423.5 mg/L = 423.5 ppm
| mg/L | ppm |
|---|---|
| 408.5 mg/L | 408.5 |
| 413.5 mg/L | 413.5 |
| 418.5 mg/L | 418.5 |
| 423.5 | 423.5 |
| 428.5 mg/L | 428.5 |
| 433.5 mg/L | 433.5 |
| 438.5 mg/L | 438.5 |
423.5 mg/L = 423.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm