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All Journal MARINA CHIMICA ACTA
Alfian Noor
Radiation Chemistry Laboratory, Hasanuddin University
Biochemistry, Genetics & Molecular Biology

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COMPARISON OF MEA, DEA AND TEA AS CO2 ABSORBENTS FOR Waode Nur Rahmaniah; Alfian Noor; Muhammad Zakir; Maming Gaffar
Marina Chimica Acta Vol. 16 No. 1 (2015): Enzyme from Bacteria and Coral Age
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (539.913 KB) | DOI: 10.20956/mca.v16i1.939

Abstract

Comparison of MEA, DEA and TEA as CO2 absorbent to measure carbon-14 activity of coral sample has been performed. This research aimed to Determine the age of coral reef sample of Spermonde Islands by measuring the activity of carbon-14 using the method Liquid Scintillation Counting (LSC). The sample of coral reef were collected in Langkai Island. The research were conducted by following steps of sample preparation, the CO2 absorption using the solutions of MEA, DEA and TEA. The measurement of the carbon-14 activities was performed using the Liquid Scintillation Counter (LSC) Hidex 300 SL. The research results indicated that the absorption capacities of MEA, DEA and TEA were 0.5180, 0.5903 and  the absorbents of MEA, DEA and TEA were 14.44, 14.59, and 14.42 DPM/g C respectively. The age of the coral reef sample, which was calculated based on the specific activity values using the absorbents of MEA, DEA and TEA were 480.15 ± 37; 390.11 ± 60 and 488.22 ± 87 years respectively.Keywords : LSC (Liquid Scintilation Counter), Carbon-14, CO2 Absorption, Alkanolamine, Langkai Island
EVALUATION THREE SCINTILLATORS USED FOR ACTIVITY Rahmawati Rahmawati; Alfian Noor; Maming maming; Muhammad Zakir
Marina Chimica Acta Vol. 16 No. 1 (2015): Enzyme from Bacteria and Coral Age
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.974 KB) | DOI: 10.20956/mca.v16i1.954

Abstract

Three scintillators, ultimagold, aqualight, and aquasol, have been applied to compare performance of liquid scintillation counter upon its C-14 activity measurement in biodiesel supplied by Pertamina in Makassar. The results showed that efficiency of aquasol is lower(0.2), while aqualight and ultimagold is higher (> 0.5). However eff iciency stability of ultimagold is considered better. It can be concluded that using ultimagold may provide more efficient and stable result and consequently more suitable as scintillator.
UTILIZATION OF SODIUM HYDROXIDE AS ABSORBER FOR 14C ANALYSIS Febby Kurniaty; Maming Maming; Muhammad Zakir; Alfian Noor
Marina Chimica Acta Vol. 16 No. 1 (2015): Enzyme from Bacteria and Coral Age
Publisher : Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (328.682 KB) | DOI: 10.20956/mca.v16i1.958

Abstract

Research on utilization of sodium hydroxide as absorber for 14C analysis of coral ages estimation in Langkai Island using LSC (Liquid Scintillation Counting) method has been done. Samples analyzed comes from Langkai Island, which is relatively low disturbing by human activities. Samples were cleaned according to physical and chemical treatment using mixture of acid-base solution: NaOH , H2O2 , HClO4 and HCl. This step remove about 8,62% mass of the sample and it leaves white. Carbonated of sample were remove as CO2 by reaction with HCl 10% and trapped by 5M NaOH as Na2CO3. Total carbon in the sample can be determined by titration method with the total weight of carbon sample are 0,2688 g / 8 mL. Specific activity of carbon-14 in the sample that were counted by Hidex 300 SL liquid Scintillation Counter were 14.72 ± 7.92 DPM/gC related to their age. By applying specific activity of the samples and specific activity carbon-14 in the modern carbon (15.3 ± 0.1 DPM/gC) to radioisotop desintegration equation, the age were 316,90±170,506 years.Keywords : Carbon Dating, Liquid Scintillation Counting, Coral, Spermonde Archiphelago
Co-Authors Febby Kurniaty Maming Gaffar Maming Maming Muhammad Zakir Rahmawati Rahmawati Waode Nur Rahmaniah