|
|
| Chromium (VI) Ion |
Cr6+ |
NO.273 |
| Performance |
Measuring
Range
|
0.5 to 50 mg/l |
Sampling Hours
|
2 minutes |
Detecting Limit
|
0.4 mg/l |
Color Change
|
White --->
Yellow |
| Reaction
Principle |
Cr6+ + Pb(CH3COO)2 --->
PbCrO4 |
| 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 |
Substance
|
Concentration
|
Interference |
Change
color by itself |
Chloride ion
|
20mg/l or lower
|
Plus error
|
No |
Acetic acid ion
|
20 mg/l or higher
|
Plus error
|
No |
Nitric acid ion
|
30 mg/ or lower
|
Plus error
|
No |
Sulfide ion
|
0.5 mg/l or higher
|
Plus error |
Brown |
Sulfuric acid ion
|
10 mg/l or higher
|
Plus error |
No |
Phosphoric acid ion
|
5 mg/l or higher
|
Plus error |
No |
|
