| ppb |
the number of "parts" by weight of a substance per billion parts of water. Used to measure extremely small concentrations. One microgram per liter of water is approximately equal to a ppb.
출처: mvhs1.mbhs.edu/riverweb/glossary.html
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| ppb |
similar in concept to ppm except they are smaller and consequently there can be more of them, 1 ppm = 1000 ppb If you have 0.010 mg lead/L this equals 0.010 ppm lead or 10 ppb lead (0.010 ppm x 1000ppb/ppm).
출처: wyagric.state.wy.us/aslab/wmterms.htm
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| ppb |
This works like above, but we multiply by one billion (10 9 ; caution: the word billion has different meanings in different countries). A solution with 1 ppb of solute has 1 microgram (10 -6 g) of material per liter.
출처: www.ilpi.com/msds/ref/concentration.html
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| ppb |
parts per billion. Roughly equivalent to g/l .
출처: www.tnrcc.state.tx.us/permitting/waterperm/pdw/glo...
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| ppb |
Parts Per Billion equivalent to micrograms per kilogram
출처: www.i-s-e-s.com/acronymsglossary.htm
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