420.5 mg/L = 420.5 ppm
| mg/L | ppm |
|---|---|
| 405.5 mg/L | 405.5 |
| 410.5 mg/L | 410.5 |
| 415.5 mg/L | 415.5 |
| 420.5 | 420.5 |
| 425.5 mg/L | 425.5 |
| 430.5 mg/L | 430.5 |
| 435.5 mg/L | 435.5 |
420.5 mg/L = 420.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm