218.5 mg/L = 218.5 ppm
| mg/L | ppm |
|---|---|
| 203.5 mg/L | 203.5 |
| 208.5 mg/L | 208.5 |
| 213.5 mg/L | 213.5 |
| 218.5 | 218.5 |
| 223.5 mg/L | 223.5 |
| 228.5 mg/L | 228.5 |
| 233.5 mg/L | 233.5 |
218.5 mg/L = 218.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm