2.Sources.11

2.Sources.11 - 2.Sources.11 Outline I. Definitions o...

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2.Sources.11 Outline I. Definitions o Toxicant: a chemical that causes an adverse effect at a dose or conc. of interest o Contaminant: chemical present at an abnormal conc. o Pollutant: a toxic contaminant o Threshold: the high enough conc. that can create a toxic effect The difference between a contaminant and a pollutant II. What is Normal? o Hg=2ppm, in SF bay o What does this mean? Is it normal? What is it usually? The difficulty is not measuring it, its placing a value judgment on it. o Normal can be defined time or space Place- “spatical normality” 2ppm may be normal here, but very low in Asia or elsewhere Time- “temporal normality” 2ppm used to be normal for today, but much lower or higher 100 years ago o “normal” for our atmosphere is usually referred to as representing conditions prior to the industrial revolution or about 1750 AD III. Environmental Fate: the study of the sources, transport, partitioning, transformations, and targets of chemicals in the environment
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This note was uploaded on 03/10/2011 for the course ETX 102A taught by Professor Ronaldtjeerdema during the Winter '10 term at UC Davis.

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2.Sources.11 - 2.Sources.11 Outline I. Definitions o...

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