Effects Of Humic Substances On Photodegradation Of Antibiotics In Waters

This paper concerns the photochemical degradation of antibiotics in the water. Antibiotics are widely used in human medicine, veterinary medicine and aquaculture, since a long time antibiotic have been used in the marine environment for decades to ensure the development of marine resources (for examples:animals, vegetal). So using antibiotics in sea water or veterinary medicals and also human medicine can cause a bigger problem in the aquatic and terrestrial environment, and then the presence of pharmaceuticals in water has become a great concern due to the potential negative effects on humans and aquatic ecosystems.The presence of antibiotics in the water, a threat to human health. Photochemical degradation is one of the main ways to analysis the transformation of antibiotics in the environment, in this process played an important role in humus. On the one landwith a light absorbing humus, may compete with antibiotic absorption of photons; on the other land can produce humus excited state absorption of light energy and reactive oxygen species, indirect photolysis of antibiotics may lead. At the same time, the role of humus and humus to the molecular structure of the source and antibiotics, as well as environmental factors, and many other related antibiotics. This paper chooses thiamphenicol, oxytetracyclin and ofloxacin three commonly used antibiotics, which were studied in the simulation of photochemical degradation in seawater and freshwater. Photolysis impact studies humus and halogen ions on them, taking into account the influence of pH, light and other factors. This study reveals the photochemical behavior of antibiotics in the environment, as well as the influence of humus their photochemical behavior. So in this present work concern to identification the different effects of humic substances on photodegradation of antibiotics in the waters.In addition, humic acids (HA) is mostly important to know the effects of photodegradadtion of antibiotics in aquatic area, also High performance liquid chromatography (HPLC) will be used to analysis the photodegradation of our three antibiotics such as:thiamphenicol, oxytetracyclin and ofloxacin. However, artificial sea water and pure water will be used and then, some machine like photoreactor will be used, it is a specialized type of lamp that can produce an electric light which is produces light by passing electricity through ionized xenon lamp at high pressure. It produces a bright white light that closely mimics natural sunlight, the first systematic study on the photocatalytic oxidation of humic acid(HA) in artificial sea water (ASW).Therefore, this web knowledge of the photo degradation of antibiotics is crucial in predicting the behavior and environmental impact of these pollutants after their entry into natural waters. So many natural water constituents such as dissolved organic matter (DOM) and hydrogen peroxide (H2O2) can be used as photosensitizers. DOM either can form excited triplet states (3DOM*) upon solar irradiation and subsequently induce the generation of reactive oxygen species (ROS). Finally, the removal rate of photodegradation will be determined with different initial concentration of humic acids will be added in the solution to know their effects on photolysis of antibiotics and then pH will be investigated in our analysis.