what is ppm?how to prepare 75 ppm?
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Answer Posted / lutfor shikder
ppm stands for parts per million.Mathematically it is mg/L. To make 75 ppm we have to 75 mg of the target substance into a 1 Lite volumetric flask and dissolve it with the diluent and finally make volume up to the mark.
ppb= mcg/L
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