Photometric and Fluorimentric Data for Pollution Monitoring in River Waters

River water samples were subjected to chemical and optical analysis. Pollution by city wastewaters was observed by increase of total nitrogen concentration (TN) and electric conductivity (EC) in water samples. In most cases pollution was followed by decrease of optical density at 254 nm $(\text{D}_{254})$ (by 10-50%) due to high natural background values. Pollution changed fluorescence intensity (I) for protein-like fluorophores (increase by 10-120%) and humic-like fluorophores (±15%). Calculations showed that measurement of $\text{D}_{254}$ with one detector was not informative for water quality monitoring because $\text{D}_{254}$ for polluted waters were in the frames of seasonal variation for the unpolluted waters in suburban part of river. Increase of I was able to detect presence of 10-90% of wastewater with the background of unpolluted river water. The best parameter for this was I at excitation wavelength 230 nm and emission wavelength 350 nm. Relative parameter F showing ratio of protein-like I to humic-like I was not informative in pollution monitoring.