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What type of Chemical Reagent should you choose for Water Tests?

Written by Janice M on . Posted in Technical Tips

Five different forms of chemical reagents are generally available for professional water quality tests.

General Guidelines:

  • For the most accurate results, tablet reagents are the best form of reagent. Lovibond tablets have a guaranteed shelf life of 5 or 10 years. Each tablet is sealed in foil, eliminating the possibility of indicator aging. Tablets also have greater accuracy in terms of their manufacture – the amount of reagent contained in each tablet is extremely accurately dosed when compared with powder reagents. However, the disadvantage is that they need to be crushed with a rod before use. For example, DPD tablets.
  • Powder reagents are more convenient to use, as they do not require crushing. However, they are often less accurate than tablets and the packaging can also create more litter.
  • DPD Powder Pop Reagent Dispenser – this is ideal for bulk testing. Companies that do bulk tests (100 – 1000) find it reduces the need for opening individual packages and provides high reproducibility.
  • Liquid reagents are best to use when more complex mixes of reagents are to be used, eg. Chemical Oxygen Demand (COD) vials.
  • Tube tests make measurement of more complex tests easier and more accurate, as the chemicals are already precisely mixed, eg COD (Chemical Oxygen Demand), Nitrates. However, they are expensive.

If you still not sure which is best for the tests you are doing, phone our technical sales department at +27 (0)11 475 8565.

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