| Possible
coexisting substances and their interferences |
Substance
|
Concentration
|
Interference |
Change
color by itself |
Ammonia
|
500 ppm
|
No effect
|
No discoloration
up to 500ppm |
Hydrogen chloride
|
300 ppm
|
No effect
|
No discoloration
up to 300ppm |
Chlorine
|
10 ppm
|
No effect
|
No discoloration
up to 5ppm |
Hydrogen cyanide
|
50 ppm
|
No effect |
No discoloration
up to 30ppm |
Sulfur dioxide
|
15 ppm
|
No effect |
No discoloration
up to 15ppm |
Nitrogen dioxide
|
10 ppm
|
No effect |
No discoloration
up to 10 ppm |
Hydrogen sulfide
|
50 ppm
|
No effect |
No discoloration
up to 30 ppm |
