Open Access

Tableau 1

Grille de calcul et classes de qualité de l’IPO.

Calculation grid and quality classes of IPO.

  Paramètres

  DBO 5 (mg/L) Ammonium (mg/L) Nitrites (μg/L) Orthophosphates (μg/L)
Classes        
5 < 2 < 0.1 5 15
4 2–5 0,1– 0,9 6–10 16–75
3 5,1–10 1–2,4 11–50 76–250
2 10,1–15 2,5–6,0 51–150 251–900
1 > 15 > 6 > 150 > 900
Classes de l’IPO Valeur de l’IPO État de la pollution organique    
5 5,0 − 4,6 Nulle    
4 4,5 − 4,0 Faible    
3 3,9 − 3,0 Modérée    
2 2,9 − 2,0 Forte    
1 1,9 − 1,0 Très forte    

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.