345.5 mg/L = 345.5 ppm
| mg/L | ppm |
|---|---|
| 330.5 mg/L | 330.5 |
| 335.5 mg/L | 335.5 |
| 340.5 mg/L | 340.5 |
| 345.5 | 345.5 |
| 350.5 mg/L | 350.5 |
| 355.5 mg/L | 355.5 |
| 360.5 mg/L | 360.5 |
345.5 mg/L = 345.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm