551.5 mg/L = 551.5 ppm
| mg/L | ppm |
|---|---|
| 536.5 mg/L | 536.5 |
| 541.5 mg/L | 541.5 |
| 546.5 mg/L | 546.5 |
| 551.5 | 551.5 |
| 556.5 mg/L | 556.5 |
| 561.5 mg/L | 561.5 |
| 566.5 mg/L | 566.5 |
551.5 mg/L = 551.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm