Harvey Sen water quality detection iodine reagent iodine contentDetermination of iodine residues in drinking water, hospital wastewater, industrial wastewater, and other water treated with iodine containing disinfectants.

Technical principles

Harvey Sen water quality testing iodine reagent iodine content determinationBased on the national standard GB/5750.11-2006 DPD method principle, react with DPD reagent to make the solution red. Measure the absorbance value of the color developing solution at the test wavelength to obtain the iodine content in the water sample. Within a certain concentration range, the absorbance value is proportional to the iodine content in the water sample.

measuring range

Testing precautions

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. If the iodine concentration in the water sample is too high, there will be a phenomenon in step 2 where the color turns pink and then fades back to colorless. In this case, it is recommended to dilute it appropriately before testing;

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