Hanna Instruments HI 4003 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 and dab dry with
absorbant laboratory tissue between samples.

XII.

XII.

XII.

XII.

XII. Other Measurement T

Other Measurement T

Other Measurement T

Other Measurement T

Other Measurement Techniques

echniques

echniques

echniques

echniques

Known Addition (for Cd

2+

)

An unknown concentration can be determined by adding a
known amount (volume and concentration) of measured
ion to a known volume of the sample. A mV value is taken
before and after the addition of standard, and using the
equation provided, the unknown concentration is found.

Typical Linearity of HI 4003 and HI 4103 Cadmium Sensors

-280

-260

-240

-220

-200

-180

-160

-140

-120

-100

1.0

2.0

3.0

4.0

5.0

6.0

7.0

-LOG [M]

mV

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