Reference site Contaminated site Tunisian norms
Temperature (°C) 27 ± 1a 32 ± 2 35
pH 7.29 ± 0.06 8.83 ± 0.08 6.6-8.5
Dissolved O2(mg/L) 9.6 ± 0.47 4.5 ± 0.45 >6
Turbidity (NTU) 1.08 ± 0.05 2.57 ± 0.08 N.A
Total nitrogen (mg/L) 10.5 ± 2 245 ± 11.53 30
Lead (mg/L) 0.277 ± 0.01 0.277 ± 0.02 0.5
Cadmium (mg/L) 0.0038 ± 0.001 0.0198 ± 0.003 0.005
aData are reported as mean ± SD of three measurements of the same sample per
site. N.A: not available.
Table 1: Physico-chemical analysis of water samples from the Sousse bay polluted site and from Ghdamsi Island (Monastir) reference site.