Détermination de la demande chimique en oxygène (DCO) et la demande biochimique en oxygène (DBO) de l’eau de mer Sidi Medjdoub et Sablet

Abstract

In the field of the environment, it is very important to have tools capable of detecting the presence of pollutants or toxic substances in aquatic ecosystems. and important to control the quality of seawater by measuring physico-chemical parameters in order to protect human health and preserve marine biodiversity. Our main objective is the study of the seawater quality of the two sites Sidi Medjdoub and Sablet during three months April, May and June. The results obtained showed that the pH and the temperature of the sea water of the two sites are in the norm, the turbidity is lower than the norm, the conductivity and the concentration of the chlorides are higher than the norm which proves the Presence. In addition, the nitrate and nitrite contents exceed the standard. the total weight is higher than the norm. The values of the chemical oxygen demand COD of the sea water of the Sidi Medjdoub site vary between 60mg / let 59.07mg / l against those of the Sablet site are between 56.4mg / l and 50.52mg / l they are below the standards which 90 mg / l The values of the biochemical oxygen demand BOD5 of the seawater of the two sites Sidi Medjdoub and Sablet are below the norm.