Hanna Instruments HI 4011 User Manual

Page 12

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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

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