According to relevant national standards, qualified tap water should contain a certain amount of residual chlorine, but excessive residual chlorine content can increase the odor of water and also bring some harmful by-products (such as chloroform). To eliminate the tedious operation of preparing reagents and testing processes for users, and improve detection efficiency, based on the GB 5750.11-2006 standard, this product has been launchedHigh range residual chlorine/total chlorine water quality detection reagent.

High range residual chlorine/total chlorine water quality detection reagentBased on the N, N-diethyl-phenylenediamine (DPD) method (GB 5750.11-2006). DPD reagent reacts rapidly with free residual chlorine in water to produce a red color, and the color depth is proportional to the content of free residual chlorine in water.

measuring range

matters needing attention

1. For more accurate testing, the blank value of the reagent should be measured every 3 months. The determination of reagent blank is also carried out according to the testing steps, except that the sample is replaced with pure water for testing. Subtract the blank value of the reagent from the final test result;

2. If the content is higher than the reagent range, the measured value can only be used to estimate the dilution factor and cannot be used as a test result. After diluting the sample, retest;

3. This reagent is a white or light gray powder. If the reagent clumps or turns black, please stop using it and contact the manufacturer;

4. The pH value of the water sample to be tested is 5.0-8.0;

5. The color development solution is unstable, and the test should be completed within 1 minute after the color development is completed, otherwise the test results will be inaccurate;

6. The triangular positioning mark on the colorimetric tube should be aligned with the positioning mark on the instrument during zeroing and reading;

7. If the residual chlorine concentration in the water sample is too high, a phenomenon of appearing pink and then fading to colorless will occur in step 2. In this case, it is recommended to dilute it appropriately before testing;

8. Store in a dry, cool place, out of reach of children. Do not store with food, medicine, etc., and do not put into fire.