Same tube in both pics for nitrate water testing - do I go by the color with the tube pressed against the paper, or held away from the paper? I'm so confused
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0-2700 ppm Nitrate Comparator (C-6909C) | CHEMetrics
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A colorimetric method for use within portable test kits for nitrate determination in various water matrices - Analytical Methods (RSC Publishing)
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Same tube in both pics for nitrate water testing - do I go by the color with the tube pressed against the paper, or held away from the paper? I'm so confused
Detection methods of nitrate in water: A review - ScienceDirect
Water Analysis Test Strips - Labtek Services Ltd
JBL - ProAquaTest NO3 - Nitrates test in water
Nitrate Reduction Test - Principle, Procedure, Uses and Interpretation
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