Questions about PPM unit conversion

This post was last edited by adsl121 on 2009-12-7 13:13. The ppm concentration is a concentration expressed by the mass of the solute in parts per million of the mass of the entire solution, also called the ppm concentration. ppm is parts per million or parts per million. In pesticide applications, it is usually used to express the concentration of the spray liquid, that is, the number of parts of the active ingredient of the pesticide in one million parts of the spray liquid. Nowadays, according to international regulations, parts per million are no longer expressed in ppm, but micrograms/ml or mg/liter or grams/cubic meter are used uniformly. The conversion formula between parts per million and percentage is:: 　　Parts per million = percentage/10 000. That is, the percentage divided by 10 000 is the parts per million. On the contrary, the parts per million multiplied by 10 000 is the percentage. 　　ppm is the unit of concentration used when diluting a very small amount of pesticides or fertilizers when preventing pests and diseases and applying root fertilizer in agricultural production activities. It is usually called "parts per million...". For example, 1ppm is one part per million, 150ppm is one hundred and fifty parts per million, etc. That is to say, when preparing a concentration of 1ppm, 1 gram of pesticide or fertilizer (referring to the pure amount) is added to 1 ton of water (1,000,000 grams), and so on. These pesticides or fertilizers generally only contain a few percent or tens of percent pure amounts, and the rest are fillers. Therefore, when formulating the concentration of pesticides or fertilizers, the amount of water to be added should be determined based on the pure content of the pesticide or fertilizer and the concentration to be diluted (in ppm units). Its calculation formula is: 　　The amount of water added per gram of pesticide or fertilizer = 1000000 × drug (fertilizer) content (%) ÷ concentration (ppm) For example: It is necessary to use 15% paclobutrazol to prepare a 300ppm solution and spray it on rice seedlings. How many grams of water should be added to 1 gram of pesticide? Calculated according to the calculation formula as follows: 　　Amount of water added = 1000000 × 15% ÷ 300 = 500 (g). That is, 1 gram of 15% paclobutrazol plus 500 grams of water can be prepared into a 300 ppm paclobutrazol liquid. 　　At present, in most scientific and technological journals, ppm is no longer used, but "‰" is used instead. ppm is converted into ‰: 1ppm=0.001‰.

This post was last edited by adsl121 on 2009-12-7 13:13 ppm is the volume specific concentration: Parts per million ppm is a way of expressing solution concentration (mass fraction of solute), ppm means one part per million. 　　for solution: That is, if there is 1/1000 ml of solute in 1 liter of aqueous solution, its concentration (mass fraction of solute) is 1 ppm. 　　for gas: One of the expression methods for the concentration of pollutants in the ambient atmosphere (air). 　　Volume concentration expression: The volume of pollutants contained in one million volumes of air, that is, ppm. The gas concentration measured by most gas detection instruments is the volume concentration (ppm). According to our country's regulations, especially the environmental protection department, gas concentration is required to be measured in units of mass concentration (such as: mg/m3) means that we * * The standard specifications also use mass concentration units (such as: mg/m³;) expressed.

This post was last edited by adsl121 on 2009-12-7 13:13. PPM is the mass concentration or gas volume concentration. If you want to convert like this, you must know the density before you can perform the conversion.

This post was last edited by adsl121 on 2009-12-7 13:13 The essence of PPM is one part per million, without units.

This post was last edited by adsl121 on 2009-12-7 13:14. The two definitions are different and cannot be converted.

This post was last edited by adsl121 on 2009-12-7 13:14. Look at what you want to convert. For example, H2S 10ppmV means that every million cubic meters of natural gas contains 10 cubic meters of H2S. The h2s of 10M3=10/22.414* 34=15.169kg=15169000mg So if converted into mg/m3 it is =15.169mg/m3

This post was last edited by adsl121 on 2009-12-7 13:15. The unit of liquid concentration is the ratio of the volume to the weight of the liquid, called one millionth.

This post was last edited by adsl121 at 2009-12-7 13:15 The conversion of concentration units ppm and mg/m3 is calculated according to the following formula: mg/m3=(M÷22.4)×ppm××(Ba÷101325)

This post was finally edited by adsl121 at 2009-12-7 13:16. Thank you masters.

Very simple, it is 10ppm, assuming that your solution is an aqueous solution