Judul: Komunitas Serangga Indigenous pada Bunga Jantan Kelapa Sawit (Elaeis guineensis Jacq.) di Kebun PTPN VIII Cimulang Bogor.
Abstrak: Oil palm is the biggest source of natural oil in the world. Oil palm is monoecious plant, but the male and female flower of the plant located at a different cluster. This study addressed to study indigenous insect community on male flower at oil palm. The insect were observed by fixed sample method on May, June 2011, January, November, and December 2012. Relationship between environment factors and insect community were analyzed by Pearson’s correlation with Sigmaplot software version 10.0. From the observation we found 5 order and 10 genera, such as Apis, Odontomachus, Camponotus, Anoplolepis, Braconid, Scaptodrosophila, Curculionid, and Dermaptera (sp1, 2, and 3). Bee, Apis cerana visited male flower of oil palm and the species role in pollination. The other, we found predatory insects, such as, Odontomachus, Anoplolepis, and Dermaptera. Result showed that the most dominant insect was Scaptodrosophila sp. The insect population significantly affected by environmental temperature.
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Judul: Komunitas Semut Pada Bunga Jantan Kelapa Sawit di Kebun Cimulang PTPN VIII Bogor, Jawa Barat.
Abstrak: Ants are the most successful eusocial insect in the world, since highly adapted to the environment. The objective of this research was to study ants community on male flower of oil palm. Observation of ants were done by using fix sample method during 10 minutes in 3 time periods, which is in the morning (08. 00 - 10.00 am), noon (10. 00 - 12. 00 am), and evening (13. 00 - 15. 00 pm). The observations of ants were conducted during four days in each month, i.e. April, May, June 2012. During observation we collected ant samples to identification process. Weather elements, i.e. air temperature, humidity, and light intensity were measured. Results showed that ant community on male flower of oil palm consist of nine genera belong to four subfamilies, i.e. Leptanilla (subfamily Leptanillinae), Oecophylla, Polyrhachis, Plagiolepis, Camponotus (subfamily Formicinae), Odontoponera, Platyhyrea, Pachycondyla (subfamily Ponerinae), and Myrmica (subfamily Myrmicinae). Leptanilla was a dominant ant species on male flower of oils palm. Diversity of ant community on male flower of oils palm was lower (H ’=0,99) and medium evennes (E=0,45).
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Judul: Sintesis layered double  hydroxide (LDH) dan aplikasinya sebagai adsorben kromium heksavalen (Cr(VI))
Abstrak: Layered double hydroxide (LDH) merupakan material hidrotalsit yang dapat berperan sebagai adsorben ion Cr(VI) melalui mekanisme tukar anion, adsorpsi-reduksi, dan interaksi elektrostatik. LDH MgAl dan MgAlFe disintesis menggunakan metode kopresipitasi dengan rasio molar M2+:M3+ sebesar 9:4,5. Hasil difraktogram XRD LDH MgAlFe menunjukkan terbentuknya fase hidrotalsit dengan puncak basal d003 mengalami pergeseran ke daerah 2θ yang lebih besar dibandingkan LDH MgAl, hal ini menandakan berkurangnya ukuran spesi basal dari LDH MgAlFe. Studi skala laboratorium dilakukan dalam mengkaji dosis dan profil isoterm adsorpsi dari LDH sebagai adsorben Cr(VI) yang dilakukan pada pH 4. Aplikasi LDH sebagai adsorben ion Cr(VI) menggunakan dosis optimum 12,5 mg/mL. Profil adsorpsi LDH MgAl mengikuti model isoterm Langmuir dan memiliki nilai kapasitas adsorpsi maksimum (Qm) sebesar 45,95 mg.g-1, sedangkan profil adsorpsi LDH MgAlFe mengikuti model isoterm Freundlich dan memiliki nilai kapasitas adsorpsi maksimum (Qm) sebesar 37,54 mg.g-1. Hasil adsorpsi menunjukkan bahwa LDH MgAl dan MgAlFe dapat berfungsi sebagai adsorben potensial dalam penanganan limbah ion Cr(VI)., Layered double hydroxide (LDH) is a hydrotalcite material that can serve as a Cr(VI) adsorbent through anion exchange, adsorption-reduction, and electrostatic interaction mechanisms. LDH of MgAl and MgAlFe materials were synthesized using the coprecipitation method with a M2+:M3+ molar ratio of 9:4,5. The results of the XRD diffractogram of LDH MgAlFe showed the formation of a hydrotalcite phase with a basal peak of d003 shifting to an area 2θ larger than that of LDH MgAl, which indicated a reduction in the basal spacing of LDH MgAlFe. A laboratory study was conducted to examine the dose and profile of the adsorption isotherm of LDH as Cr(VI) adsorbent at pH 4.The LDH can adsorb Cr(VI) at the optimum dose of 12.5 mg/mL. The LDH MgAl adsorption profile followed the Langmuir model has a maximum adsorption capacity (Qm) value of 45.95 mg.g-1. The MgAlFe LDH adsorption profile followed the Freundlich model has a maximum adsorption capacity (Qm) value of 37.54 mg.g-1. The adsorption results show that LDH MgAl and MgAlFe can function as promising adsorbents for treating Cr(VI) waste.
Keyword: isoterm adsorpsi, kromium heksavalen, layered double hydroxide, limbah ion logam