Performance

Measuring Range

3 to 20 mg/L

Sampling Time

3 minutes

Detecting Limit

0.5 mg/L

Colour Change

Pale orange → Reddish purple

Reaction Principle

Zn + Indicator → Reddish purple complexcompound

Shelf Life

3 Years

Corrections for temperature &humidity

Water temperature correction isnecessary

Store the tubes at cool and darkplace.

Possible coexisting substances and theirinterferences (NOTE)

Substance

Concentration

Interference

Change colour by itselfto

CN^-

10 mg/L

+

No (100mg/L)

Fe²⁺

1 mg/L

+

Reddish purple (3mg/L)

Fe³⁺

2 mg/ L

+

No (100mg/L)

^Ni

2 mg/ L

+

Purple(whole layer) (2mg/L)

^Cu

0.1 mg/L

+

Reddish purple (0.1mg/L)

Mn

0.5 mg/L

+

Purple (3mg/L)

Pb

 0.5 mg/L

+

 No (100mg/L)