PPB is the abbreviation of one billionth, which is one billionth in Chinese. It is a professional unit used to express the concentration of tiny substances in solution. In the field of environment and science, PPB units are widely used to measure the contents of various tiny substances, including toxic substances, pollutants, nutrients and other chemicals.
The concept of PPB unit is very simple, that is to say, in every billion units, one unit is what we call a substance. For example, in environmental monitoring, scientists will use PPB to measure the concentration of harmful gases (such as sulfur dioxide, ozone and nitrogen dioxide) in the atmosphere to assess air quality and potential health risks. In water quality monitoring, PPB units are used to measure trace heavy metals (such as lead, mercury and cadmium) or organic pollutants (such as pesticide residues) in wastewater or natural water.
Extension of ppb
Ppm10 (minus 6 power of10) is quite microgram.
Ppb10 (minus 9 power of10) is equivalent to nanogram.
PPT 10 (minus the power of 12) is equivalent to Pique level.
10 is of the order of -9, a relatively small unit, and there are also ppm, ppt and so on. , which are -6 times and-12 times respectively.
When indicating the concentration of the solution, 1ppm is 1 μ g/ml or 1 mg/L. When indicating the content of components in the solid, 1ppm is 1ug/g or 1g/t,/kloc.
parts per million
parts per billion
Ppt One Trillion One Trillion
PPm, PPb and PPt are taken out separately, which can't be said to be units, just like%, but not units. When used, it can be defined as v/v, n/n, m/m, g/l, g/m3 and so on.
PPm is -6 power of 10.
PPb is -9 power of 10.
PPt is-10 to the second power.
Reference to the above content: Baidu Encyclopedia -—PPB