VladVenger
New Member
- Joined
- Feb 5, 2017
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I have a question about how best to use it.
When you have let the colour develop and you compare it with the colour chart how do you do it?
Do you press the test tube against the white part so it touches, or hold it a few mm back so light can get behind too?
If I press it against the chart so there is contact the colour is darker than if i hold it very close but not touching. Due to this I do not know what reading to take it's either 30ppm nitrate or 40ppm (tap water) or 0.25ppm ammonia or 0.50ppm.
Please help.
When you have let the colour develop and you compare it with the colour chart how do you do it?
Do you press the test tube against the white part so it touches, or hold it a few mm back so light can get behind too?
If I press it against the chart so there is contact the colour is darker than if i hold it very close but not touching. Due to this I do not know what reading to take it's either 30ppm nitrate or 40ppm (tap water) or 0.25ppm ammonia or 0.50ppm.
Please help.