Estimation of Chlorophyll-a and Pheophytin-a in an East Euphrates Drainage Water

This study was conducted at three sampling sites of Al – Haffar Drainage and was intended to estimate the spatial concentration of chlorophyll-a and pheophytin-a. For 6 months starting in December 2018 and lasting until May 2019. The air and water temperatures, light penetration, pH, electrical conductivity, dissolved oxygen, nitrate, and phosphate levels were measured. The results indicated a distinct spatial and temporal variation in the values of the variables that were analyzed. The third site reported an increase in air temperature and light penetration, while the second and third sites recorded the highest values of pH and electrical conductivity, and the third site also had values of dissolved oxygen that reached 8.9 mg/l. Nitrate concentrations were lowest in the third site (248g/l), while phosphate concentrations were lowest in the second site. The results of the current study show a significant decrease in the values of chlorophyll-a and pheophytin-a over the last months at all sites.