INVESTIGATION OF SULFUR COMPOUNDS IN SELECTED STAGNANT WATER BODIES
Sulfur compounds, primarily in the form of sulfides (S2.), sulfites (50)'") andsulfates (50t) have been neglected but has a strong effect upon water quality.The dark colour sediments and strong unpleasant ordours often indicate the 52.contamination in aquatic bodies. To the best of our knowledge, no attempt hasbeen made to investigate these compounds and to asses their contribution to thedegradation of water quality. Both the bacteria and dissolved oxygen (DO) areplaying leading roles in determining the fate of 5 containing compounds inaquatic systems.
In this investigation it was intended to study the possible relationships betweensulfur species and DO. Four urban stagnant water bodies effected by impropersewage disposal, industrial waste, wet and dry deposition of atmospheric 50/'were investigated along with a prawn farm and two coconut husk soaking pitsinherited with S compounds. These water bodies indicated the emission ofvolatile 5 compounds. These water bodies indicated the emission of volatile 5compounds From their characteristic rotten egg smell.
Under this study 52., SO)·2 and 50t levels were monitored along with DO, pHand temperature to investigate the possible correlation method introduced byPawlak and Pawlak (1999) was employed in determination of 52. levels while allother parameters were measured by employing standard methods.
Based on the results obtained, only S2. shows a significant correlation with DOunder ambient conditions. Finally, measured dissolved 52. levels were utilized todetermine the possible H25 emission levels. Calculations have shown that each ofthe water body is emitting gaseous H25 and in most cases, emission levels aregreater than the ordour thresholds accounting for the unpleasant smell near thesestagnant water bodies.