405.5 mg/L = 405.5 ppm
| mg/L | ppm |
|---|---|
| 390.5 mg/L | 390.5 |
| 395.5 mg/L | 395.5 |
| 400.5 mg/L | 400.5 |
| 405.5 | 405.5 |
| 410.5 mg/L | 410.5 |
| 415.5 mg/L | 415.5 |
| 420.5 mg/L | 420.5 |
405.5 mg/L = 405.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm