Thermo Scientific Orion DUAL STAR User Manual page 70

Incremental Techniques
5 . Use the numeric keypad, decimal key and +/- key to enter the electrode
slope and press the f2 (accept) key . Determine the electrode slope as
directed in the electrode user guide or use the theoretical slope from the table
in the Electrode ID and Slope for Incremental Techniques section .
6 . Use the numeric keypad and decimal key to enter the sample volume, in mL,
and press the f2 (accept) key .
7 . Use the numeric keypad and decimal key to enter the total volume, in mL,
and press the f2 (accept) key . The total volume includes the sample volume,
ISA volume and diluting agent volume, but not the standard volume .
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 ) 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 .
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 .

Thermo Scientific Orion DUAL STAR
), two silver ions
+
pH/ISE Meter User Guide
™