121.5 mg/L = 121.5 ppm
| mg/L | ppm |
|---|---|
| 106.5 mg/L | 106.5 |
| 111.5 mg/L | 111.5 |
| 116.5 mg/L | 116.5 |
| 121.5 | 121.5 |
| 126.5 mg/L | 126.5 |
| 131.5 mg/L | 131.5 |
| 136.5 mg/L | 136.5 |
121.5 mg/L = 121.5 ppm
1 ppm = 1 mg/L (aqueous, density ≈ 1 kg/L) · 1 ppb = 0.001 mg/L · 1% = 10,000 ppm