4
5
d
IV. Design elements of the FC300 electrodes
Design elements of the FC300 electrodes
Design elements of the FC300 electrodes
Design elements of the FC300 electrodes
Design elements of the FC300 electrodes
rrrrreproduc-
ible potential.
V.
V.
V.
V.
V. Equipment required
Equipment required
Equipment required
Equipment required
Equipment required:
•
Hanna FC300 combination electrode with HI 7079 fill
solution.
•
Hanna 931100 portable waterproof Sodium meter
that reads out in units of g/L NaCl.
•
Hanna 931101 portable waterproof Sodium meter
that reads out in units of mg/L, g/L Na
+
,pNa
•
Hanna 931102 portable waterproof Sodium meter
that reads out in units of g/L or % NaCl
•
Hanna HI 4222 pH/ISE/mV meter or other suitable
ion or pH/mV meter. (Note: log/linear graph paper is
useful if an ISE (ion) meter is not available.
•
Hanna HI 180 magnetic stirrer or equivalent with
stirring bars (HI 731320). (Note: isolate beakers from
stirrer motor heat by placing insulating material such
as foam or cork between them).
•
Hanna HI 76404 electrode holder or equivalent.
•
Plastic beakers (HI 740036P) or other suitable mea-
surement vessel.
VI.
VI.
VI.
VI.
VI. Solutions Required
Solutions Required
Solutions Required
Solutions Required
Solutions Required
Standards for Sodium Measurements
Select appropriate Hanna Instruments standard and ISA
from the list below:
Part number
0,1 M sodium solution
HI 4016-01
10 ppm sodium solution
HI 4016-10
100 ppm sodium solution
HI 4016-02
1000 ppm sodium solution
HI 4016-03
30.0g/L NaCl solution (500mL) HI 7081L
3.0g/L NaCl solution (500mL) HI 7083L
0.3g/L NaCl solution (500mL) HI 7085L
2.3g/L sodium solution (500mL) HI 7080L
0.23 g/L sodium solution (500mL) HI 7087L
Reference Fill Solution (500mL)
HI 7079
ISA (500mL)
HI4016-00
HI7090L
Storage Solution (500mL)
HI 4016-45
Conditioning /Etchant solution HI 4016-46
Using volumetric pipettes and glassware make dilutions of
the standard to bracket the concentration of the samples.
Standards with concentrations less than 10
-3
M (100 ppm)
should be prepared fresh daily. Store solution in a tightly
sealed bottle without ISA added. 10 mL of HI 4016-00 , or
HI7090L should be added to each 100 mL sample of stan-
dard and samples just prior to measurement. This ISA
buffers the pH of the sample or standard to about pH 9.8
thus removing hydrogen ion as an interference. It also
provides samples and standards a constant ionic strength
background that stabilizes the solutions activity coefficient
and permits concentration to be measured directly.
Sodium Selective Membrane
Ceramic junction
HI 7079 Fill Solution
Fill hole