Hanna-instruments HI 9321 Manual do Utilizador descarregar pdf (Página 23)

High concentrations of sodium ions interfere with readings in alkaline

solutions. The pH at which the interference starts to be significant

depends upon the composition of the glass. This interference is the

alkaline error and causes the pH to be underestimated. Hanna's

glass formulations have the indicated characteristics.

Sodium Ion Correction for the Glass at 20-25°C

Concentration pH Error

0.1 Mol L

-1

13.00 0.10

13.50 0.14

14.00 0.20

1.0 Mol L

-1

12.50 0.10

13.00 0.18

13.50 0.29

14.00 0.40

Alkaline Error

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 35 36

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Hanna-instruments HI 9321 Manual do Utilizador Página 23