13
Procedure:
Follow sections VIII and IX to prepare electrodes for mea-
surement.
1) Follow section VI to prepare standards/ solution. Stan-
dards should bracket and fall within the range of
interest. Standards and solutions should be at the
same temperature.
2) 2 mL of HI 4004-00 is added to 100 mL of both
samples and standards.
Add stir bar and mix before taking measurements.
3) Follow section VII; General Guidelines to optimize test
set-up.
4) During calibration it is best to start with lower concen-
tration samples first. Wait for a stable reading before
reading/ recording values. Permit longer equilibra-
tion times at these levels (3 or 4 minutes).
To prevent carry over and contamination of samples, rinse
sensors with deionized water and remove moisture with
absorbant tissue between samples.
Typical HI 4004 and HI 4104 Linearity
-80
-60
-40
-20
0
20
40
60
80
100
0
1
2
3
4
5
6
-Log of Molar Concentration
mV
