Talk about the correct use method of residual chlorine detector

We found that most of the errors in many items in daily water quality testing are not instrumental problems. Many of them are caused by the improper use of analysts during the operation, or the lack of attention to some details of the operation steps. For the testing industry, any mistake in the operation link will have an impact on the final result. For example, the instrument was not calibrated to zero during the detection process, the contamination on the cuvette was not wiped clean, the chemicals were not used correctly during the operation, etc. These operational issues can affect the results of water quality testing. We will introduce you how to use the water quality detector one after another. Today, I will explain to you the correct use of the residual chlorine detector. Residual chlorine is a kind of chlorine ion substance produced after water disinfection, most of which appear in drinking water. Therefore, the residual chlorine detector is also one of the commonly used water quality measurement equipment. Preparation before using the instrument 1. Prepare quantitative bag or bottle of DPD residual chlorine reagent. 2. Laboratory first grade pure water. 3. Take a good test water sample. 4. Colorimetric bottle 5. Residual chlorine detector 6. Other commonly used laboratory equipment. Operation of residual chlorine detector 1. Slowly pour the prepared laboratory first-grade pure water into the colorimetric bottle, and take the amount at the 10mL scale. 2. Use a soft cloth or lint-free soft paper to wipe off the water stains, sweat stains, oil stains, dust and other pollutants on the outer bottle of the colorimetric bottle, so as to avoid the above substances from interfering with the final test result of residual chlorine. 3. Open the shading cover on the residual chlorine detector, align the white triangle symbol on the colorimetric bottle with the triangle symbol on the colorimetric cell, slowly put it in, and cover the shading cover after confirming the position. 4. Operate the instrument keys, move the cursor to 'Zero Calibration' on the screen, press the 'OK' key, and wait for the end of the detector calibration. 5. Slowly pour the treated water sample into the colorimeter, and take the amount at the 10mL scale. 6. Add the DPD residual chlorine reagent into the colorimetric bottle. If it is a bottled reagent, take 1 level scoop, then shake the colorimetric bottle to dissolve the drug evenly. 7. After the colorimetric bottle is left to stand for 30 seconds, wipe the bottle wall with the provided soft cloth or lint-free paper. Align the number with the triangle symbol on the cuvette, then slowly put the cuvette into the cuvette. 8. Move the cursor to 'Test', press the 'OK' button to wait for the final test result, after the residual chlorine test result comes out, you can choose 'Print' and press 'OK' to print. Notes 1. Before and after detection or zero calibration, the colorimetric bottle should be rinsed clean first to avoid interference to the inner wall of the bottle caused by residual chlorine detection. 2. When taking pure water for zero calibration or taking water samples for testing, the water volume should not be less than 10mL. 3. The residual chlorine agent should be poured vertically into the liquid surface of the water sample in the bottle, and must not slide down the inner wall into the water sample. The above is the correct use method and steps of the residual chlorine detector.
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