Adapting A Buret Titration For Use With A Digital Titrator - Hach DR2400 Manual

Figure 13 Selecting the Best Wavelength

Adapting a Buret Titration for Use With a Digital Titrator

5940022ChemAnal.fm
1.0
400
0.0
Any standard titration procedure that uses a buret can be adapted to the Digital
Titrator by using the following procedure.
1. From Table 12 on page 50, select a titration cartridge having the same active
ingredient as the buret solution.
2. Determine the approximate number of digits required. The Digital Titrator
dispenses 1 mL per 800 digits on the counter. Using the following equation,
determine the digits required for your buret method.
×
N t mL t
Digits Required = -------------------------------------- -
N c
Where:
N = Normality of buret titrant
t
mL = milliliters of buret titrant required for an average titration
t
N = Normality of Digital Titrator cartridge.
c
If the number of digits required is within the range of 70 to 350, you can use the
procedure as written, substituting the Digital Titrator directly for the buret.
Or, if the number of digits is outside of this range, make the following
modifications:
a. If the number of digits required is greater than 350, decrease the sample
size to save titrant.
b. If the number of digits required is less than 70, increase the sample size to
increase precision.
c. If the sample size is altered, adjust the amount of buffering or indicating
reagents by the same proportion.
450 500 550
Wavelength (nm)
×
800
Chemical Analysis
500 505 510 515 520
600 650 700
Chemical Analysis
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