BIOL354 Lecture Notes - Lecture 3: Sewage Sludge, Rainbow Trout, Organic Semiconductor
25 Dec 2012
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Concentration: dose: total amount of substance administered/taken/absorbed by organism. Amount of solute if given in an aqueous form: concentration: quantity of substance per unit of a give medium/system (solute per solvent). Actual amount inside the organism is unknown. Inorganic pollutants (metals, metalloids, non-metallic inorganics & inorganic gases: metals: (naturally occuring @ low [], majority are anthropogenic) Sewage sludge run-off when used as an inexpensive nutrient amendment. Metal-based pesticides with arsenic & mercury (impacts cns). Ash & cinder disposal from burning firewood, incineration & cremation. Lead pellets (gizzards -> lead poisoning); pressure treated wood (playground w/ arsenic, chromium & copper); tanning leather, & tawing of pigs/goats (arsenic & chromium). Not biodegradable, are lustrous, malleable, & good electrical conductors. Can be an essential micronutrient or non-essential/toxic substance. Metal speciation: form(s) of an element in a given sample: free metal ions, inorganic metal complexes, simple organic metal complexes (edta)
