Hanna Instruments HI 4011 - Manual (Page 12)

12
Procedure
1) Follow sections VIII and IX to prepare sensors for
measurement.
2) Follow section VI to prepare standards / solution.
Standards should bracket and fall within the range of
interest.
Two mL HI 4000-00 ISA 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 measurement
before recording values. Slightly longer equilibra-
tions are required at lower concentrations .
5) To prevent carry over and contamination of samples,
rinse sensors with deionized water and dab dry be-
tween samples.
Typical Linearity of the HI 4011 or HI 4111 Iodide ISE's
-400
-350
-300
-250
-200
-150
-100
-50
0
50
0 1 2 3 4 5 6 7
-log of concentration
mV