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Parts per million (ppm) and parts per billion (ppb) show a relationship between two quanti-ties that use the same units. A part per million could be one drop per one million drops, one gram per one million grams, etc. By definition, one ppm = 1,000 ppb.
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Very low solute concentrations are often expressed using appropriately small units such as parts per million (ppm) or parts per billion (ppb). Like percentage (“part per hundred”) units, ppm and ppb may be defined in terms of masses, volumes, or mixed mass-volume units.
In the case of ppb, the same relationship exists: 1 part material per 1 billion parts of a gas, liquid or solid. An easy way to think of ppm is to visualize putting four drops of ink in a 55-gallon barrel of water and mixing it thoroughly. This procedure would produce an ink concentration of 1 ppm.
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The symbols ppm, ppb, and ppt are used to escape this problem. They are best thought of as non-SI units for dimensionless quantities with the meanings 10 −6, 10 −9, and 10 −12 respectively. They are abbreviations for the words parts-per-million, parts-per-billion, and parts-per-trillion.
Concept of ppm: 1 ppm = 1 part of substance in one million parts of water solution, or 1/1,000,000 . 1 ppm = approximately one second in 11.6 days . Concept of ppb: 1 ppb = 1 part of substance in one billion parts of water solution, or 1/1,000,000,000 . 1 ppb = approximately one second in 31.7 years . Concept of ppt: 1 ppt = 1 part in one ...
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ppb – parts per billion (used for heavy metals and organics) pptr – parts per trillion (used for trace metals and trace organics) The following table summarizes common mass ratios for solutions and solids.
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Jan 30, 2023 · Parts per Million: A concentration of a solution that contained 1 g solute and 1000000 mL solution (same as 1 mg solute and 1 L solution) would create a very small percentage concentration. Because a solution like this would be so dilute, the density of the solution is well approximated by the density of the solvent; for water that is 1 g/mL ...
