poids (1) sol (1) fleuve (1) province (1) analyse (1) chromatographie en phase gazeuse (1) gaz (1) évaluation (1) distribution (1) Afrique (1) Treatment (1) Hexachlorobenzene (1) Value (1) South Africa (1) Soils (1) Sewage (1) Rivers (1) Polychlorinated biphenyls (1) Pesticides (1) Mass spectrometry (1) Gas chromatography (1) Gas (1) Evaluation (1) Average (1) Weight (1) Analysis (1) Endrin (1) Evaluation (1) province (1)