Parts per billion
EPA Glossary of Climate Change Terms
Number of parts of a chemical found in one billion parts of a particular gas, liquid, or solid mixture. See concentration.
Parts Per Billion (ppb)/Parts Per Million (ppm)
Units commonly used to express contamination ratios, as in establishing the maximum permissible amount of a contaminant in water, land, or air.
Source: Terms of the Environment ...
Parts per billion (ppb): Expressed as ppb; a unit of concentration equivalent to the µg/l.
PARTS PER BILLION: A unit frequently used to measure contamination concentration (parts of contamination per billion parts of water). One thousand parts per billion is equal to one part per million.
parts per billion (ppb)
Number of parts of a chemical found in 1 billion parts of a particular gas, liquid, or solid mixture.
parts per million (ppm) ...
A weight to weight ratio used to describe concentrations. ~ (ppb) is the number of units of mass of a contaminant per 1000 million units of total mass.
Also Âµg/L or micrograms per liter. (Source: GreenFacts) ...
~ (PPB) - 1 ppb is equivalent to 1 ug/L when discussing concentrations of substances in water.
A unit of measure used to describe levels or concentrations of contamination. A measure of concentration, equaling 0.0000001 percent. For example, One part per billion is the equivalent of one drop of impurity in 500 barrels of water.
P ~ in volume
Definition (english only)
A way to describe how much of a substance is contained in a sample: parts of analyte per billion parts of sample. In atmospheric chemistry this becomes volume parts of analyte per volume parts of atmosphere.
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ppb ~. Also µg/L or micrograms per liter.
ppm Parts per million. Also mg/L or milligrams per liter.
practical quantitation level (PQL) The lowest level achievable by good laboratories within specified limits during routine laboratory operating conditions.
Parts per million.
The number of existing disease cases in a defined population during a specific time period [contrast with incidence].
PPM: Parts per million.
Pressure, Total: In flowing air, the sum of the static pressure and the velocity pressure.
The concentration of a substance in water is usually expressed as milligrams per liter (mg/L) or micrograms per liter (μg/L), which are more casually referred to as parts per million (ppm) or as ~ (ppb), respectively.
Atmospheric concentrations of greenhouse gases are usually expressed in parts per million (ppm) or ~ (ppb). For example, atmospheric CO2 emissions have risen from approximately 280ppm to 385ppm in the last 250 years.
ppm or ppb: Abbreviations for 'parts per million' and '~,' respectively - the units in which concentrations of greenhouse gases are commonly presented. For example, since the pre-industrial era, atmospheric concentrations of carbon dioxide have increased from 270 ppm to 370 ppm.
06 ~ (ppb), the "safe maximum" recently proposed by California regulators. Yet even Norman, Oklahoma-the city with the highest level of chromium-6 among those studied-had only 12.
1 milligram per liter (mg/L) =1 part per million (ppm) =1000 ~ (ppb)*
1 microgram per liter (mg/L) =1 nanogram per milliliter (ng/mL) = 1 part per billion (ppb) *
1 nanogram per liter (ng/L) =1 part per trillion (ppt) = 1000 parts per quadrillion (ppq) * ...
A recently released World Health Organization (WHO) document has recommended a drinking water standard of 100 ~, up from the previous WHO .... soil.
A concentration unit of chemical constituents in solution; the weight of solute per unit volume of solvent, usually water, one thousand micrograms per liter is equivalent to 1 milligram per litre, this measure is equivalent to ~.
However, Philadelphia is the exception. Of the 162 homes tested by the city's Water Department, 15% exceeded the federal guidelines which specify that no more than 10% of the homes should exceed a lead level of 15 ~.
Partition Coefficient: Measure of the sorption phenomenon, whereby a pesticide is divided between the soil and water phase; also referred to as adsorption partition coefficient. ~ (ppb)/Parts Per Million (ppm): Units commonly used to express contamination ratios, ...
Common health effects of exposure to arsenic include stomach pain, vomiting, diarrhea, partial paralysis, blindness, thickening and discoloration of the skin. The Environmental Protection Agency set a arsenic standard of .010 parts per million (10 ~) for drinking water.
Also called pre-consumer material ppb ~. ppm Parts per million. Pre-consumer Recycle Content A product composition that contains some percentage of manufacturing waste material that has been reclaimed from a process generating the same or a similar product.
See also: What is the meaning of Environment, Environmental, Water, Concentration, Air?