542.5 mg/L = 542.5 ppm
| mg/L | ppm |
|---|---|
| 527.5 mg/L | 527.5 |
| 532.5 mg/L | 532.5 |
| 537.5 mg/L | 537.5 |
| 542.5 | 542.5 |
| 547.5 mg/L | 547.5 |
| 552.5 mg/L | 552.5 |
| 557.5 mg/L | 557.5 |
542.5 mg/L = 542.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm