BREE 533 Lecture Notes - Lecture 4: Soil Horizon, Atrazine, Organochloride
23 Jan 2018
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Chemical contaminants: ma(cid:272)(cid:396)o(cid:374)ut(cid:396)ie(cid:374)ts (cid:894)n a(cid:374)d p(cid:895, i(cid:374)o(cid:396)ga(cid:374)i(cid:272) (cid:272)he(cid:373)i(cid:272)als (cid:894)(cid:373)etals(cid:895, o(cid:396)ga(cid:374)i(cid:272) (cid:272)he(cid:373)i(cid:272)als (cid:894)pesti(cid:272)ides(cid:895, e(cid:373)e(cid:396)gi(cid:374)g su(cid:271)sta(cid:374)(cid:272)es (cid:894)pha(cid:396)(cid:373)a(cid:272)euti(cid:272)al(cid:895) Also called orthophosphate or soluble inorganic p which is readily available to plants. Plant stoichiometry: a(cid:374) i(cid:373)po(cid:396)ta(cid:374)t fa(cid:272)to(cid:396) i(cid:374) the p(cid:396)o(cid:272)ess is the stoi(cid:272)hio(cid:373)et(cid:396)i(cid:272) (cid:272)o(cid:373)positio(cid:374) of o(cid:396)ga(cid:374)i(cid:272) (cid:373)atte(cid:396). 2- + 108h2o = c106h263o110n16p1 + 107o2 + 14h+ (equation 1) C : n : p = 106*12:16*14:1*31 = 1272:224:31 = 40%:7. 2%:1% Suppose that a lake has a volume of 1*106 m3 and a phytoplankton concentration of 10 ug/l of chlorophyll a. Inorganic chemicals: the(cid:396)e a(cid:396)e thousa(cid:374)ds of (cid:272)he(cid:373)i(cid:272)als (cid:272)a(cid:374) (cid:271)e fou(cid:374)d i(cid:374) (cid:449)ate(cid:396). Alkalinity refers to the capability of water to neutralize acid. Common natural buffer: co3 (carbonates like limestone). In natural systems: 50 150 mg/l as caco3. Toxic metal widespread in groundwater: o(cid:272)(cid:272)u(cid:396)s (cid:449)idel(cid:455) i(cid:374) a(cid:395)uife(cid:396)s. Deep sandy aquifer layers originating as riverine, lake or coastal deposits. Ganges, mekong and red river deltas, sandy alluvial deposits in south asia, south east asia, south.
