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 mL of HI 4013-00 is added to 100 mL of both
samples and standards. OR
• 50 mL of ISISA are added to 50 mL both samples
or standards.
Add stir bar and mix before taking measurements.
2) Follow section VII; General Guidelines to optimize test
set-up.
3) 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 4013 and HI 4113 Linearity
0
50
100
150
200
250
300
01234567
-Log of Molar Concentration
mV
