Techmark

Performance
Measuring Range	3 to 20 mg/l
Sampling Hours	3 minutes
Detecting Limit	0.5 mg/l
Color 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
Substance	Concentration	Interference	Change color by itself
CN-	10 mg/l or higher	Plus error	No stain at 100 mg/l or lower
Fe2+	1 mg/l or higher	Plus error	Reddish purple at 3 mg/l or higher
Fe3+	2 mg/l or higher	Plus error	No stain by 100 mg/l
Cu	0.1 mg/l or higher	Plus error	Reddish purple at 0.1 mg/l or higher
Mn	0.5 mg/l or higher	Plus error	Purple stain in upper part of the reagent at 3 mg/l or higher
Pb	0.5 mg/l or higher	Plus error	No stain at 100 mg/l
Ni	2 mg/l or higher	Plus error	Discolors purple stain to whole layer at 2 mg/l or higher


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