Citizen CBM-910 Type II Instruction Manual Page 86

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Chapter 7 Application Mode
74 HORIBA
Chapter 7 Application Mode
The application mode enables the measurement for the ION standard addition method
and the pharmaceutical water inspection methods under various Pharmacopeias by
conductivity measurement in conformance to specific measurement methods. By simply
submerging the electrode to a sample, the instrument will walk you through the process
and will determine the result. This chapter explains about the settings and procedures of
measurement using the ION standard addition method and the pharmaceutical water
inspection methods under various Pharmacopeias by conductivity measurement.
7.1 Standard Addition Method Mode
7.1.1 Measurement Using Standard Addition Method
The standard addition method is classified as the known addition method and the known
subtraction method. The sample addition method and the sample subtraction method are
available as applied methodology.
These methods are effective when the composition varies depending on the sample and it
is difficult to control conditions such as pH and ionic strength.
In the addition method mode, you can save the measurement results only to a USB
memory. They can also be printed out. If you need to save or print out the data,
"Simultaneously Memory" of "2.6 USB Memory Setting" (P.20) or "Auto Printout" of "2.7
Printer Setting" (P.22) to ON in advance.
Refer to JIS K0122 for standard addition method.
7.1.2 Known Addition Method and Sample Addition Method
Known addition method
For the known addition method, a small amount of standard solution for the target ion
species is added to the sample to increase the concentration of the target ion by a certain
amount. The original ion concentration is obtained from the change in electric potential
when the standard solution is added.
Known addition method (Single)
The standard solution for the target ion species is added only once to the sample
solution.
Known addition method (Double)
The standard solution for the target ion species is added twice to the sample solution.
This mode is used to obtain the electric potential slope of the electrode used.
Sample addition method
For the sample addition method, a small amount of sample is added to the standard
solution for the target ion species, to increase the concentration of the target ion. The
original ion concentration is obtained from the change in electric potential when the
sample is added.
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