399 g/kg to PSU

399 g/kg = 400.955 PSU

g/kgPSU
384 g/kg385.882
389 g/kg390.906
394 g/kg395.931
399400.955
404 g/kg405.98
409 g/kg411.004
414 g/kg416.029

399 g/kg = 400.955 PSU

Formula

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