Prekonsentrasi dan Analisis Senyawa Renik Fenol pada Sampel Perairan: Optimasi Kinerja Adsorben pada Ekstraksi Padat-Cair

Dissolved phenol in aquatic system has potential risk on human health.Accordingly, quantification of phenol compound presents in aquatic samples by improvedmethodis of significantly required in the field of Environmental Chemistry. This study aimsto evaluate the usefulness of Sep Pak C18 cartridge as the adsorbent of phenol compoundprior to analyzed by Gas Chromatography. Study is focused on the sample pH and flowrate optimization to gain the best performance of cartridge. Results indicated thatadjusting the pH of 1-2 and the flow rate of 5 ml/minute of sample was highlyrecommended. Such a method is relatively accurate within the range of concentration 1.2ppb 15 ppm of dissolved phenol, thus it may be considered as an alternative method toanalyze phenol which exists within trace level in the aquatic systems. The method has beensuccessfully applied to analyze phenol in seawater samples from Losari Beach, Makassar

Characteristic of Coal Deposits in the East Kolaka, Southeast Sulawesi Province

Abstract Coal deposits in Southeast Sulawesi may not be large, one of the occurrence and deposit has been recorded in the Tawanga Village, East Kolaka Regency, Southeast Sulawesi Province. The study area is part of Southeast Arm of Sulawesi and the occurrence of coal is indicated from Meluhu Formation (TRm) which uncomformably overlying with schist of the Mekongga Complex (Pzm). In this study, field survey and proximate analysis of coal had been conducted to determine the distribution and quality of coal. Six coal samples from different area were subjected to the proximate analysis and the comparison of different properties including moisture content, volatile matter, fixed carbon, ash content and calorific values has been studied. The study is aimed to characterize of coal in the area through proximate analysis method. Field survey showed that the occurrence of coal as thin layers or lenses set in shale with thickness is vary from 5 to 20 cm. The analytical evaluation of properties showed the value of fixed carbon content 5.2 to 12.4%, the ash content 8.4 to 35.7%, the total moisture content 47.1 to 73.0% and volatile matter 7.0 to 10.7%. The analytical results suggest the existing of coal in the study area is classified as low rank calorie with the calorific value ranges between 1246.7 to 3644.6 cal/gr (adb).</jats:p