Zinc Ion |
NO.285 |
| Zn |  |
 |
Performance
| Measuring Range | 3 to 20 mg/L |
| Sampling Time | 3 minutes |
| Detecting Limit | 0.5 mg/L |
| Colour Change | Pale orange → Reddish purple |
| Reaction Principle | Zn + Indicator → Reddish purple complex compound |
| Shelf Life | 3 Years |
| Corrections for temperature & humidity | Water temperature correction is necessary |
| Store the tubes at cool and dark place. | |
Possible coexisting substances and their interferences (NOTE)
| Substance | Concentration | Interference | Change colour by itself to |
| CN- | 10 mg/L | + | No ( 100mg/L) |
| Fe2+ | 1 mg/L | + | Reddish purple ( 3mg/L) |
| Fe3+ | 2 mg/ L | + | No ( 100mg/L) |
| Ni | 2 mg/L | + | Purple(whole layer) ( 2mg/L) |
| Cu | 0.1 mg/L | + | Reddish purple ( 0.1mg/L) |
| Mn | 0.5 mg/L | + | Purple ( 3mg/L) |
| Pb | 0.5 mg/L | + | No ( 100mg/L) |
