Fifteen water samples were collectedthroughout the study period in
cleaned, sterilized, 1L screw cap glass bottles. Examination of samples was
conducted immediately following return to the laboratory.Dissolved oxygen
(Azide modification method) and chemical oxygen demand were measured as
described in standard methods for the examination of water and wastewater
(American Public Health Association, 1992). Temperature measurements were
made in situ. Conductivity and pH of water were measured by Corning pH-meter 215 and Corning® TDS-60 Sensor respectively.