Hanna Instruments Canada
The Hanna Advantage: A Worldwide Leader in Technology and Innovation 100% Quality  360 Value
Contact Hanna: (800) 842-6629
Hanna Instruments Canada
Customer Support: (800) 842-6629

Free Chlorine Test Kit Replacement Reagents (50 tests) - HI3831F-050


In stock

The HI3831F-050 are replacement reagents for the colorimetric determination of free chlorine with the HI3831F Free Chlorine Test Kit. There are enough reagents for approximately 50 tests to be used with Hanna’s test kit. These high quality reagents are manufactured in our state-of-the-art facility and are clearly marked with the lot number and expiration date on each packet for traceability.

  • Pre-made reagents for ease of use
  • Prepared with high purity chemicals
  • Marked with expiration date and lot number for traceability


The HI3831F-050 are high quality reagents that are pre-measured, allowing for users to achieve fast and accurate free chlorine measurements with the chemical test kit. These reagents follow the DPD (N, N-diethyl-p-phenylenediamine) method to determine free chlorine concentration.

For determination of free chlorine, the sample is first adjusted to a pH near 6.3. When the DPD reagent is added to a sample containing chlorine, the reagent is immediately oxidized. The reaction between chlorine and the reagent causes a red colored complex to form; the greater the concentration, the deeper the color. A color comparator cube is included for an accurate, side-by-side, visual analysis to determine free chlorine concentration. These reagents are designed to be used with samples that have an expected free chlorine range of 0.0 to 2.5 mg/L (ppm) Cl2.

Additional information

Weight 0.11 kg



SKU HI3831F-050
Name Free Chlorine Test Kit Replacement Reagents (50 tests) – HI3831F-050
Package bottles
Quantity 50 tests
Method DPD


Free Chlorine Test Kit Replacement Reagents (50 tests) – HI3831F-050