Reflectoquant® pH 4.0-9.0 Test, Catalog No. 16996/1
The pH value of a dilute solution is defined as
the negative logarithm of hydrogen ion concentration expressed in
pH = – lg (concentration H+
Solutions are characterized as acidic,
neutral or alkaline according to their pH:
pH indicators chemically bound to the test zones
(“nonbleeding” pH indicators) change their color depending on
the pH value of the solution being analyzed. This change in color is
3. Measuring Range and Number of Determinations
||Number of Determinations
|pH 4.0 - 9.0
5. Reagents and Auxiliaries
The analytic test strips are stable at
least up to the date stated on the pack when stored in closed tube
at +15 to +25°·C.
Tube containing 50 analytical test strips
Bar code strips
Titristar® Buffer solution; pH 7.00, Cat. No. BX1632
Extract solid samples by an appropriate method.
· Observe the instructions for the RQflex
The following applies to the pH test:
Measurement Procedure A. Stored reaction
time: 10 sec.
- Remove 1 analytical test strip and immediately
reclose the tube.
- Press START button of the reflectometer and
at the same time immerse both reaction zones of the test
strip in the sample solution (15-30°C) for approx. 2 sec.
- Shake off excess liquid from the test strip
- As soon as the beeper sounds (5 sec. before
end of reaction time), insert the test strip all the way into the
strip adapter with the reaction zones facing the display.
- Read off the result from the display. The
result is automatically stored.
At the end of each workday, cleanse the strip
adapter thoroughly with water or ethanol.
8. Method Control
To check analytical test strips, equipment and
Analyze above-mentioned buffer solution (approx
20°C) as described in section 7.