Colombie (2) Pesticides (2) Attention (2) Estudio (2) Atención (2) Pesticidas (2) Minors (1) Origin (1) Water resources development (1) Water quality (1) Trademarks (1) Swine (1) Sewage (1) Sanitation (1) Sand (1) Sampling (1) Rural population (1) Runoff (1) Refuse and refuse disposal (1) Quality of products (1) Public health (1) Population (1) Pollution (1) Oxidation (1) Months (1) Mineral industries (1) Milk--Pasteurization (1) Milk (1) Mass spectrometry (1) Irrigation (1)