4,205 ppm to PSU

4,205 ppm = 4.226 PSU

ppmPSU
4,190 ppm4.211
4,195 ppm4.216
4,200 ppm4.221
4,2054.226
4,210 ppm4.231
4,215 ppm4.236
4,220 ppm4.241

4205 ppm = 4.226 PSU

Formula

1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)