In the previous chapter, we explored the transport of chemicals from one physical compartment to another—but only in their free molecular form. The reality, however, is much messier than that, as solid particles can travel in water and both solid and liquid aerosols can travel in the air. While particles moving in water and those moving in air are governed by different forces, there are also some striking similarities. One is the relationship between particle size and travel distance: the smaller the particle, the greater the distance that it is likely to travel. The second deals with colonization, as toxic chemicals can bind to particles, hitching a ride on them as they travel downstream or downwind.
KeywordsSuspended Particulate Matter Sediment Particle Total Suspended Particulate Mountain Stream Dirt Road
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