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The self-purification capacity of river water is an essential indicator for a healthy river. Various organic and inorganic pollutants, both from point sources and nonpoint sources, in most streams in Banjarmasin were beyond the river self-purification capacity, which caused a decrease in the river water quality. This study attempted to identify the river water pollution distribution in the city of Banjarmasin and determined the self-purification points. We used the purposive sampling technique to carry out river water sampling, with criteria for pollutant sources and distance of pollution taken into consideration. By using the trend analysis techniques, we analyzed the parameters concentration to relate it to the range of pollution so that we were able to identify the pollution distribution and determine the self-purification distances. The results indicated that the self-purification process could take place on the river flow in of Banjarmasin even though it did not reach the clean water zone. The river in Banjarmasin requires a longer purification distance so that the self-purification process can run correctly.

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The preliminary phytochemical screening and fluorescence characterization of several medicinal plant extracts from East Java Indonesia have been carried out. Some medicinal plants used in this study are Annona muricata, Strobilanthes crispus, Piper ornatum and Andrographis paniculata. The objective of this research is to find out the result of phytochemical screening and characterization of several medicine plants by fluorescence spectroscopy. The plant part in the form of leaves is extracted using maceration method. The extraction process was carried out for 3 days with ethanol solvent in room temperature. The result of preliminary phytochemical screening showed the existence of secondary metabolite compounds in several medicinal plant extracts, among others, alkaloid, saponin, terpenoid, steroid, tannin and flavonoid. The fluorescence characterization spectra obtained shows that several medicinal plant extracts have optimum absorption at wavelength of excitation of 323 – 342 nm and wavelength of emission of 662 – 685 nm.