How well do you know your RMP chemicals? I mean really know them. One of the top questions we have received in the past several years is asking about the RMP chemicals’ toxic endpoints and why EPA uses mg/L instead of ppm. PPM is a volume-to-volume or mass-to-mass ratio, whereas mg/l is a mass-to-volume relationship. We can convert from mg/L to ppm pretty easily, using the following equation and knowing the molecular weight of the chemical:
Getting to know your toxic end points
