391.5 mg/L = 391.5 ppm
| mg/L | ppm |
|---|---|
| 376.5 mg/L | 376.5 |
| 381.5 mg/L | 381.5 |
| 386.5 mg/L | 386.5 |
| 391.5 | 391.5 |
| 396.5 mg/L | 396.5 |
| 401.5 mg/L | 401.5 |
| 406.5 mg/L | 406.5 |
391.5 mg/L = 391.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm