Thermo Scientific Orion Dual Star User Manual page 57

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8. Use the numeric keypad and decimal key to enter the concentration of the standard and
press the f2 (accept) key.
9. Use the numeric keypad and decimal key to enter the reaction ratio of sample to standard
and press the f2 (accept) key. For example, if a sulfide (S
the addition of silver (Ag
reaction ratio is 0.5.
10. Rinse the electrode (ATC probe, stirrer probe and reference electrode, if applicable) with
distilled water, blot dry with a lint-free tissue and place the electrode(s) into the sample.
When the electrode and sample are ready, press the f2 (next) key.
11. Wait for the reading to stabilize. When the reading is stable, press the f2 (yes) key.
12. Use the numeric keypad and decimal key to enter the volume of the standard, in mL, to be
added to the sample and press the f2 (accept) key.
13. Add the standard to the sample and press the f2 (yes) key.
14. Wait for the reading to stabilize. When the reading is stable, press the f2 (yes) key.
15. The meter will display the result of the single known subtraction. Press the f3 (log/print) key
to save and end the single known subtraction, export the data to the data log and export the
data to a printer or computer, if a printer or computer is connected to the meter and enabled
in the setup menu.
Note: Press the f1 (escape) key to return to the measurement mode without saving the single
known subtraction.
16. Press the f2 (next) key.
17. To perform a single known subtraction using the values that were entered for the previous
single known subtraction, press the f2 (yes) key. To perform a single known subtraction and
enter new values, press the f3 (no) key. To end the incremental technique and return to the
measurement mode, press the f1 (escape) key.
), two silver ions are required to subtract each sulfide ion and the
+
Orion Dual Star pH/ISE Benchtop Meter User Manual
Incremental Techniques
) sample is to be subtracted by
-2
Section 6
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