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adoption of corrective measures, that are costly and not all the time efficient, is tough because of the evolution of the contaminant within the medium and the consequent problem in establishing a analysis of the cause-impact relationships. Therefore, the vulnerability of an aquifer to pollution signifies the sensitivity of groundwater to an alteration in its quality attributable to human activities. In addition to the affect exerted by the unsaturated zone, the vulnerability of groundwater as a consequence of a air pollution episode can also be conditioned by climatological factors , and others associated to the polluting load corresponding to method and place of penetration, mobility, and persistence of the pesticide . Adsorption, degradation, and movement are the important thing processes conditioning the behavior and destiny of pesticides within the soil. Six processes that can move pesticides are leaching, diffusion, volatilization, erosion and run-off, assimilation by microorganisms, and plant uptake. Leaching is the vertical downward displacement of pesticides through the soil profile and the unsaturated zone, and at last to groundwater, which is vulnerable to air pollution. Pesticides are frequently leached by way of the soil by the effect of rain or irrigation water. Pesticide leaching is highest for weakly sorbing and/or persistent compounds, climates with excessive precipitation and low temperatures, and soils with low natural matter and sandy texture. On the opposite, for pesticides with a low persistence that disappear shortly, the chance of groundwater air pollution significantly decreases. Different and diversified factors such as physical-chemical properties of the pesticide, a permeability of the soil, texture and organic matter content of the soil, volatilization, crop-root uptake, and method and dose of pesticide application are liable for the leaching price of the pesticides. Soils which are excessive in clays and organic matter will gradual the movement of water, connect simply to many pesticides, and usually have the next diversity and population of soil organisms that can metabolize the pesticides. The methods of this research must be relevant to air high quality monitoring in different areas of the world. However, these methods
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