| الوصف: |
The study aimed to investigate Physical, Chemical and invertebrate organisms as biological test in water samples collected from the waters of the Tigris River passing through Al-Ishaqi District / Salah Al-Din Governorate, for the period from October 2020 to March 2021. Physical and Chemical test Changes in water temperatures were recorded, as the lowest value was 11.5 C O in December 2020 and January 2021 in the river stations 3 and 1, respectively, while the highest value recorded was 20.8 CO for October 2020 in station 4. Varying levels of turbidity appeared, as its highest value was 292,294 in January 2021 in stations 1 and 5, and its lowest value was 240 in October in station 3. The results showed different values for conductivity, the highest value was 506 μS/cm for March 2021 in station 1, and the lowest value was 361 μS/cm for October 2020 in Station 5. The highest value of the average dissolved solids was 209 ppm in March in Station 4, and the lowest value was 173 ppm for October 2020 in Station 2. It was found that the pH values recorded the highest value of 8.4 in October 2020 in station 1, and the lowest value was 7.2 for March in station 5. The lowest value of dissolved oxygen was 6.7 ppm for March in Station 1, and the highest value for November 2020 in the river station 5. The highest value of the biological oxygen demand was 4.4 ppm for March in Station 2, and the lowest value for it was 0.6 ppm for December 2020 in Station 1. Biological test for invertebrate organisms shows Three types of invertebrates were diagnosed are Daphnia, Stentor and Amoeba proteus. The highest number of samples was recorded during January and March in Stations 2and 1 respectively, and the lowest number of samples was in October in Station 2 and November in Station 3. |