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Environmental Chem

Exam #2

QuestionAnswer
Bioconcentration The process by which a compound becomes more concentrated in an organism because of the compound being more soluble in fatty tissue
Biomagnification A chemical whose concentrations increase along the food chain (occurs over time) ex. Eating a lot of fish a person can accumulate a lot of mercury.
BCF Bioconcentration Factor, the equilibrium ratio of the concentration of a specific chemical in a fish relative to that in the surrounding water
Acute Toxicity rapid onset of symptoms
Chronic Toxicity continuous, long-term exposure to a relatively low individual doses of a toxic chemical that is present in the air we breath, the water we drink, or the food we eat
LD50 The dose that proves to be lethal to 50% of the population of test animals
NOEL No observable effects level, threshold.
Thermal Pollution river of lake water that has been artificially warmed, at equilibrium, it will contain less oxygen than colder water because of the decrease in gas solubility with increasing temperature
COD chemical oxygen demand, a faster way to determine the oxygen demand of a water sample
BOD biochemical oxygen demand, the amount of oxygen consumed as a result of the oxidation of dissolved organic matter in the sample
TOC total organic carbon, used to characterize the dissolved and suspended organic matter in raw water
Alkalinity a measure of the ability of a water sample to act as a base by reacting with hydrogen ions
Hardness the total concentration of the ions Ca2+ and Mg2+
DDT dichlorodiphenyltrichloroethane,
DDE Dichlorodiphenyldichloroethylene, formed from the breakdown of DDT
Dose-Response Curves
Acid Mine Drainage oxidation of iron pyrite fool's gold produces soluble iron(III)sulfate, FE2(SO4)3,sulfuric acid.Fe3+ ion is soluble in the highly acidic water,the pH rises a yellowish-brown precip. of Fe(OH)3 forms from Fe3+,discoloring water&smothering plant&animal life
Lake Stratification Without mixing to provide dissolved oxygen, the lake bottom,lacking enough light for photosynthesis to occur,tends to have a very limited supply of oxygen during the summer.Respiration by animals and bacteria can deplete the dissolved oxygen at the botton
Created by: 8819352