Independent
confirmation of the outstanding performance of Metrohm's EtOH-Trode for
pH measurement in fuel ethanol: in an evaluation of different combined
glass electrodes by means of an interlaboratory comparison, the Metrohm
EtOH electrode with ground-joint diaphragm excelled by its outstanding
precision. While all the electrodes with aqueous KCl filling solution
and single liquid junction presented equivalent results, only the
Metrohm electrode with its double liquid junction and one other
electrode presented acceptable repeatability limit values.
The comparative evaluation was conducted by
Mary Ane Gonçalves et. al. and
published in Sensors and Actuators B 158
(2011), p. 327-332. The evaluation
refers to the Metrohm EtOH-Trode as «electrode C» and states: «Furthermore,
only the C electrode showed reproducibility limits as low as reported in the US
Standard [ASTM D 6423]. Due to its remarkable precision, the C electrode
presented a good compromise between trueness and precision, since its pH
results were only slightly higher than the results obtained with the A, B and D
electrodes. This makes the C electrode a very good candidate for pH
measurements of fuel ethanol.»
Because the pH
e determination according to ASTM D 6423 and EN
15490 is time-controlled, it is essential that the sensor has a rapid response
time. The Metrohm EtOH-Trode with a special membrane glass and the very precise
fixed ground-joint diaphragm is particularly suitable for measuring the pH
e
values of biofuel.
The comparative evaluation was conducted by Mary Ane Gonçalves et. al. and
published in
Sensors and Actuators B 158
(2011), p. 327-332. The evaluation
refers to the Metrohm EtOH-Trode as «electrode C» and states: «Furthermore,
only the C electrode showed reproducibility limits as low as reported in the US
Standard [ASTM D 6423]. Due to its remarkable precision, the C electrode
presented a good compromise between trueness and precision, since its pH
results were only slightly higher than the results obtained with the A, B and D
electrodes. This makes the C electrode a very good candidate for pH
measurements of fuel ethanol.»
Because the pH
e determination according to ASTM D 6423 and EN
15490 is time-controlled, it is essential that the sensor has a rapid response
time. The
Metrohm EtOH-Trode with a special membrane glass and the very precise
fixed ground-joint diaphragm is particularly suitable for measuring the pH
e
values of biofuel.
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