This preliminary study presents a theoretical and experimental investigation on the absorption of CO2 into KOH solution. The study provides variation of KOH concentrations at 1, 2, 3, 4, and 5 N. The value of pH was observed for each increment of sample volume. The absorbed CO2 was measured by applying titration. The amounts of CO2 resulted from every provided KOH concentration were respectively 0.0075, 0.0075, 0.0232, 0.0305, and 0.0395 mol. The results reveal an increase in absorbed CO2 with each increment of KOH concentration. The absorption efficiency values of each KOH concentration were 0.3750, 0.4000, 0.3861, 0.3813, and 0.3950 mol total CO2/mol KOH, respectively. The difference values of experimental and theoretical absorbed CO2 may be caused by the formation of other compounds.

This study aims to determine carbon-14 activity on coral from Barrang Caddi. Several stages of research were physical and chemical cleaning to eliminate contamination on coral. CO2 absorption pre-treatment method, titration to determine total carbon absorbed in the process of absorption CO2 and enumeration with LSC Hidex 300 SL to determine the optimum time of enumeration, the average value of activity 14C and specific activities 14C. In this study, marble from marble karst, Maros, was used as a background. The results show that the absorption capacity was 0.2188 mol CO2/mol OH, the absorption efficiency of 21.87%, total carbon mass was 0,168 gram, optimum counting time was 15 minutes, average activity 14C was 433,597 DPM, enumeration efficiency was 0,567 and specific activity was 15.262 DPM/gC. It was concluded that coral in Barrang Caddi relatively new.

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Optimization of the comparison between the AquaLight LLT cocktail and an aqueous sample had been carried out. AquaLight LLT cocktail was mixed with aqueous sample. The variation ratio between the aquaLight cocktail and the sample