The contractor requests a Salt contamination measured in ppm. Is this egual to mg/m2?
No, these two results are not equal. The unit ppm is a volumetric unit, where mg/m2 describes a surface area. The concentration in ppm can at best only describe the salt concentration in the 15 ml cup. When a contractor requires the contamination level to be measured in ppms always request an analysis protocol to prevent wrong measurements.
