Thermo orion 410Aplus, Instruction Manual

Page: 43 / 129

Benchtop pH/ISE Meter Instruction Manual
Special Features 42
Electrode interferences should be at a minimum, the effect of the
interference may change as the concentration of the ion of interest changes.
This situation may also result in high or low electrode slopes. It is possible
to reduce some electrode interferences. Consult the appropriate electrode
instruction manual for specific information.
Single Known Addition Measurement Procedure
A standard of known concentration is added to a sample of unknown
concentration. Total concentration should approximately double upon the
addition of the standard, therefore sample concentration should be known
within an order of magnitude.
See the following table to choose the correct standard concentration and
volume of addition.
Milliliters of standard Standard should be
to be added per 100 X times expected
mL of sample sample concentration
1 mL 100X
5 mL 20X
10 mL 10X