K-4605 Formaldehyde

Dissolved Formaldehyde Testing Visual Kit

Measure formaldehyde 0-1 ppm & 1-10 ppm

Formaldehyde Information


The K-4605 CHEMets Visual Kit is visual indicator kit for measuring formaldehyde in water levels from 0-1 and 1-10 ppm.  This device uses the Purpald Method for testing. Purpald® is subject to fewer interferences than Schiff's reagent or chromotropic acid procedures. A purple-colored complex is formed when Purpald in alkaline solution reacts with formaldehyde. Results are expressed as ppm (mg/L) CH2O.

Shelf-life of the Purpald Reagent: five months. We recommend stocking quantities that will be used within four months.

The refill kit R-4605 can be purchased for more tests.


What's included:

  • Low Range Comparator (0-2 ppm)
  • High Range Comparator (0-10 ppm)
  • Ampoules (30 tests)
  • Activator Solutions
  • 25 mL sample cup
  • Instruction manual


How to use the K-4605:

Instructions for Ozone water testing using the K-7404



  1. Fill the sample cup with 20 mL of sample water.Fill the sample cup to 25ml
  2. Add 6 drops of A-4201 Activator Solution, and stir gently
  3. Add 4 drops of A-4202 Activator Solution, and stir gently
  4. Snap the end/tip of the ampoule in the water on the bottom/side of the 25 mL sample cup.Snap the tip of the ampoule on the bottom and side of the sample cup
  5. Mix the contents of the ampule by tipping back and forth a few times.Tip the vacu-vial back and forth to mix
  6. Dry the ampoule and wait 12 minutes for color development.Dry vacu-vial and then insert into the I-2019
  7. Obtain the test result by matching to the corresponding color comparator.
  8. For the low range comparator: Place the ampoule, flat end first, into the comparator.  Hold the comparator up towards a light source and view from the bottom. Rotate the comparator until the best color match is found.



K-4605 Instructions

Purpald Tech Sheet

Formaldehyde Information


More Information
Manufacturer CHEMetrics
Call For Price No
Gas Formaldehyde (CH2O)
4-20 mA Output No
Voltage Output None
Power Requirements None
Datalogging No
Warranty 1 Year
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