How to do a Chlorine Residual Test

[@sababhatti2967]

Super insightful! Thanks!!

[@WaterMovement]

Glad you enjoyed it!

[@tomgreene7942]

Thanks, I wondered how the test was done, I don't know why they didn't just show us in class. Can the remaining water and chemical be disposed of in the sanitary sewer or do other disposal methods need to be taken?

[@WaterMovement]

Great question! Our response is a bit lengthy, apologies for that. The disposal of remaining water and chemicals from a chlorine residual test should be done in accordance with safety and environmental regulations. Here are some general guidelines: 1. Neutralization: In many cases, you may need to neutralize the residual chlorine before disposal. This can be done by adding a reducing agent, such as sodium bisulfite or sodium thiosulfate, to the solution. Follow your specific test procedure or laboratory guidelines for the appropriate neutralization method and quantities. 2. Local Regulations: Check local environmental regulations and guidelines for disposing of chemicals and wastewater. Different areas may have specific requirements for the disposal of chlorine and other chemicals. Contact your local environmental agency or municipality for guidance. 3. Hazardous Waste Disposal: If the residual chemicals are considered hazardous waste, they should be disposed of following hazardous waste disposal procedures. Contact your institution's environmental health and safety department or a licensed hazardous waste disposal service for assistance. 4. Dilution: In some cases, you may be able to dilute the solution with a large volume of water to reduce the concentration of chlorine to a safe level before disposal. Again, follow your specific laboratory or test procedure guidelines for the appropriate dilution factor. Always prioritize safety when handling and disposing of chemicals. It's essential to follow established procedures and guidelines to protect yourself, others, and the environment. If you're unsure about the proper disposal method for your specific chlorine residual test, consult with your instructor, lab supervisor, or environmental health and safety department for guidance. Thank you for watching! Please let us know if there’s any specific content you’d like us to produce.

[@mohamedabdulla1589]

Good work, I'm Working power plant Chemist,,

[@WaterMovement]

It's great to hear from another professional in the water treatment field!

[@mohamedabdulla1589]

@WaterMovement 9 years Still going on water Chemistry,

[@amarj9909]

Thanks sir, I am from india , great demonstration can please tell me Chlorometer Details,how to get DPD from online if possible pls share link for those products , Tq sir

[@WaterMovement]

Thank you for the kind words! I'm glad you found the demonstration helpful. For Chlorometer details, they measure chlorine levels in water using DPD (N, N-diethyl-p-phenylenediamine) tablets, which react with chlorine to give a color change. You can find DPD tablets or powder online from suppliers that specialize in water testing equipment. I recommend searching for water testing kits on platforms like Amazon or local suppliers in your region. Unfortunately, I can't provide a direct link, but a quick search for 'DPD tablets for chlorine testing' should bring up many options!

[@Jonasty00]

So question, we do our sample and it reached 8.8+ so we do 5mL sample and then 5mL distilled water, then multiple our result with 2. But let’s say it goes 8.8+ again. Would I do 2.5mL and 7.5mL distilled water, then multiple by 4? And let’s say it still reaches 8.8+. Would I now do 1.25mL sample and 8.75mL distilled, than multiple by 8? We need to settle a debate at work and our water is really yellow

[@WaterMovement]

@@Jonasty00Great question! You’re on the right track with dilutions for high chlorine residuals, and your approach is logical. Here's how it works: 1. First Dilution (5mL sample + 5mL distilled water): If your reading is still 8.8+ after multiplying by 2, this indicates the chlorine residual is still too high for the range of your test. 2. Second Dilution (2.5mL sample + 7.5mL distilled water): If it again reads 8.8+, you’d multiply the result by 4. This is because the dilution factor now is 4 (the sample is 1/4 of the total volume). 3. Third Dilution (1.25mL sample + 8.75mL distilled water): If 8.8+ persists, you’d multiply by 8, as the sample now represents 1/8 of the total volume. Each dilution reduces the concentration by a factor relative to the proportion of your sample to the total volume. Continue this pattern (halving the sample volume and multiplying the result by the corresponding dilution factor) until you get a measurable reading within the range of your test. Pro Tip: If the water is very yellow, it might interfere with the accuracy of the measurement, even with a spectrophotometer. To minimize this, ensure you’re using a proper blank (such as distilled water or a zeroed sample with no chlorine) to account for the yellow tint. This helps the device differentiate between the water's natural color and the reaction caused by chlorine. Let me know if you have more questions!

[@Jonasty00]

@ thank you so much!

[@nicholasortega3153]

Why didnt you use dpd total

[@WaterMovement]

There are different types of DPD (diethyl-p-phenylenediamine) reagents available for chlorine residual testing, such as DPD Total, DPD Free, and DPD Combined. - DPD Total measures both free and combined chlorine residual. - DPD Free measures only free chlorine residual. - DPD Combined measures the difference between the total and free chlorine residuals to determine the combined chlorine residual. Which DPD reagent to use depends on the specific needs of the test being conducted. For example, if you want to determine the total amount of chlorine residual present in a sample, you would use DPD Total. However, if you only want to measure the free chlorine residual, you would use DPD Free. Please keep in mind that the information provided is for educational purposes only and should not be considered professional advice. It is important to always follow your facility's Standard Operating Procedures (SOPs) and guidelines when performing any water treatment procedures. Any actions taken based on the information provided are at your own risk

[@nicholasortega3153]

Ok so would you use dpd free during a chlorine burn ?