409.5 mg/L = 409.5 ppm
| mg/L | ppm |
|---|---|
| 394.5 mg/L | 394.5 |
| 399.5 mg/L | 399.5 |
| 404.5 mg/L | 404.5 |
| 409.5 | 409.5 |
| 414.5 mg/L | 414.5 |
| 419.5 mg/L | 419.5 |
| 424.5 mg/L | 424.5 |
409.5 mg/L = 409.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm