Application of organic pollution Index (OPI)‎ to assess the water quality of al-Chibayish Marsh, Southern Iraq

الملخص EN

The Organic Pollution Index (OPI) was applied for descriptive and quantitative assessment the levels of organic contamination at six stations selected at Al-Chibayish marsh monthly during the period August, 2018 to July, 2019.

Selected a set of physical and chemical variables affecting the organic pollution index (NO2, NH4, BOD5 and PO4).

Results showed that the values of pollution index ranged from 3.

8 to 4.

5 during the studied period.

Generally, the value of OPI was (4.

2) for Al-Chibayish marsh, which is classified as the second category (weak).

Principal Component Analysis (PCA) showed that the most controlling factors in the organic pollution index wer nitrite and ammonium ion followed by biological oxygen demand and active phosphate.