échantillonnage (2) Sampling (2) Days (2) Sampling (2) surveillance de l'eau (1) saison (1) pollution (1) membrane (1) laboratoire (1) extraction (1) exposition (1) enrichissement (1) investigation (1) barrage (1) contamination (1) comparaison (1) calcul (1) Afrique (1) Comparison (1) Cases (1) Atmospheric deposition (1) Chromatograms (1) Rates (1) Technique (1) Year (1) Winter (1) Weights and measures (1) Water (1) South Africa (1) Sewage (1)