TEST CONCENTRATION NaOCL, HTH, NaDCC, bleach (WataTest) 50ml

STD CWATTESTAWN

Valid Article

Former Code(s): CWATZNL0380 CWATZNL0435 CWATTESTAW1 CWATTESTRA1 CWATTESTQQQ CWATTESTAWCS CWATZFR0618 CWATTESTAW- CWATZBE1107
OC subscriptions: included in supply or field order tools (e.g. UniField)
SC subscriptions: included in supply or field tools
OC validations: approved for procurement and use by an OC for international or local orders specifying context and activity in Medical Standard Lists (MSL)

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TEST CONCENTRATION NaOCL, HTH, NaDCC, bleach (WataTest) 50ml

Definition

Test to determine the concentration of active chlorine in solutions (Cl , HOCl, OCl-) in grams per litre, ranging between 1 to 7 g/l (0.1 to 0.7% active chlorine and 0.32 to 2.23 °Cl). Measurement accuracy is ± 0.5 g/l.

The WataTest® reagent can measure concentration of chlorine solutions made from different solutions such as NaDCC, HTH, bleaching powder and bleach.

Specifications

The WataTest® test set contains:

  • a 50 ml bottle of WataTest™ reagent
  • a 20 ml measuring spoon
  • a 3 ml pipette
  • a 1 ml syringe
  • an user manual
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Instructions for use

The ideal result should be around 6 g/l, maximum 7g/l. If you obtain a different concentration, make sure you adjust the dilution of the solution.

Always use a clean, dry syringe to collect the WataTest® reagent!

Steps for testing:

  • thoroughly mix the concentrated solution to be tested
  • using the plastic pipette, collect exactly 2 ml of the concentrated solution, and place that amount in a dosing spoon, or the small container with a white base
  • shake the bottle of the WataTest® reagent
  • fill the syringe with the WataTest® reagent and be ready to count the number of drops that will be used
  • holding the syringe vertically, let the WataTest® reagent fall one drop at a time into the dosing spoon or the small container with a white base and count the number of drops added while gently shaking until the solution changes colour permanently
  • divide the number of drops by 2 to obtain the concentration in grams per litre (e.g. : 12 drops = 6 g/l)
  • shake gently after adding each drop; if the solution in the dosing spoon or small container turns light-coloured again, add one more drop, repeating until the colour change no longer reverses

For information on chlorination and chlorine generating products, see "Public Health Engineering in Precarious Situations", MSF, 2nd edition, 2010:

  • T.B. 2.19 Chlorine-generating products
  • T.B. 2.21 Batch chlorination of drinking water
  • T.B. 2.22 Monitoring chlorination

Storage

  • store the WataTest® reagent away from light and at room temperature (approximately 25°C)
  • carefully close the reagent bottle after each use in order to prevent the liquid from oxidising
  • do not exceed the expiration date shown on the WataTest® bottle label

Waste management

Contact your WatSan or Environmental Health technical referent for disposal of expired WataTest® reagents.

Make sure local regulations are followed for disposal.

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