231.5 g/kg = 232.634 PSU
| g/kg | PSU |
|---|---|
| 216.5 g/kg | 217.561 |
| 221.5 g/kg | 222.585 |
| 226.5 g/kg | 227.61 |
| 231.5 | 232.634 |
| 236.5 g/kg | 237.659 |
| 241.5 g/kg | 242.683 |
| 246.5 g/kg | 247.708 |
231.5 g/kg = 232.634 PSU
1 g/kg ≈ 1.0049 PSU · 1 mg/L ≈ 0.001 PSU · 1 ppm ≈ 0.001 PSU (dilute aqueous approximation)