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The HI-749-25 are the replacement reagents for the HI-749 Chromium VI Low Range Checker® HC.

£17.40 (exc.VAT)
£20.88 (tax incl.)
Full Description Specification

These high-quality reagents are clearly marked with the lot number and expiry date on each packet for traceability.

The HI-749-25 are high-quality reagents that are pre-measured, allowing for users to achieve fast and accurate measurements with their Chromium VI Low Range Checker® HC. These reagents follow the Diphenylcarbohydrazide Method in which the reaction between chromium VI and the reagent causes a purple tint in the sample. By simply adding the packet of HI-749-25 reagent to the sample, the reaction will take place and the HI-749 will determine the concentration from the colour that is produced. The results will be displayed in ppb of chromium VI. These reagents are designed to be used with samples that have an expected range of 0 to 300 ppb chromium VI.

Tip for an accurate measurement

It is important that the sample does not contain any debris.

Whenever the cuvette is placed into the measurement cell, it must be dry outside and completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI-731318 or a lint-free cloth prior to insertion.

Shaking the cuvette can generate bubbles, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette.

Do not let the reacted sample stand for too long after reagent is added, or accuracy will be lost.

After the reading, it is important to discard the sample immediately, otherwise the glass might become permanently stained.

Four steps. One click. Instant Readout.

1. ‘Zero’ the Checker®HC with your vial inside

2. Place a 10ml water sample into the vial and add your reagent

3. Place your vial into your Checker®HC

4. Press the button and read the results

Also available: HI-749-11 calibration set.

Read More

Quantity25 tests
MethodASTM Manual of Water and Environmental Technology, D1687-92 Diphenylcarbohydrazide Method