| ppb |
Some constituents in water are measured in small units. Many of the trace metals such as mercury and organic compounds such as trihalomethanes are monitored by Tucson Water are measured in terms of parts per billion (or micrograms per liter). To help you visualize how very small this unit is, we offer the following illustrations.
출처: www.ci.tucson.az.us/water/terms_and_definitions.ht...
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| ppb |
A ratio used to describe the proportion of one substance to another. In terms of time, l ppb is equal to one second in 32 years.
출처: www.gem.msu.edu/gw/vocabulary/glossary.html
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| ppb |
Parts per billion. 1 ppb = 1 in 1,000,000,000. Typical means of measuring gas purity
출처: www.puregastechnologies.com/glossary.htm
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| ppb |
Contaminant concentration units: parts of contaminant per billion parts of phase (eg, water or soil)
출처: www.cibageigysite.org/static_pages/Glossary.htm
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| ppb |
Micrograms per liter (mcg/L)-one part per billion corresponds to one minute in 2,000 years.
출처: www.toua.net/water/CCR-2002/def.htm
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