Reflectoquant® pH 1.0-5.0 Test, Catalog No. 16894/1
The pH value of dilute aqueous solutions is defined as the negative logarithm
of the hydrogen ion concentration expressed in molarity:
pH = -lg (H* concentration)
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 evaluated
3. Measuring Range and Number of Determinations
||Number of Determinations
|pH 1.0 - 5.0
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
2 Bar code strips
Titristar® Buffer solution ready for use, pH 2.00, Cat. No. BX1652
Titristar® Buffer solution ready for use, pH 4.00, Cat. No. BX1634
Extract solid samples by an appropriate method.
The measurement with this pH test can be performed only with the reflectometers
RQflex 2 and RQflex plus.
Observe the manual for the reflectometer. The following applied to this pH test:
Measurement Procedure A
Stored reaction time: 15 sec
- Remove 1 analytical test strip and immediately
reclose the tube.
- Press START button of the reflectometer and - this is imperative -
at the same time immerse both reaction zones of the test
strip in the measurement solution (15-25°C) for approximately 2 sec.
- Vigorously 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.
If another Reflectoquant® test was used prior to this pH determination,
the strip adapter should be cleansed thoroughly with water or ethanol.
Cleaning is also necessary at the end of each workday.
8. Method Control
To check analytical test strips, equipment and
Analyze one of the above-mentioned buffer solution (approximately
20°C) as described in section 7.