktif dari kayu meranti merah (Shorea Sp.)
Abstrak: Wood of red meranti (Shorea sp.) is utilized widely as furniture and construction material and produces plenty of wood waste. In this research, the wood waste was used as activated charcoal raw material to improve its utility. The activated charcoal produced was tested as absorbent in industrial chromium and manganese metal waste processing. Carbon activation was relied on 3 factors, namely activator chemicals, water vapour steam, and activation time. As the quality indicators of activated carbon Indonesian National Standard (SNI 06- 3730-1995) was used. The specific surface area and structure pattern of activated carbon were also determined. Commercial activated carbon was also studied as reference. The results showed that the best activated carbon based on iodine adsorption activity and SNI’s standard quality was carbon activated with water vapour steam for 90 minutes without activator chemicals (HCl 5%). The best activated carbon was capable to reduce chromium and manganese concentration up to 58.11 and 5.85%, respectively. The adsorption mechanism followed Freundlich isotherm, and the dosage obtained from the isotherm equation could reduce 99.99% of chromium concentration from industrial waste.
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Judul: Beberapa aspek anatomi alat sirkulasi ruang dada kancil
Abstrak: Telah dilakukan penelitian dengan menggunakan 10 ekor kancil dewasa jantan dan betina dengan tujuan untuk menge- tahui beberapa aspek anatomi alat sirkulasi di dalam ruang dada, meliputi jantung, pembuluh darah yang keluar dan ma- suk jantung serta ukuran-ukuran jantung. Kancil merupakan ruminansia terkecil di dunia, hidup di daerah tropika India, Thailand, Malaysia dan Indonesia bagian barat. Hewan ini dilindungi dan mempunyai prospek yang baik untuk hewan penelitian maupun dibudidayakan. Hasil penelitian menunjukkan bahwa berat jantung rаta-rata adalah 0.69% dari berat rata-rata kancil. Dan ini mirip pada jantung kuda dan anjing. Bentuk jantung lonjong seperti halnya ruminansia. Demikian pula letaknya di dalam ruang dada seperti pada ruminansia dengan adanya Ligamentum sternopericardiacum. Di dalam ventrikel kanan membersit sebuah Musculus (M.) papillaris dari dindingnya dan tiga sampai empat Musculi (Mm.) papillares dari Septum interventriculare. Hanya dua buah Mm. papillares yang berukuran besar dibersitkan dari dinding ventrikel kiri. Percabangan Arteri (A.) coronaria sinistra lebih dominan dari pada A. coronaria dextra. Sedangkan A. sub clavia sinistra dicabangkan langsung dari aorta di dorso- caudal pembersitan Truncus (Tr.) brachiocephalicus…
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