Thermo Scientific Orion DUAL STAR User Manual page 73

7 . Use the numeric keypad and decimal key to enter the concentration of the
standard and press the f2 (accept) key .
8 . 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 ) sample is to be subtracted by the addition of silver (Ag
-2
are required to subtract each sulfide ion and the reaction ratio is 0 .5 .
9 . 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 .
10 . Wait for the reading to stabilize . When the reading is stable, press the
f2 (yes) key .
11 . Use the numeric keypad and decimal key to enter the volume of the first
increment of standard, in mL, to be added to the sample and press the
f2 (accept) key .
12 . Add the first increment of standard to the sample and press the f2 (yes) key .
13 . Wait for the reading to stabilize . When the reading is stable, press the
f2 (yes) key .
14 . Use the numeric keypad and decimal key to enter the volume of the second
increment of standard, in mL, to be added to the sample and press the
f2 (accept) key .
15 . Add the second increment of standard to the sample and press the
f2 (yes) key .
16 . Wait for the reading to stabilize . When the reading is stable, press the
f2 (yes) key .
Thermo Scientific Orion DUAL STAR pH/ISE Meter User Guide
™
Incremental Techniques
), two silver ions
+