Hanna-instruments HI 4003 Manual do Utilizador descarregar pdf (Página 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.

Other Measurement TOther Measurement T

Other Measurement T

echniquesechniques

echniques

Known Addition (for Cd

)

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]

1 2 ... 7 8 9 10 11 12 13 14 15 16

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