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Biology 2485B - Lec 10.docx

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Biology 2485B
Ben Rubin

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Lec 9 Feb 6, 2014 PCBs – high levels of PCBs in inuit women breast milk • Significantly high in Inuit women than in Caucasian women • Why? o Diet – bio­accumulation in food sources such as whales  High on the food chain   Long lived animals o Air currents move pollutants up towards the poles  Polar cells move pollution up into the poles  Precipitation concentrates the pollutants o Rate of incorporation > rate of breakdown + excretion • Global wind currents o Causes global distillation – polax vortex concentrates pollutants  Bio­magnification • Magnified accumulation of pollutants going up trophic levels • Depends on water solubility, air currents, persistence Industrial smog – sulfur usually from coal leads to acid rain • SO2  ▯SO3  ▯H2SO4  ▯(NH4)2SO4 • Carbon output from coal and oil makes GHGs  ▯CO2 Photochemical oxidation (smog) • Nitrogen converted by burning into nitrogen oxide (NO) o NO + O2  ▯Nitrogen dioxide (NO2) • UV radiation + NO  ▯O3 + VOC  ▯pollutants • NO + H2O  ▯nitric acid  ▯acid rain • NO2 + hydrocarbons  ▯PANS • Stratospheric ozone blocks UV light • Tropospheric ozone interacts with pollutants and creates more reactive molecules   ▯by oxidation o Depends on thermal inversion  If inverted = more smog and buildup of pollutants o Usually builds up at night time and N and O react when sun comes up Question • In the US in 1991 the risk of heart rate was quantified as an average loss of 1607  days of life expectancy. Evaluate the risk of homicide in similar terms. o Answer is 93  o Not obvious for us to judge the probabilitie
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