EVSC 220 Lecture Notes - Lecture 4: Polycyclic Aromatic Hydrocarbon, Phytoremediation, Bioremediation
Document Summary
Low ph it loses negative change and cant hold onto cations. Important source of reactivity and retention in soils that are low in 2:1 clay. Aggregation of primary particles (sand, silt, clay) into larger structural units. Looser or dry soils are more susceptible to erosion, larger aggregates are harder for wind and water to move. At micro-scale: som can bridge particles to form micro aggregates. At macro-scale: roots and fungal mycelia bridge micro-aggregates to form macro- aggregates. Rings join together (share c) to form pahs. Carbon in this form is going to be reduced, c is going to have a -1 charge. A reduced form of carbon reduced is where you get energy, carbon in carbon dioxide is oxidized with a 4+ charge. Found in gaseous, liquid, or solid forms. Molecular structure, composition, weight, solubility, vapour pressure, kow ( water ) Pah behaviour varies with number and arrangement of benzene rings. Those with <3 rings relatively volatile and water soluble.