Parts per Million and Parts per Billion
المؤلف:
D. A. Skoog, F. J.Holler, D M. West, and S. R. Crouch
المصدر:
Fundamentals of Analytical Chemistry
الجزء والصفحة:
9th ed - p71
24-8-2016
2249
Parts per Million and Parts per Billion
For very dilute solutions, parts per million (ppm) is a convenient way to express concentration:
where cppm is the concentration in parts per million. The units of mass in the numerator and denominator must agree so that they cancel. For even more dilute solutions, 109 ppb rather than 106 ppm is used in the previous equation to give the results in parts per billion (ppb). The term parts per thousand (ppt) is also used, especially in oceanography.
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