403.5 mg/L = 403.5 ppm
| mg/L | ppm |
|---|---|
| 388.5 mg/L | 388.5 |
| 393.5 mg/L | 393.5 |
| 398.5 mg/L | 398.5 |
| 403.5 | 403.5 |
| 408.5 mg/L | 408.5 |
| 413.5 mg/L | 413.5 |
| 418.5 mg/L | 418.5 |
403.5 mg/L = 403.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm