Radiolysis of Reactive Azo Dyes in Aqueous Solution

The effects of radiation on aerated reactive dye solutions i.e Cibacron Violet, Cibacron Orange and Cibacron Yellow solutions have been studied. Parameters analysis were the change of pH after radiation, the change of absorption, degradation products and effects of pH on the radiolysis. The uv-vis absorption of solutions were observed before and after irradiation. pH variation was done from pHs 3, 5, 7, 9 and 12. Irradiation was done at doses of 0, 2, 4, 6, 8 and 10 kGy with dose rate of 5 kGy/h and was determined by a Fricke dosimeter. HPLC with UV detector was used to analyze the degradation products. Oxalic acid was the main degradation product and small amount of succinic acid was also detected

Hydrocarbon Distribution in Sediments of Jakarta Bay

The analysis of sediments hom stations I, 29, 9, I5, 17 and 25 located in Jakarta Bay were carried out. Sampels were Soxhlet-extracted for I4 hours with methylene chloride J methanol (I: I ), followed by saponi/icatian using KOH in methanol and benzene, Unsaponwcation parts were extracted using n-hexanes. Extracted samples were analyzed using gas chromatography with capiler column of SPB-I. From chromatogram results it was noted that the analysis of sea sediment sea from each station in Jakarta Bay indicate the distribution if n-allranes in the range of CN-C;6 which were dominated by an even carbon. From the results it is assumed that Jakarta Bay sediment may have natural hydrocarbon sources which may come from either the red or blue algae