5
V. V.
V. V.
V.
Equipment required:Equipment required:
Equipment required:Equipment required:
Equipment required:
• The HI 4013 requires the Hanna HI 5315 Double
junction reference electrode with HI 7078 as external
electrolyte.
• 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
magnetic stirring bars (Note: Isolate beakers from stir-
rer 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 RequiredSolutions Required
Solutions RequiredSolutions Required
Solutions Required
Standards for Nitrate Measurements
0.1 M sodium nitrate standard, 500 mL HI 4013-01
100 ppm nitrate standard, 500 mL HI 4013-02
1000 ppm nitrate standard, 500 mL HI 4013-03
Ionic Strength Adjuster
ISA, 500 mL HI 4013-00
Using volumetric pipettes and glassware make dilutions to
bracket the concentration of the samples. Store samples in
plastic bottles. Standards with concentrations < 10
-3
M
should be prepared daily.
Two mL of Hanna ISA HI 4013-00 should be added to 100
mL sample or standard.
ISISA is Interferent suppressent ISA. Dissolve 17.32g
Al
2
(S0
4
)
3
.H
2
0, 3.43.g Ag
2
SO
4
, 1.28g H
3
BO
4
, 2.52g
H
2
NSO
3
H in approximately 800 mL deionized water. Adjust
pH to 3 with 0.1 N NaOH. Dilute to 1 liter. Store in a dark
colored container.
50 mL of ISISA should be added to each 50 mL sample or
standard.
VIIVII
VIIVII
VII.
General GuidelinesGeneral Guidelines
General GuidelinesGeneral Guidelines
General Guidelines
• Ensure the o-ring is installed on modules before screw-
ing into the sensor handle or inner stem.
